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WeakReference.xml
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<Type Name="WeakReference" FullName="System.WeakReference">
<TypeSignature Language="C#" Value="public class WeakReference" FrameworkAlternate="dotnet-uwp-10.0;netcore-1.0;netcore-1.1;netstandard-1.0;netstandard-1.1;netstandard-1.2;netstandard-1.3;netstandard-1.4;netstandard-1.5;netstandard-1.6" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi beforefieldinit WeakReference extends System.Object" FrameworkAlternate="dotnet-uwp-10.0;netcore-1.0;netcore-1.1;netstandard-1.0;netstandard-1.1;netstandard-1.2;netstandard-1.3;netstandard-1.4;netstandard-1.5;netstandard-1.6" />
<TypeSignature Language="DocId" Value="T:System.WeakReference" />
<TypeSignature Language="VB.NET" Value="Public Class WeakReference" FrameworkAlternate="dotnet-uwp-10.0;netcore-1.0;netcore-1.1;netstandard-1.0;netstandard-1.1;netstandard-1.2;netstandard-1.3;netstandard-1.4;netstandard-1.5;netstandard-1.6" />
<TypeSignature Language="F#" Value="type WeakReference = class" FrameworkAlternate="dotnet-uwp-10.0;netcore-1.0;netcore-1.1;netstandard-1.0;netstandard-1.1;netstandard-1.2;netstandard-1.3;netstandard-1.4;netstandard-1.5;netstandard-1.6" />
<TypeSignature Language="C++ CLI" Value="public ref class WeakReference" FrameworkAlternate="dotnet-uwp-10.0;netcore-1.0;netcore-1.1;netstandard-1.0;netstandard-1.1;netstandard-1.2;netstandard-1.3;netstandard-1.4;netstandard-1.5;netstandard-1.6" />
<TypeSignature Language="C#" Value="public class WeakReference : System.Runtime.Serialization.ISerializable" FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;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" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi beforefieldinit WeakReference extends System.Object implements class System.Runtime.Serialization.ISerializable" FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netstandard-2.0;netstandard-2.1" />
<TypeSignature Language="VB.NET" Value="Public Class WeakReference
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<TypeSignature Language="C++ CLI" Value="public ref class WeakReference : System::Runtime::Serialization::ISerializable" FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;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" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi serializable beforefieldinit WeakReference extends System.Object implements class System.Runtime.Serialization.ISerializable" 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" />
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</TypeForwardingChain>
<Base>
<BaseTypeName>System.Object</BaseTypeName>
</Base>
<Interfaces>
<Interface FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;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">
<InterfaceName>System.Runtime.Serialization.ISerializable</InterfaceName>
</Interface>
</Interfaces>
<Attributes>
<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>
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<Attribute FrameworkAlternate="net-8.0;net-9.0">
<AttributeName Language="C#">[System.Runtime.CompilerServices.NullableContext(2)]</AttributeName>
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<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>
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<AttributeName Language="C#">[System.Runtime.InteropServices.ComVisible(true)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.InteropServices.ComVisible(true)>]</AttributeName>
</Attribute>
</Attributes>
<Docs>
<summary>Represents a weak reference, which references an object while still allowing that object to be reclaimed by garbage collection.</summary>
<remarks>
<format type="text/markdown"><.
## Examples
The following example demonstrates how you can use weak references to maintain a cache of objects as a resource for an application. The cache is constructed using an <xref:System.Collections.Generic.IDictionary%602> of <xref:System.WeakReference> objects keyed by an index value. The <xref:System.WeakReference.Target%2A> property for the <xref:System.WeakReference> objects is an object in a byte array that represents data.
The example randomly accesses objects in the cache. If an object is reclaimed for garbage collection, a new data object is regenerated; otherwise, the object is available to access because of the weak reference.
:::code language="csharp" source="~/snippets/csharp/System/WeakReference/Overview/program.cs" id="Snippet1":::
:::code language="fsharp" source="~/snippets/fsharp/System/WeakReference/Overview/program.fs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR/WeakReference/vb/Module1.vb" id="Snippet1":::
]]></format>
</remarks>
<altmember cref="T:System.GC" />
<related type="Article" href="/dotnet/standard/garbage-collection/weak-references">Weak References</related>
</Docs>
<Members>
<MemberGroup MemberName=".ctor">
<AssemblyInfo>
<AssemblyName>mscorlib</AssemblyName>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
</AssemblyInfo>
<Docs>
<summary>Initializes a new instance of the <see cref="T:System.WeakReference" /> class.</summary>
</Docs>
</MemberGroup>
<Member MemberName=".ctor">
<MemberSignature Language="C#" Value="public WeakReference (object target);" 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 specialname rtspecialname instance void .ctor(object target) cil managed" />
<MemberSignature Language="DocId" Value="M:System.WeakReference.#ctor(System.Object)" />
<MemberSignature Language="VB.NET" Value="Public Sub New (target As Object)" />
<MemberSignature Language="F#" Value="new WeakReference : obj -> WeakReference" Usage="new System.WeakReference target" />
<MemberSignature Language="C++ CLI" Value="public:
 WeakReference(System::Object ^ target);" />
<MemberSignature Language="C#" Value="public WeakReference (object? target);" FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-3.0;netcore-3.1" />
<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>
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<AssemblyVersion>7.0.0.0</AssemblyVersion>
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<AssemblyName>mscorlib</AssemblyName>
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<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<Parameters>
<Parameter Name="target" Type="System.Object" />
</Parameters>
<Docs>
<param name="target">The object to track or <see langword="null" />.</param>
<summary>Initializes a new instance of the <see cref="T:System.WeakReference" /> class, referencing the specified object.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
This constructor creates a short weak reference to `target`.
]]></format>
</remarks>
<altmember cref="T:System.Object" />
</Docs>
</Member>
<Member MemberName=".ctor">
<MemberSignature Language="C#" Value="public WeakReference (object target, bool trackResurrection);" 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 specialname rtspecialname instance void .ctor(object target, bool trackResurrection) cil managed" />
<MemberSignature Language="DocId" Value="M:System.WeakReference.#ctor(System.Object,System.Boolean)" />
<MemberSignature Language="VB.NET" Value="Public Sub New (target As Object, trackResurrection As Boolean)" />
<MemberSignature Language="F#" Value="new WeakReference : obj * bool -> WeakReference" Usage="new System.WeakReference (target, trackResurrection)" />
<MemberSignature Language="C++ CLI" Value="public:
 WeakReference(System::Object ^ target, bool trackResurrection);" />
<MemberSignature Language="C#" Value="public WeakReference (object? target, bool trackResurrection);" FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-3.0;netcore-3.1" />
<MemberType>Constructor</MemberType>
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<Attributes>
<Attribute FrameworkAlternate="netframework-4.0">
<AttributeName Language="C#">[System.Security.SecuritySafeCritical]</AttributeName>
<AttributeName Language="F#">[<System.Security.SecuritySafeCritical>]</AttributeName>
</Attribute>
</Attributes>
<Parameters>
<Parameter Name="target" Type="System.Object" />
<Parameter Name="trackResurrection" Type="System.Boolean" />
</Parameters>
<Docs>
<param name="target">An object to track.</param>
<param name="trackResurrection">Indicates when to stop tracking the object. If <see langword="true" />, the object is tracked after finalization; if <see langword="false" />, the object is only tracked until finalization.</param>
<summary>Initializes a new instance of the <see cref="T:System.WeakReference" /> class, referencing the specified object and using the specified resurrection tracking.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
If `trackResurrection` is `false`, a short weak reference is created. If `trackResurrection` is `true`, a long weak reference is created.
## Examples
The following example creates a cache of data objects with short weak references. This example is part of a larger example provided for the <xref:System.WeakReference> class.
:::code language="csharp" source="~/snippets/csharp/System/WeakReference/Overview/program.cs" id="Snippet2":::
:::code language="fsharp" source="~/snippets/fsharp/System/WeakReference/Overview/program.fs" id="Snippet2":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR/WeakReference/vb/Module1.vb" id="Snippet2":::
]]></format>
</remarks>
<altmember cref="T:System.Object" />
<altmember cref="T:System.Boolean" />
<altmember cref="T:System.Runtime.InteropServices.GCHandle" />
<related type="Article" href="/dotnet/standard/garbage-collection/weak-references">Weak References</related>
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<Docs>
<param name="info">An object that holds all the data needed to serialize or deserialize the current <see cref="T:System.WeakReference" /> object.</param>
<param name="context">(Reserved) Describes the source and destination of the serialized stream specified by <paramref name="info" />.</param>
<summary>Initializes a new instance of the <see cref="T:System.WeakReference" /> class, using deserialized data from the specified serialization and stream objects.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The `context` parameter is reserved, and does not currently participate in this operation.
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="info" /> is <see langword="null" />.</exception>
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<ReturnType>System.Void</ReturnType>
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<Parameters />
<Docs>
<summary>Discards the reference to the target represented by the current <see cref="T:System.WeakReference" /> object.</summary>
<remarks>To be added.</remarks>
<altmember cref="T:System.GC" />
<altmember cref="M:System.Object.Finalize" />
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<Parameter Name="info" Type="System.Runtime.Serialization.SerializationInfo" 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="context" Type="System.Runtime.Serialization.StreamingContext" 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" />
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<Docs>
<param name="info">An object that holds all the data needed to serialize or deserialize the current <see cref="T:System.WeakReference" /> object.</param>
<param name="context">(Reserved) The location where serialized data is stored and retrieved.</param>
<summary>Populates a <see cref="T:System.Runtime.Serialization.SerializationInfo" /> object with all the data needed to serialize the current <see cref="T:System.WeakReference" /> object.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
This method stores all the information in `info` necessary to serialize the current <xref:System.WeakReference> object.
The `context` parameter is reserved and is not currently used in the execution of this method.
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="info" /> is <see langword="null" />.</exception>
<altmember cref="T:System.Object" />
<altmember cref="T:System.Runtime.Serialization.SerializationInfo" />
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<MemberSignature Language="ILAsm" Value=".property instance bool IsAlive" />
<MemberSignature Language="DocId" Value="P:System.WeakReference.IsAlive" />
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<ReturnType>System.Boolean</ReturnType>
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<Docs>
<summary>Gets an indication whether the object referenced by the current <see cref="T:System.WeakReference" /> object has been garbage collected.</summary>
<value>
<see langword="true" /> if the object referenced by the current <see cref="T:System.WeakReference" /> object has not been garbage collected and is still accessible; otherwise, <see langword="false" />.</value>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
Because an object could potentially be reclaimed for garbage collection immediately after the <xref:System.WeakReference.IsAlive%2A> property returns `true`, using this property is not recommended unless you are testing only for a `false` return value.
]]></format>
</remarks>
<altmember cref="T:System.GC" />
<altmember cref="T:System.Object" />
<related type="Article" href="/dotnet/standard/garbage-collection/weak-references">Weak References</related>
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<Docs>
<summary>Gets or sets the object (the target) referenced by the current <see cref="T:System.WeakReference" /> object.</summary>
<value>
<see langword="null" /> if the object referenced by the current <see cref="T:System.WeakReference" /> object has been garbage collected; otherwise, a reference to the object referenced by the current <see cref="T:System.WeakReference" /> object.</value>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
After setting this property to the target object, make sure that there are no other strong references to the object; otherwise, it will not be collected.
## Examples
The following example tries to obtain an object from a cache of objects with weak references. If the object was reclaimed for garbage collection, a new object is generated. This example is part of a larger example provided for the <xref:System.WeakReference> class.
:::code language="csharp" source="~/snippets/csharp/System/WeakReference/Overview/program.cs" id="Snippet3":::
:::code language="fsharp" source="~/snippets/fsharp/System/WeakReference/Overview/program.fs" id="Snippet3":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR/WeakReference/vb/Module1.vb" id="Snippet3":::
]]></format>
</remarks>
<exception cref="T:System.InvalidOperationException">The reference to the target object is invalid. This exception can be thrown while setting this property if the value is a null reference or if the object has been finalized during the set operation.</exception>
<altmember cref="T:System.Object" />
<altmember cref="T:System.GC" />
<related type="Article" href="/dotnet/standard/garbage-collection/weak-references">Weak References</related>
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</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Boolean</ReturnType>
</ReturnValue>
<Docs>
<summary>Gets an indication whether the object referenced by the current <see cref="T:System.WeakReference" /> object is tracked after it is finalized.</summary>
<value>
<see langword="true" /> if the object the current <see cref="T:System.WeakReference" /> object refers to is tracked after finalization; or <see langword="false" /> if the object is only tracked until finalization.</value>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
If `true`, the weak reference is a long weak reference and `true` was specified for the `trackResurrection` parameter in the <xref:System.WeakReference> constructor.
]]></format>
</remarks>
<altmember cref="T:System.GC" />
<related type="Article" href="/dotnet/standard/garbage-collection/weak-references">Weak References</related>
</Docs>
</Member>
</Members>
</Type>