-
Notifications
You must be signed in to change notification settings - Fork 1.6k
/
Copy pathAttribute.xml
2978 lines (2744 loc) · 246 KB
/
Attribute.xml
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
<Type Name="Attribute" FullName="System.Attribute">
<TypeSignature Language="C#" Value="public abstract class Attribute" FrameworkAlternate="dotnet-uwp-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netstandard-1.0;netstandard-1.1;netstandard-1.2;netstandard-1.3;netstandard-1.4;netstandard-1.5;netstandard-1.6;netstandard-2.0;netstandard-2.1" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi abstract beforefieldinit Attribute extends System.Object" FrameworkAlternate="dotnet-uwp-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netstandard-1.0;netstandard-1.1;netstandard-1.2;netstandard-1.3;netstandard-1.4;netstandard-1.5;netstandard-1.6;netstandard-2.0;netstandard-2.1" />
<TypeSignature Language="DocId" Value="T:System.Attribute" />
<TypeSignature Language="VB.NET" Value="Public MustInherit Class Attribute" FrameworkAlternate="dotnet-uwp-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netstandard-1.0;netstandard-1.1;netstandard-1.2;netstandard-1.3;netstandard-1.4;netstandard-1.5;netstandard-1.6;netstandard-2.0;netstandard-2.1" />
<TypeSignature Language="F#" Value="type Attribute = class" FrameworkAlternate="dotnet-uwp-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netstandard-1.0;netstandard-1.1;netstandard-1.2;netstandard-1.3;netstandard-1.4;netstandard-1.5;netstandard-1.6;netstandard-2.0;netstandard-2.1" />
<TypeSignature Language="C++ CLI" Value="public ref class Attribute abstract" FrameworkAlternate="dotnet-uwp-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netstandard-1.0;netstandard-1.1;netstandard-1.2;netstandard-1.3;netstandard-1.4;netstandard-1.5;netstandard-1.6;netstandard-2.0;netstandard-2.1" />
<TypeSignature Language="C#" Value="public abstract class Attribute : System.Runtime.InteropServices._Attribute" FrameworkAlternate="netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi abstract serializable beforefieldinit Attribute extends System.Object implements class System.Runtime.InteropServices._Attribute" FrameworkAlternate="netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1" />
<TypeSignature Language="VB.NET" Value="Public MustInherit Class Attribute
Implements _Attribute" FrameworkAlternate="netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1" />
<TypeSignature Language="F#" Value="type Attribute = class
 interface _Attribute" FrameworkAlternate="netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1" />
<TypeSignature Language="C++ CLI" Value="public ref class Attribute abstract : System::Runtime::InteropServices::_Attribute" FrameworkAlternate="netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1" />
<AssemblyInfo>
<AssemblyName>System.Runtime</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.10.0</AssemblyVersion>
<AssemblyVersion>4.0.20.0</AssemblyVersion>
<AssemblyVersion>4.1.0.0</AssemblyVersion>
<AssemblyVersion>4.2.0.0</AssemblyVersion>
<AssemblyVersion>4.2.1.0</AssemblyVersion>
<AssemblyVersion>4.2.2.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>mscorlib</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<TypeForwardingChain>
<TypeForwarding From="mscorlib" FromVersion="4.0.0.0" To="System.Runtime" ToVersion="0.0.0.0" FrameworkAlternate="dotnet-uwp-10.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Runtime" ToVersion="5.0.0.0" FrameworkAlternate="net-5.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Runtime" ToVersion="6.0.0.0" FrameworkAlternate="net-6.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Runtime" ToVersion="7.0.0.0" FrameworkAlternate="net-7.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Runtime" ToVersion="8.0.0.0" FrameworkAlternate="net-8.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Runtime" ToVersion="9.0.0.0" FrameworkAlternate="net-9.0" />
<TypeForwarding From="System.Runtime" FromVersion="4.1.1.1" To="mscorlib" ToVersion="4.0.0.0" FrameworkAlternate="netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1" />
</TypeForwardingChain>
<Base>
<BaseTypeName>System.Object</BaseTypeName>
</Base>
<Interfaces>
<Interface FrameworkAlternate="netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1">
<InterfaceName>System.Runtime.InteropServices._Attribute</InterfaceName>
</Interface>
</Interfaces>
<Attributes>
<Attribute>
<AttributeName Language="C#">[System.AttributeUsage(System.AttributeTargets.All, AllowMultiple=false, Inherited=true)]</AttributeName>
<AttributeName Language="F#">[<System.AttributeUsage(System.AttributeTargets.All, AllowMultiple=false, Inherited=true)>]</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="net-8.0;net-9.0">
<AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(0)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.CompilerServices.Nullable(0)>]</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="net-8.0;net-9.0">
<AttributeName Language="C#">[System.Runtime.CompilerServices.NullableContext(1)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.CompilerServices.NullableContext(1)>]</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1">
<AttributeName Language="C#">[System.Runtime.InteropServices.ClassInterface(System.Runtime.InteropServices.ClassInterfaceType.None)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.InteropServices.ClassInterface(System.Runtime.InteropServices.ClassInterfaceType.None)>]</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1">
<AttributeName Language="C#">[System.Serializable]</AttributeName>
<AttributeName Language="F#">[<System.Serializable>]</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1">
<AttributeName Language="C#">[System.Runtime.InteropServices.ComDefaultInterface(typeof(System.Runtime.InteropServices._Attribute))]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.InteropServices.ComDefaultInterface(typeof(System.Runtime.InteropServices._Attribute))>]</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1">
<AttributeName Language="C#">[System.Runtime.InteropServices.ComVisible(true)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.InteropServices.ComVisible(true)>]</AttributeName>
</Attribute>
</Attributes>
<Docs>
<summary>Represents the base class for custom attributes.</summary>
<remarks>
<format type="text/markdown">< and [Attributes](/dotnet/standard/attributes/).
## Examples
The following code example demonstrates the usage of <xref:System.Attribute>.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR/AnimalAttributes/CPP/customattribute.cpp" id="Snippet1":::
:::code language="csharp" source="~/snippets/csharp/System/Attribute/Overview/customattribute.cs" interactive="try-dotnet" id="Snippet1":::
:::code language="fsharp" source="~/snippets/fsharp/VS_Snippets_CLR/AnimalAttributes/FS/customattribute.fs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR/AnimalAttributes/VB/customattribute.vb" id="Snippet1":::
]]></format>
</remarks>
<threadsafe>This type is thread safe.</threadsafe>
<related type="Article" href="/dotnet/standard/attributes/applying-attributes">Applying Attributes</related>
<related type="Article" href="/dotnet/standard/attributes/">Extending Metadata Using Attributes</related>
</Docs>
<Members>
<Member MemberName=".ctor">
<MemberSignature Language="C#" Value="protected Attribute ();" />
<MemberSignature Language="ILAsm" Value=".method familyhidebysig specialname rtspecialname instance void .ctor() cil managed" />
<MemberSignature Language="DocId" Value="M:System.Attribute.#ctor" />
<MemberSignature Language="VB.NET" Value="Protected Sub New ()" />
<MemberSignature Language="C++ CLI" Value="protected:
 Attribute();" />
<MemberType>Constructor</MemberType>
<AssemblyInfo>
<AssemblyName>System.Runtime</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.10.0</AssemblyVersion>
<AssemblyVersion>4.0.20.0</AssemblyVersion>
<AssemblyVersion>4.1.0.0</AssemblyVersion>
<AssemblyVersion>4.2.0.0</AssemblyVersion>
<AssemblyVersion>4.2.1.0</AssemblyVersion>
<AssemblyVersion>4.2.2.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>mscorlib</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<Parameters />
<Docs>
<summary>Initializes a new instance of the <see cref="T:System.Attribute" /> class.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
This constructor is only called by classes that derive from <xref:System.Attribute>.
## Examples
The following code example shows the definition of a custom parameter <xref:System.Attribute> class with its constructor.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR_System/system.Attribute.GetCustomAttribute/CPP/getcustattrparam.cpp" id="Snippet2":::
:::code language="csharp" source="~/snippets/csharp/System/Attribute/.ctor/getcustattrparam.cs" id="Snippet2":::
:::code language="fsharp" source="~/snippets/fsharp/VS_Snippets_CLR_System/system.Attribute.GetCustomAttribute/FS/getcustattrparam.fs" id="Snippet2":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.Attribute.GetCustomAttribute/VB/getcustattrparam.vb" id="Snippet2":::
]]></format>
</remarks>
</Docs>
</Member>
<Member MemberName="Equals">
<MemberSignature Language="C#" Value="public override bool Equals (object obj);" FrameworkAlternate="dotnet-uwp-10.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-1.0;netstandard-1.1;netstandard-1.2;netstandard-1.3;netstandard-1.4;netstandard-1.5;netstandard-1.6;netstandard-2.0;netstandard-2.1" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig virtual instance bool Equals(object obj) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Attribute.Equals(System.Object)" />
<MemberSignature Language="VB.NET" Value="Public Overrides Function Equals (obj As Object) As Boolean" />
<MemberSignature Language="F#" Value="override this.Equals : obj -> bool" Usage="attribute.Equals obj" />
<MemberSignature Language="C++ CLI" Value="public:
 override bool Equals(System::Object ^ obj);" />
<MemberSignature Language="C#" Value="public override bool Equals (object? obj);" FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-3.0;netcore-3.1" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Runtime</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.10.0</AssemblyVersion>
<AssemblyVersion>4.0.20.0</AssemblyVersion>
<AssemblyVersion>4.1.0.0</AssemblyVersion>
<AssemblyVersion>4.2.0.0</AssemblyVersion>
<AssemblyVersion>4.2.1.0</AssemblyVersion>
<AssemblyVersion>4.2.2.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>mscorlib</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<Attributes>
<Attribute FrameworkAlternate="net-8.0;net-9.0">
<AttributeName Language="C#">[System.Runtime.CompilerServices.NullableContext(2)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.CompilerServices.NullableContext(2)>]</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-1.0;netstandard-1.1;netstandard-1.2">
<AttributeName Language="C#">[System.Security.SecuritySafeCritical]</AttributeName>
<AttributeName Language="F#">[<System.Security.SecuritySafeCritical>]</AttributeName>
</Attribute>
</Attributes>
<ReturnValue>
<ReturnType>System.Boolean</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="obj" Type="System.Object">
<Attributes>
<Attribute FrameworkAlternate="net-6.0;net-7.0;net-8.0;net-9.0">
<AttributeName Language="C#">[System.Diagnostics.CodeAnalysis.NotNullWhen(true)]</AttributeName>
<AttributeName Language="F#">[<System.Diagnostics.CodeAnalysis.NotNullWhen(true)>]</AttributeName>
</Attribute>
</Attributes>
</Parameter>
</Parameters>
<Docs>
<param name="obj">An <see cref="T:System.Object" /> to compare with this instance or <see langword="null" />.</param>
<summary>Returns a value that indicates whether this instance is equal to a specified object.</summary>
<returns>
<see langword="true" /> if <paramref name="obj" /> and this instance are of the same type and have identical field values; otherwise, <see langword="false" />.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The <xref:System.Attribute.Equals%2A> method uses reflection to retrieve field information for the current instance and the `obj` argument. It then compares field values.
When implementing your own class derived from <xref:System.Attribute>, you can override the <xref:System.Attribute.Equals%2A> method. Because it uses reflection, we recommend that you do so. However, your override should perform a standard test for reference equality (the two arguments represent the same object instance) or value equality (the two arguments are of the same type and have identical field values). If you want to perform a custom comparison to determine whether two attributes objects are equal, you can override the <xref:System.Attribute.Match%2A> method.
## Examples
The following example defines two custom parameter <xref:System.Attribute> classes, then creates several objects of each class and uses the <xref:System.Attribute.Equals%2A> method to compare them.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR_System/system.Attribute.Equals/CPP/equals.cpp":::
:::code language="csharp" source="~/snippets/csharp/System/Attribute/Equals/equals.cs" interactive="try-dotnet":::
:::code language="fsharp" source="~/snippets/fsharp/VS_Snippets_CLR_System/system.Attribute.Equals/FS/equals.fs":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.Attribute.Equals/VB/equals.vb":::
]]></format>
</remarks>
</Docs>
</Member>
<MemberGroup MemberName="GetCustomAttribute">
<AssemblyInfo>
<AssemblyName>mscorlib</AssemblyName>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Docs>
<summary>Retrieves a custom attribute of a specified type applied to an assembly, module, type member, or method parameter.</summary>
</Docs>
</MemberGroup>
<Member MemberName="GetCustomAttribute">
<MemberSignature Language="C#" Value="public static Attribute? GetCustomAttribute (System.Reflection.Assembly element, Type attributeType);" FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-3.0;netcore-3.1" />
<MemberSignature Language="ILAsm" Value=".method public static hidebysig class System.Attribute GetCustomAttribute(class System.Reflection.Assembly element, class System.Type attributeType) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Attribute.GetCustomAttribute(System.Reflection.Assembly,System.Type)" />
<MemberSignature Language="VB.NET" Value="Public Shared Function GetCustomAttribute (element As Assembly, attributeType As Type) As Attribute" />
<MemberSignature Language="F#" Value="static member GetCustomAttribute : System.Reflection.Assembly * Type -> Attribute" Usage="System.Attribute.GetCustomAttribute (element, attributeType)" />
<MemberSignature Language="C++ CLI" Value="public:
 static Attribute ^ GetCustomAttribute(System::Reflection::Assembly ^ element, Type ^ attributeType);" />
<MemberSignature Language="C#" Value="public static Attribute GetCustomAttribute (System.Reflection.Assembly element, Type attributeType);" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>mscorlib</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Runtime</AssemblyName>
<AssemblyVersion>4.2.0.0</AssemblyVersion>
<AssemblyVersion>4.2.1.0</AssemblyVersion>
<AssemblyVersion>4.2.2.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Attribute</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="element" Type="System.Reflection.Assembly" Index="0" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netstandard-2.0;netstandard-2.1;netcore-3.1;net-5.0;net-6.0;net-7.0;netframework-4.8.1;net-8.0;net-9.0" />
<Parameter Name="attributeType" Type="System.Type" Index="1" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netstandard-2.0;netstandard-2.1;netcore-3.1;net-5.0;net-6.0;net-7.0;netframework-4.8.1;net-8.0;net-9.0" />
</Parameters>
<Docs>
<param name="element">An object derived from the <see cref="T:System.Reflection.Assembly" /> class that describes a reusable collection of modules.</param>
<param name="attributeType">The type, or a base type, of the custom attribute to search for.</param>
<summary>Retrieves a custom attribute applied to a specified assembly. Parameters specify the assembly and the type of the custom attribute to search for.</summary>
<returns>A reference to the single custom attribute of type <paramref name="attributeType" /> that is applied to <paramref name="element" />, or <see langword="null" /> if there is no such attribute.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
Use the <xref:System.Attribute.GetCustomAttributes%2A> method if you expect more than one value to be returned, or <xref:System.Reflection.AmbiguousMatchException> will be thrown.
> [!NOTE]
> Starting with the .NET Framework version 2.0, this method returns security attributes if the attributes are stored in the new metadata format. Assemblies compiled with version 2.0 or later use the new format. Dynamic assemblies and assemblies compiled with earlier versions of the .NET Framework use the old XML format. See [Emitting Declarative Security Attributes](/previous-versions/dotnet/netframework-4.0/ms404249(v=vs.100)).
## Examples
The following code example illustrates the use of the <xref:System.Attribute.GetCustomAttribute%2A> method taking an <xref:System.Reflection.Assembly> as a parameter.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR/IsDefined/CPP/isdefined.cpp" id="Snippet1":::
:::code language="csharp" source="~/snippets/csharp/System/Attribute/GetCustomAttribute/id1.cs" id="Snippet1":::
:::code language="fsharp" source="~/snippets/fsharp/VS_Snippets_CLR/IsDefined/FS/id1.fs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR/IsDefined/VB/id1.vb" id="Snippet1":::
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="element" /> or <paramref name="attributeType" /> is <see langword="null" />.</exception>
<exception cref="T:System.ArgumentException">
<paramref name="attributeType" /> is not derived from <see cref="T:System.Attribute" />.</exception>
<exception cref="T:System.Reflection.AmbiguousMatchException">More than one of the requested attributes was found.</exception>
</Docs>
</Member>
<Member MemberName="GetCustomAttribute">
<MemberSignature Language="C#" Value="public static Attribute? GetCustomAttribute (System.Reflection.MemberInfo element, Type attributeType);" FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-3.0;netcore-3.1" />
<MemberSignature Language="ILAsm" Value=".method public static hidebysig class System.Attribute GetCustomAttribute(class System.Reflection.MemberInfo element, class System.Type attributeType) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Attribute.GetCustomAttribute(System.Reflection.MemberInfo,System.Type)" />
<MemberSignature Language="VB.NET" Value="Public Shared Function GetCustomAttribute (element As MemberInfo, attributeType As Type) As Attribute" />
<MemberSignature Language="F#" Value="static member GetCustomAttribute : System.Reflection.MemberInfo * Type -> Attribute" Usage="System.Attribute.GetCustomAttribute (element, attributeType)" />
<MemberSignature Language="C++ CLI" Value="public:
 static Attribute ^ GetCustomAttribute(System::Reflection::MemberInfo ^ element, Type ^ attributeType);" />
<MemberSignature Language="C#" Value="public static Attribute GetCustomAttribute (System.Reflection.MemberInfo element, Type attributeType);" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>mscorlib</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Runtime</AssemblyName>
<AssemblyVersion>4.2.0.0</AssemblyVersion>
<AssemblyVersion>4.2.1.0</AssemblyVersion>
<AssemblyVersion>4.2.2.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Attribute</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="element" Type="System.Reflection.MemberInfo" Index="0" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netstandard-2.0;netstandard-2.1;netcore-3.1;net-5.0;net-6.0;net-7.0;netframework-4.8.1;net-8.0;net-9.0" />
<Parameter Name="attributeType" Type="System.Type" Index="1" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netstandard-2.0;netstandard-2.1;netcore-3.1;net-5.0;net-6.0;net-7.0;netframework-4.8.1;net-8.0;net-9.0" />
</Parameters>
<Docs>
<param name="element">An object derived from the <see cref="T:System.Reflection.MemberInfo" /> class that describes a constructor, event, field, method, or property member of a class.</param>
<param name="attributeType">The type, or a base type, of the custom attribute to search for.</param>
<summary>Retrieves a custom attribute applied to a member of a type. Parameters specify the member, and the type of the custom attribute to search for.</summary>
<returns>A reference to the single custom attribute of type <paramref name="attributeType" /> that is applied to <paramref name="element" />, or <see langword="null" /> if there is no such attribute.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
A match is determined in the same way described in the Return Value section of <xref:System.Type.IsAssignableFrom%2A?displayProperty=nameWithType>.
> [!NOTE]
> Starting with the .NET Framework version 2.0, this method returns security attributes on types, methods, and constructors if the attributes are stored in the new metadata format. Assemblies compiled with version 2.0 or later use the new format. Dynamic assemblies and assemblies compiled with earlier versions of the .NET Framework use the old XML format. See [Emitting Declarative Security Attributes](/previous-versions/dotnet/netframework-4.0/ms404249(v=vs.100)).
## Examples
The following code example illustrates the use of the <xref:System.Attribute.GetCustomAttribute%2A> method taking a <xref:System.Reflection.MemberInfo> as a parameter.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR/IsDefined/CPP/isdefined.cpp" id="Snippet4":::
:::code language="csharp" source="~/snippets/csharp/System/Attribute/GetCustomAttribute/id4.cs" interactive="try-dotnet" id="Snippet4":::
:::code language="fsharp" source="~/snippets/fsharp/VS_Snippets_CLR/IsDefined/FS/id4.fs" id="Snippet4":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR/IsDefined/VB/id4.vb" id="Snippet4":::
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="element" /> or <paramref name="attributeType" /> is <see langword="null" />.</exception>
<exception cref="T:System.ArgumentException">
<paramref name="attributeType" /> is not derived from <see cref="T:System.Attribute" />.</exception>
<exception cref="T:System.NotSupportedException">
<paramref name="element" /> is not a constructor, method, property, event, type, or field.</exception>
<exception cref="T:System.Reflection.AmbiguousMatchException">More than one of the requested attributes was found.</exception>
<exception cref="T:System.TypeLoadException">A custom attribute type cannot be loaded.</exception>
</Docs>
</Member>
<Member MemberName="GetCustomAttribute">
<MemberSignature Language="C#" Value="public static Attribute? GetCustomAttribute (System.Reflection.Module element, Type attributeType);" FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-3.0;netcore-3.1" />
<MemberSignature Language="ILAsm" Value=".method public static hidebysig class System.Attribute GetCustomAttribute(class System.Reflection.Module element, class System.Type attributeType) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Attribute.GetCustomAttribute(System.Reflection.Module,System.Type)" />
<MemberSignature Language="VB.NET" Value="Public Shared Function GetCustomAttribute (element As Module, attributeType As Type) As Attribute" />
<MemberSignature Language="F#" Value="static member GetCustomAttribute : System.Reflection.Module * Type -> Attribute" Usage="System.Attribute.GetCustomAttribute (element, attributeType)" />
<MemberSignature Language="C++ CLI" Value="public:
 static Attribute ^ GetCustomAttribute(System::Reflection::Module ^ element, Type ^ attributeType);" />
<MemberSignature Language="C#" Value="public static Attribute GetCustomAttribute (System.Reflection.Module element, Type attributeType);" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>mscorlib</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Runtime</AssemblyName>
<AssemblyVersion>4.2.0.0</AssemblyVersion>
<AssemblyVersion>4.2.1.0</AssemblyVersion>
<AssemblyVersion>4.2.2.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Attribute</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="element" Type="System.Reflection.Module" Index="0" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netstandard-2.0;netstandard-2.1;netcore-3.1;net-5.0;net-6.0;net-7.0;netframework-4.8.1;net-8.0;net-9.0" />
<Parameter Name="attributeType" Type="System.Type" Index="1" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netstandard-2.0;netstandard-2.1;netcore-3.1;net-5.0;net-6.0;net-7.0;netframework-4.8.1;net-8.0;net-9.0" />
</Parameters>
<Docs>
<param name="element">An object derived from the <see cref="T:System.Reflection.Module" /> class that describes a portable executable file.</param>
<param name="attributeType">The type, or a base type, of the custom attribute to search for.</param>
<summary>Retrieves a custom attribute applied to a module. Parameters specify the module, and the type of the custom attribute to search for.</summary>
<returns>A reference to the single custom attribute of type <paramref name="attributeType" /> that is applied to <paramref name="element" />, or <see langword="null" /> if there is no such attribute.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Examples
The following code example illustrates the use of the <xref:System.Attribute.GetCustomAttribute%2A> method taking a <xref:System.Reflection.Module> as a parameter.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR/IsDefined/CPP/isdefined.cpp" id="Snippet2":::
:::code language="csharp" source="~/snippets/csharp/System/Attribute/GetCustomAttribute/id2.cs" id="Snippet2":::
:::code language="fsharp" source="~/snippets/fsharp/VS_Snippets_CLR/IsDefined/FS/id2.fs" id="Snippet2":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR/IsDefined/VB/id2.vb" id="Snippet2":::
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="element" /> or <paramref name="attributeType" /> is <see langword="null" />.</exception>
<exception cref="T:System.ArgumentException">
<paramref name="attributeType" /> is not derived from <see cref="T:System.Attribute" />.</exception>
<exception cref="T:System.Reflection.AmbiguousMatchException">More than one of the requested attributes was found.</exception>
</Docs>
</Member>
<Member MemberName="GetCustomAttribute">
<MemberSignature Language="C#" Value="public static Attribute? GetCustomAttribute (System.Reflection.ParameterInfo element, Type attributeType);" FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-3.0;netcore-3.1" />
<MemberSignature Language="ILAsm" Value=".method public static hidebysig class System.Attribute GetCustomAttribute(class System.Reflection.ParameterInfo element, class System.Type attributeType) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Attribute.GetCustomAttribute(System.Reflection.ParameterInfo,System.Type)" />
<MemberSignature Language="VB.NET" Value="Public Shared Function GetCustomAttribute (element As ParameterInfo, attributeType As Type) As Attribute" />
<MemberSignature Language="F#" Value="static member GetCustomAttribute : System.Reflection.ParameterInfo * Type -> Attribute" Usage="System.Attribute.GetCustomAttribute (element, attributeType)" />
<MemberSignature Language="C++ CLI" Value="public:
 static Attribute ^ GetCustomAttribute(System::Reflection::ParameterInfo ^ element, Type ^ attributeType);" />
<MemberSignature Language="C#" Value="public static Attribute GetCustomAttribute (System.Reflection.ParameterInfo element, Type attributeType);" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>mscorlib</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Runtime</AssemblyName>
<AssemblyVersion>4.2.0.0</AssemblyVersion>
<AssemblyVersion>4.2.1.0</AssemblyVersion>
<AssemblyVersion>4.2.2.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Attribute</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="element" Type="System.Reflection.ParameterInfo" Index="0" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netstandard-2.0;netstandard-2.1;netcore-3.1;net-5.0;net-6.0;net-7.0;netframework-4.8.1;net-8.0;net-9.0" />
<Parameter Name="attributeType" Type="System.Type" Index="1" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netstandard-2.0;netstandard-2.1;netcore-3.1;net-5.0;net-6.0;net-7.0;netframework-4.8.1;net-8.0;net-9.0" />
</Parameters>
<Docs>
<param name="element">An object derived from the <see cref="T:System.Reflection.ParameterInfo" /> class that describes a parameter of a member of a class.</param>
<param name="attributeType">The type, or a base type, of the custom attribute to search for.</param>
<summary>Retrieves a custom attribute applied to a method parameter. Parameters specify the method parameter, and the type of the custom attribute to search for.</summary>
<returns>A reference to the single custom attribute of type <paramref name="attributeType" /> that is applied to <paramref name="element" />, or <see langword="null" /> if there is no such attribute.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
If `element` represents a parameter in a method of a derived type, the return value includes the inheritable custom attributes applied to the same parameter in the overridden base methods.
## Examples
The following code example defines a custom parameter <xref:System.Attribute> class and applies the custom attribute to a method in a derived class and the base of the derived class. The example shows the use of the <xref:System.Attribute.GetCustomAttribute%2A> method to return the attributes.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR_System/system.Attribute.GetCustomAttribute/CPP/getcustattrparam.cpp" id="Snippet1":::
:::code language="csharp" source="~/snippets/csharp/System/Attribute/.ctor/getcustattrparam.cs" interactive="try-dotnet" id="Snippet1":::
:::code language="fsharp" source="~/snippets/fsharp/VS_Snippets_CLR_System/system.Attribute.GetCustomAttribute/FS/getcustattrparam.fs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.Attribute.GetCustomAttribute/VB/getcustattrparam.vb" id="Snippet1":::
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="element" /> or <paramref name="attributeType" /> is <see langword="null" />.</exception>
<exception cref="T:System.ArgumentException">
<paramref name="attributeType" /> is not derived from <see cref="T:System.Attribute" />.</exception>
<exception cref="T:System.Reflection.AmbiguousMatchException">More than one of the requested attributes was found.</exception>
<exception cref="T:System.TypeLoadException">A custom attribute type cannot be loaded.</exception>
</Docs>
</Member>
<Member MemberName="GetCustomAttribute">
<MemberSignature Language="C#" Value="public static Attribute? GetCustomAttribute (System.Reflection.Assembly element, Type attributeType, bool inherit);" FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-3.0;netcore-3.1" />
<MemberSignature Language="ILAsm" Value=".method public static hidebysig class System.Attribute GetCustomAttribute(class System.Reflection.Assembly element, class System.Type attributeType, bool inherit) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Attribute.GetCustomAttribute(System.Reflection.Assembly,System.Type,System.Boolean)" />
<MemberSignature Language="VB.NET" Value="Public Shared Function GetCustomAttribute (element As Assembly, attributeType As Type, inherit As Boolean) As Attribute" />
<MemberSignature Language="F#" Value="static member GetCustomAttribute : System.Reflection.Assembly * Type * bool -> Attribute" Usage="System.Attribute.GetCustomAttribute (element, attributeType, inherit)" />
<MemberSignature Language="C++ CLI" Value="public:
 static Attribute ^ GetCustomAttribute(System::Reflection::Assembly ^ element, Type ^ attributeType, bool inherit);" />
<MemberSignature Language="C#" Value="public static Attribute GetCustomAttribute (System.Reflection.Assembly element, Type attributeType, bool inherit);" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>mscorlib</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Runtime</AssemblyName>
<AssemblyVersion>4.2.0.0</AssemblyVersion>
<AssemblyVersion>4.2.1.0</AssemblyVersion>
<AssemblyVersion>4.2.2.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Attribute</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="element" Type="System.Reflection.Assembly" Index="0" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netstandard-2.0;netstandard-2.1;netcore-3.1;net-5.0;net-6.0;net-7.0;netframework-4.8.1;net-8.0;net-9.0" />
<Parameter Name="attributeType" Type="System.Type" Index="1" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netstandard-2.0;netstandard-2.1;netcore-3.1;net-5.0;net-6.0;net-7.0;netframework-4.8.1;net-8.0;net-9.0" />
<Parameter Name="inherit" Type="System.Boolean" Index="2" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netstandard-2.0;netstandard-2.1;netcore-3.1;net-5.0;net-6.0;net-7.0;netframework-4.8.1;net-8.0;net-9.0" />
</Parameters>
<Docs>
<param name="element">An object derived from the <see cref="T:System.Reflection.Assembly" /> class that describes a reusable collection of modules.</param>
<param name="attributeType">The type, or a base type, of the custom attribute to search for.</param>
<param name="inherit">This parameter is ignored, and does not affect the operation of this method.</param>
<summary>Retrieves a custom attribute applied to an assembly. Parameters specify the assembly, the type of the custom attribute to search for, and an ignored search option.</summary>
<returns>A reference to the single custom attribute of type <paramref name="attributeType" /> that is applied to <paramref name="element" />, or <see langword="null" /> if there is no such attribute.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
> [!NOTE]
> Starting with the .NET Framework version 2.0, this method returns security attributes if the attributes are stored in the new metadata format. Assemblies compiled with version 2.0 or later use the new format. Dynamic assemblies and assemblies compiled with earlier versions of the .NET Framework use the old XML format. See [Emitting Declarative Security Attributes](/previous-versions/dotnet/netframework-4.0/ms404249(v=vs.100)).
## Examples
The following code example illustrates the use of the <xref:System.Attribute.GetCustomAttribute%2A> method taking an <xref:System.Reflection.Assembly> as a parameter.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR/IsDefined/CPP/isdefined.cpp" id="Snippet1":::
:::code language="csharp" source="~/snippets/csharp/System/Attribute/GetCustomAttribute/id1.cs" id="Snippet1":::
:::code language="fsharp" source="~/snippets/fsharp/VS_Snippets_CLR/IsDefined/FS/id1.fs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR/IsDefined/VB/id1.vb" id="Snippet1":::
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="element" /> or <paramref name="attributeType" /> is <see langword="null" />.</exception>
<exception cref="T:System.ArgumentException">
<paramref name="attributeType" /> is not derived from <see cref="T:System.Attribute" />.</exception>
<exception cref="T:System.Reflection.AmbiguousMatchException">More than one of the requested attributes was found.</exception>
</Docs>
</Member>
<Member MemberName="GetCustomAttribute">
<MemberSignature Language="C#" Value="public static Attribute? GetCustomAttribute (System.Reflection.MemberInfo element, Type attributeType, bool inherit);" FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-3.0;netcore-3.1" />
<MemberSignature Language="ILAsm" Value=".method public static hidebysig class System.Attribute GetCustomAttribute(class System.Reflection.MemberInfo element, class System.Type attributeType, bool inherit) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Attribute.GetCustomAttribute(System.Reflection.MemberInfo,System.Type,System.Boolean)" />
<MemberSignature Language="VB.NET" Value="Public Shared Function GetCustomAttribute (element As MemberInfo, attributeType As Type, inherit As Boolean) As Attribute" />
<MemberSignature Language="F#" Value="static member GetCustomAttribute : System.Reflection.MemberInfo * Type * bool -> Attribute" Usage="System.Attribute.GetCustomAttribute (element, attributeType, inherit)" />
<MemberSignature Language="C++ CLI" Value="public:
 static Attribute ^ GetCustomAttribute(System::Reflection::MemberInfo ^ element, Type ^ attributeType, bool inherit);" />
<MemberSignature Language="C#" Value="public static Attribute GetCustomAttribute (System.Reflection.MemberInfo element, Type attributeType, bool inherit);" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>mscorlib</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Runtime</AssemblyName>
<AssemblyVersion>4.2.0.0</AssemblyVersion>
<AssemblyVersion>4.2.1.0</AssemblyVersion>
<AssemblyVersion>4.2.2.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Attribute</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="element" Type="System.Reflection.MemberInfo" Index="0" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netstandard-2.0;netstandard-2.1;netcore-3.1;net-5.0;net-6.0;net-7.0;netframework-4.8.1;net-8.0;net-9.0" />
<Parameter Name="attributeType" Type="System.Type" Index="1" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netstandard-2.0;netstandard-2.1;netcore-3.1;net-5.0;net-6.0;net-7.0;netframework-4.8.1;net-8.0;net-9.0" />
<Parameter Name="inherit" Type="System.Boolean" Index="2" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netstandard-2.0;netstandard-2.1;netcore-3.1;net-5.0;net-6.0;net-7.0;netframework-4.8.1;net-8.0;net-9.0" />
</Parameters>
<Docs>
<param name="element">An object derived from the <see cref="T:System.Reflection.MemberInfo" /> class that describes a constructor, event, field, method, or property member of a class.</param>
<param name="attributeType">The type, or a base type, of the custom attribute to search for.</param>
<param name="inherit">If <see langword="true" />, specifies to also search the ancestors of <paramref name="element" /> for custom attributes.</param>
<summary>Retrieves a custom attribute applied to a member of a type. Parameters specify the member, the type of the custom attribute to search for, and whether to search ancestors of the member.</summary>
<returns>A reference to the single custom attribute of type <paramref name="attributeType" /> that is applied to <paramref name="element" />, or <see langword="null" /> if there is no such attribute.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
> [!NOTE]
> Starting with the .NET Framework version 2.0, this method returns security attributes on types, methods, and constructors if the attributes are stored in the new metadata format. Assemblies compiled with version 2.0 or later use the new format. Dynamic assemblies and assemblies compiled with earlier versions of the .NET Framework use the old XML format. See [Emitting Declarative Security Attributes](/previous-versions/dotnet/netframework-4.0/ms404249(v=vs.100)).
## Examples
The following code example illustrates the use of the <xref:System.Attribute.GetCustomAttribute%2A> method taking a <xref:System.Reflection.MemberInfo> as a parameter.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR/IsDefined/CPP/isdefined.cpp" id="Snippet4":::
:::code language="csharp" source="~/snippets/csharp/System/Attribute/GetCustomAttribute/id4.cs" interactive="try-dotnet" id="Snippet4":::
:::code language="fsharp" source="~/snippets/fsharp/VS_Snippets_CLR/IsDefined/FS/id4.fs" id="Snippet4":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR/IsDefined/VB/id4.vb" id="Snippet4":::
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="element" /> or <paramref name="attributeType" /> is <see langword="null" />.</exception>
<exception cref="T:System.ArgumentException">
<paramref name="attributeType" /> is not derived from <see cref="T:System.Attribute" />.</exception>
<exception cref="T:System.NotSupportedException">
<paramref name="element" /> is not a constructor, method, property, event, type, or field.</exception>
<exception cref="T:System.Reflection.AmbiguousMatchException">More than one of the requested attributes was found.</exception>
<exception cref="T:System.TypeLoadException">A custom attribute type cannot be loaded.</exception>
</Docs>
</Member>
<Member MemberName="GetCustomAttribute">
<MemberSignature Language="C#" Value="public static Attribute? GetCustomAttribute (System.Reflection.Module element, Type attributeType, bool inherit);" FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-3.0;netcore-3.1" />
<MemberSignature Language="ILAsm" Value=".method public static hidebysig class System.Attribute GetCustomAttribute(class System.Reflection.Module element, class System.Type attributeType, bool inherit) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Attribute.GetCustomAttribute(System.Reflection.Module,System.Type,System.Boolean)" />
<MemberSignature Language="VB.NET" Value="Public Shared Function GetCustomAttribute (element As Module, attributeType As Type, inherit As Boolean) As Attribute" />
<MemberSignature Language="F#" Value="static member GetCustomAttribute : System.Reflection.Module * Type * bool -> Attribute" Usage="System.Attribute.GetCustomAttribute (element, attributeType, inherit)" />
<MemberSignature Language="C++ CLI" Value="public:
 static Attribute ^ GetCustomAttribute(System::Reflection::Module ^ element, Type ^ attributeType, bool inherit);" />
<MemberSignature Language="C#" Value="public static Attribute GetCustomAttribute (System.Reflection.Module element, Type attributeType, bool inherit);" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>mscorlib</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Runtime</AssemblyName>
<AssemblyVersion>4.2.0.0</AssemblyVersion>
<AssemblyVersion>4.2.1.0</AssemblyVersion>
<AssemblyVersion>4.2.2.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Attribute</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="element" Type="System.Reflection.Module" Index="0" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netstandard-2.0;netstandard-2.1;netcore-3.1;net-5.0;net-6.0;net-7.0;netframework-4.8.1;net-8.0;net-9.0" />
<Parameter Name="attributeType" Type="System.Type" Index="1" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netstandard-2.0;netstandard-2.1;netcore-3.1;net-5.0;net-6.0;net-7.0;netframework-4.8.1;net-8.0;net-9.0" />
<Parameter Name="inherit" Type="System.Boolean" Index="2" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netstandard-2.0;netstandard-2.1;netcore-3.1;net-5.0;net-6.0;net-7.0;netframework-4.8.1;net-8.0;net-9.0" />
</Parameters>
<Docs>
<param name="element">An object derived from the <see cref="T:System.Reflection.Module" /> class that describes a portable executable file.</param>
<param name="attributeType">The type, or a base type, of the custom attribute to search for.</param>
<param name="inherit">This parameter is ignored, and does not affect the operation of this method.</param>
<summary>Retrieves a custom attribute applied to a module. Parameters specify the module, the type of the custom attribute to search for, and an ignored search option.</summary>
<returns>A reference to the single custom attribute of type <paramref name="attributeType" /> that is applied to <paramref name="element" />, or <see langword="null" /> if there is no such attribute.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Examples
The following code example illustrates the use of the <xref:System.Attribute.GetCustomAttribute%2A> method taking a <xref:System.Reflection.Module> as a parameter.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR/IsDefined/CPP/isdefined.cpp" id="Snippet2":::
:::code language="csharp" source="~/snippets/csharp/System/Attribute/GetCustomAttribute/id2.cs" id="Snippet2":::
:::code language="fsharp" source="~/snippets/fsharp/VS_Snippets_CLR/IsDefined/FS/id2.fs" id="Snippet2":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR/IsDefined/VB/id2.vb" id="Snippet2":::
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="element" /> or <paramref name="attributeType" /> is <see langword="null" />.</exception>
<exception cref="T:System.ArgumentException">
<paramref name="attributeType" /> is not derived from <see cref="T:System.Attribute" />.</exception>
<exception cref="T:System.Reflection.AmbiguousMatchException">More than one of the requested attributes was found.</exception>
</Docs>
</Member>
<Member MemberName="GetCustomAttribute">
<MemberSignature Language="C#" Value="public static Attribute? GetCustomAttribute (System.Reflection.ParameterInfo element, Type attributeType, bool inherit);" FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-3.0;netcore-3.1" />
<MemberSignature Language="ILAsm" Value=".method public static hidebysig class System.Attribute GetCustomAttribute(class System.Reflection.ParameterInfo element, class System.Type attributeType, bool inherit) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Attribute.GetCustomAttribute(System.Reflection.ParameterInfo,System.Type,System.Boolean)" />
<MemberSignature Language="VB.NET" Value="Public Shared Function GetCustomAttribute (element As ParameterInfo, attributeType As Type, inherit As Boolean) As Attribute" />
<MemberSignature Language="F#" Value="static member GetCustomAttribute : System.Reflection.ParameterInfo * Type * bool -> Attribute" Usage="System.Attribute.GetCustomAttribute (element, attributeType, inherit)" />
<MemberSignature Language="C++ CLI" Value="public:
 static Attribute ^ GetCustomAttribute(System::Reflection::ParameterInfo ^ element, Type ^ attributeType, bool inherit);" />
<MemberSignature Language="C#" Value="public static Attribute GetCustomAttribute (System.Reflection.ParameterInfo element, Type attributeType, bool inherit);" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>mscorlib</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Runtime</AssemblyName>
<AssemblyVersion>4.2.0.0</AssemblyVersion>
<AssemblyVersion>4.2.1.0</AssemblyVersion>
<AssemblyVersion>4.2.2.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Attribute</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="element" Type="System.Reflection.ParameterInfo" Index="0" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netstandard-2.0;netstandard-2.1;netcore-3.1;net-5.0;net-6.0;net-7.0;netframework-4.8.1;net-8.0;net-9.0" />
<Parameter Name="attributeType" Type="System.Type" Index="1" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netstandard-2.0;netstandard-2.1;netcore-3.1;net-5.0;net-6.0;net-7.0;netframework-4.8.1;net-8.0;net-9.0" />
<Parameter Name="inherit" Type="System.Boolean" Index="2" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netstandard-2.0;netstandard-2.1;netcore-3.1;net-5.0;net-6.0;net-7.0;netframework-4.8.1;net-8.0;net-9.0" />
</Parameters>
<Docs>
<param name="element">An object derived from the <see cref="T:System.Reflection.ParameterInfo" /> class that describes a parameter of a member of a class.</param>
<param name="attributeType">The type, or a base type, of the custom attribute to search for.</param>
<param name="inherit">If <see langword="true" />, specifies to also search the ancestors of <paramref name="element" /> for custom attributes.</param>
<summary>Retrieves a custom attribute applied to a method parameter. Parameters specify the method parameter, the type of the custom attribute to search for, and whether to search ancestors of the method parameter.</summary>
<returns>A reference to the single custom attribute of type <paramref name="attributeType" /> that is applied to <paramref name="element" />, or <see langword="null" /> if there is no such attribute.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
If `element` represents a parameter in a method of a derived type, the return value includes the inheritable custom attributes applied to the same parameter in the overridden base methods.
## Examples
The following code example defines a custom parameter <xref:System.Attribute> class and applies the custom attribute to a method in a derived class and the base of the derived class. The example shows the use of the <xref:System.Attribute.GetCustomAttribute%2A> method to return the attributes.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR_System/system.Attribute.GetCustomAttribute/CPP/getcustattrprminh.cpp" id="Snippet3":::
:::code language="csharp" source="~/snippets/csharp/System/Attribute/.ctor/getcustattrprminh.cs" interactive="try-dotnet" id="Snippet3":::
:::code language="fsharp" source="~/snippets/fsharp/VS_Snippets_CLR_System/system.Attribute.GetCustomAttribute/FS/getcustattrprminh.fs" id="Snippet3":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.Attribute.GetCustomAttribute/VB/getcustattrprminh.vb" id="Snippet3":::
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="element" /> or <paramref name="attributeType" /> is <see langword="null" />.</exception>
<exception cref="T:System.ArgumentException">
<paramref name="attributeType" /> is not derived from <see cref="T:System.Attribute" />.</exception>
<exception cref="T:System.Reflection.AmbiguousMatchException">More than one of the requested attributes was found.</exception>
<exception cref="T:System.TypeLoadException">A custom attribute type cannot be loaded.</exception>
</Docs>
</Member>
<MemberGroup MemberName="GetCustomAttributes">
<AssemblyInfo>
<AssemblyName>mscorlib</AssemblyName>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Docs>
<summary>Retrieves an array of the custom attributes applied to an assembly, module, type member, or method parameter.</summary>
</Docs>
</MemberGroup>
<Member MemberName="GetCustomAttributes">
<MemberSignature Language="C#" Value="public static Attribute[] GetCustomAttributes (System.Reflection.Assembly element);" />
<MemberSignature Language="ILAsm" Value=".method public static hidebysig class System.Attribute[] GetCustomAttributes(class System.Reflection.Assembly element) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Attribute.GetCustomAttributes(System.Reflection.Assembly)" />
<MemberSignature Language="VB.NET" Value="Public Shared Function GetCustomAttributes (element As Assembly) As Attribute()" />
<MemberSignature Language="F#" Value="static member GetCustomAttributes : System.Reflection.Assembly -> Attribute[]" Usage="System.Attribute.GetCustomAttributes element" />
<MemberSignature Language="C++ CLI" Value="public:
 static cli::array <Attribute ^> ^ GetCustomAttributes(System::Reflection::Assembly ^ element);" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>mscorlib</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Runtime</AssemblyName>
<AssemblyVersion>4.2.0.0</AssemblyVersion>
<AssemblyVersion>4.2.1.0</AssemblyVersion>
<AssemblyVersion>4.2.2.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Attribute[]</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="element" Type="System.Reflection.Assembly" Index="0" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netstandard-2.0;netstandard-2.1;netcore-3.1;net-5.0;net-6.0;net-7.0;netframework-4.8.1;net-8.0;net-9.0" />
</Parameters>
<Docs>
<param name="element">An object derived from the <see cref="T:System.Reflection.Assembly" /> class that describes a reusable collection of modules.</param>
<summary>Retrieves an array of the custom attributes applied to an assembly. A parameter specifies the assembly.</summary>
<returns>An <see cref="T:System.Attribute" /> array that contains the custom attributes applied to <paramref name="element" />, or an empty array if no such custom attributes exist.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
> [!NOTE]
> Starting with the .NET Framework version 2.0, this method returns security attributes if the attributes are stored in the new metadata format. Assemblies compiled with version 2.0 or later use the new format. Dynamic assemblies and assemblies compiled with earlier versions of the .NET Framework use the old XML format. See [Emitting Declarative Security Attributes](/previous-versions/dotnet/netframework-4.0/ms404249(v=vs.100)).
## Examples
The following example retrieves the custom attributes found in the current assembly.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR/GetCustomAttributes/CPP/ca1.cpp" id="Snippet1":::
:::code language="csharp" source="~/snippets/csharp/System/Attribute/GetCustomAttributes/ca1.cs" id="Snippet1":::
:::code language="fsharp" source="~/snippets/fsharp/VS_Snippets_CLR/GetCustomAttributes/FS/ca1.fs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR/GetCustomAttributes/VB/ca1.vb" id="Snippet1":::
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="element" /> is <see langword="null" />.</exception>
</Docs>
</Member>
<Member MemberName="GetCustomAttributes">
<MemberSignature Language="C#" Value="public static Attribute[] GetCustomAttributes (System.Reflection.MemberInfo element);" />
<MemberSignature Language="ILAsm" Value=".method public static hidebysig class System.Attribute[] GetCustomAttributes(class System.Reflection.MemberInfo element) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Attribute.GetCustomAttributes(System.Reflection.MemberInfo)" />
<MemberSignature Language="VB.NET" Value="Public Shared Function GetCustomAttributes (element As MemberInfo) As Attribute()" />
<MemberSignature Language="F#" Value="static member GetCustomAttributes : System.Reflection.MemberInfo -> Attribute[]" Usage="System.Attribute.GetCustomAttributes element" />
<MemberSignature Language="C++ CLI" Value="public:
 static cli::array <Attribute ^> ^ GetCustomAttributes(System::Reflection::MemberInfo ^ element);" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>mscorlib</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Runtime</AssemblyName>
<AssemblyVersion>4.2.0.0</AssemblyVersion>
<AssemblyVersion>4.2.1.0</AssemblyVersion>
<AssemblyVersion>4.2.2.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Attribute[]</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="element" Type="System.Reflection.MemberInfo" Index="0" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netstandard-2.0;netstandard-2.1;netcore-3.1;net-5.0;net-6.0;net-7.0;netframework-4.8.1;net-8.0;net-9.0" />
</Parameters>
<Docs>
<param name="element">An object derived from the <see cref="T:System.Reflection.MemberInfo" /> class that describes a constructor, event, field, method, or property member of a class.</param>
<summary>Retrieves an array of the custom attributes applied to a member of a type. A parameter specifies the member.</summary>
<returns>An <see cref="T:System.Attribute" /> array that contains the custom attributes applied to <paramref name="element" />, or an empty array if no such custom attributes exist.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The return value contains the custom attributes for ancestors of `element`.
> [!NOTE]
> Starting with the .NET Framework version 2.0, this method returns security attributes on methods, constructors, and types if the attributes are stored in the new metadata format. Assemblies compiled with version 2.0 or later use the new format. Dynamic assemblies and assemblies compiled with earlier versions of the .NET Framework use the old XML format. See [Emitting Declarative Security Attributes](/previous-versions/dotnet/netframework-4.0/ms404249(v=vs.100)).
## Examples
The following code example demonstrates the use of <xref:System.Attribute.GetCustomAttribute%2A>, taking a <xref:System.Reflection.MemberInfo> as a parameter.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR/GetCustomAttributes/CPP/custattrs.cpp" id="Snippet4":::
:::code language="csharp" source="~/snippets/csharp/System/Attribute/GetCustomAttributes/ca4.cs" id="Snippet4":::
:::code language="fsharp" source="~/snippets/fsharp/VS_Snippets_CLR/GetCustomAttributes/FS/ca4.fs" id="Snippet4":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR/GetCustomAttributes/VB/ca4.vb" id="Snippet4":::
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="element" /> is <see langword="null" />.</exception>
<exception cref="T:System.NotSupportedException">
<paramref name="element" /> is not a constructor, method, property, event, type, or field.</exception>
<exception cref="T:System.TypeLoadException">A custom attribute type cannot be loaded.</exception>
</Docs>
</Member>
<Member MemberName="GetCustomAttributes">
<MemberSignature Language="C#" Value="public static Attribute[] GetCustomAttributes (System.Reflection.Module element);" />
<MemberSignature Language="ILAsm" Value=".method public static hidebysig class System.Attribute[] GetCustomAttributes(class System.Reflection.Module element) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Attribute.GetCustomAttributes(System.Reflection.Module)" />
<MemberSignature Language="VB.NET" Value="Public Shared Function GetCustomAttributes (element As Module) As Attribute()" />
<MemberSignature Language="F#" Value="static member GetCustomAttributes : System.Reflection.Module -> Attribute[]" Usage="System.Attribute.GetCustomAttributes element" />
<MemberSignature Language="C++ CLI" Value="public:
 static cli::array <Attribute ^> ^ GetCustomAttributes(System::Reflection::Module ^ element);" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>mscorlib</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>