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AsyncCallback.xml
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<Type Name="AsyncCallback" FullName="System.AsyncCallback">
<TypeSignature Language="C#" Value="public delegate void AsyncCallback(IAsyncResult ar);" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi sealed AsyncCallback extends System.MulticastDelegate" 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.AsyncCallback" />
<TypeSignature Language="VB.NET" Value="Public Delegate Sub AsyncCallback(ar As IAsyncResult)" />
<TypeSignature Language="F#" Value="type AsyncCallback = delegate of IAsyncResult -> unit" />
<TypeSignature Language="C++ CLI" Value="public delegate void AsyncCallback(IAsyncResult ^ ar);" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi serializable sealed AsyncCallback extends System.MulticastDelegate" 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.Delegate</BaseTypeName>
</Base>
<Attributes>
<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.ComVisible(true)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.InteropServices.ComVisible(true)>]</AttributeName>
</Attribute>
</Attributes>
<Parameters>
<Parameter Name="ar" Type="System.IAsyncResult" />
</Parameters>
<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Docs>
<param name="ar">The result of the asynchronous operation.</param>
<summary>References a method to be called when a corresponding asynchronous operation completes.</summary>
<remarks>
<format type="text/markdown">< and [Using an AsyncCallback Delegate and State Object](/dotnet/standard/asynchronous-programming-patterns/using-an-asynccallback-delegate-and-state-object) in [Event-based Asynchronous Pattern (EAP)](/dotnet/standard/asynchronous-programming-patterns/event-based-asynchronous-pattern-eap).
## Examples
The following code example demonstrates using asynchronous methods in the <xref:System.Net.Dns> class to retrieve Domain Name System (DNS) information for user-specified computers. This example creates an <xref:System.AsyncCallback> delegate that references the `ProcessDnsInformation` method. This method is called once for each asynchronous request for DNS information.
:::code language="csharp" source="~/snippets/csharp/System/AsyncCallback/Overview/AsyncDelegateNoStateObject.cs" id="Snippet4":::
:::code language="fsharp" source="~/snippets/fsharp/VS_Snippets_CLR/AsyncDesignPattern/FS/AsyncDelegateNoStateObject.fs" id="Snippet4":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR/AsyncDesignPattern/VB/AsyncDelegateNoState.vb" id="Snippet4":::
]]></format>
</remarks>
<altmember cref="T:System.IAsyncResult" />
<related type="Article" href="/dotnet/standard/asynchronous-programming-patterns/using-an-asynccallback-delegate-to-end-an-asynchronous-operation">Using an AsyncCallback Delegate to End an Asynchronous Operation</related>
<related type="Article" href="/dotnet/standard/asynchronous-programming-patterns/using-an-asynccallback-delegate-and-state-object">Using an AsyncCallback Delegate and State Object</related>
<related type="Article" href="/dotnet/standard/asynchronous-programming-patterns/calling-synchronous-methods-asynchronously">Calling Synchronous Methods Asynchronously</related>
<related type="Article" href="/dotnet/standard/asynchronous-programming-patterns/event-based-asynchronous-pattern-eap">Event-based Asynchronous Pattern (EAP)</related>
<related type="Article" href="/dotnet/standard/events/">Handling and Raising Events</related>
</Docs>
</Type>