CancellationToken.xml

<Type Name="CancellationToken" FullName="System.Threading.CancellationToken">
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      <InterfaceName>System.IEquatable&lt;System.Threading.CancellationToken&gt;</InterfaceName>
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      <AttributeName Language="C#">[System.Diagnostics.DebuggerDisplay("IsCancellationRequested = {IsCancellationRequested}")]</AttributeName>
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  <Docs>
    <summary>Propagates notification that operations should be canceled.</summary>
    <remarks>
      <format type="text/markdown"><![CDATA[  
  
## Remarks  
 A <xref:System.Threading.CancellationToken> enables cooperative cancellation between threads, thread pool work items, or <xref:System.Threading.Tasks.Task> objects. You create a cancellation token by instantiating a <xref:System.Threading.CancellationTokenSource> object, which manages cancellation tokens retrieved from its <xref:System.Threading.CancellationTokenSource.Token%2A?displayProperty=nameWithType> property. You then  pass the cancellation token to any number of threads, tasks, or operations that should receive notice of cancellation. The token cannot be used to initiate cancellation. When the owning object calls <xref:System.Threading.CancellationTokenSource.Cancel%2A?displayProperty=nameWithType>, the <xref:System.Threading.CancellationToken.IsCancellationRequested%2A> property on every copy of the cancellation token is set to `true`. The objects that receive the notification can respond in whatever manner is appropriate.  
  
 For more information and code examples see [Cancellation in Managed Threads](/dotnet/standard/threading/cancellation-in-managed-threads).  
  
   
  
## Examples  
 The following example uses a random number generator to emulate a data collection application that reads 10 integral values from eleven different instruments. A value of zero indicates that the measurement has failed for one instrument, in which case the operation should be cancelled and no overall mean should be computed.  
  
To handle the possible cancellation of the operation, the example instantiates a <xref:System.Threading.CancellationTokenSource> object that generates a cancellation token that's passed to a <xref:System.Threading.Tasks.TaskFactory> object. In turn, the <xref:System.Threading.Tasks.TaskFactory> object passes the cancellation token to each of the tasks responsible for collecting readings for a particular instrument. The <xref:System.Threading.Tasks.TaskFactory.ContinueWhenAll%60%602%28System.Threading.Tasks.Task%7B%60%600%7D%5B%5D%2CSystem.Func%7BSystem.Threading.Tasks.Task%7B%60%600%7D%5B%5D%2C%60%601%7D%2CSystem.Threading.CancellationToken%29?displayProperty=nameWithType> method is called to ensure that the mean is computed only after all readings have been gathered successfully. If a task has not completed because it was cancelled, the <xref:System.Threading.Tasks.TaskFactory.ContinueWhenAll%2A?displayProperty=nameWithType> method throws an exception.
  
 :::code language="csharp" source="~/snippets/csharp/System.Threading/CancellationToken/Overview/cancel1.cs" id="Snippet1":::
 :::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.threading.cancellationtokensource.class/vb/cancel1.vb" id="Snippet1":::  
  
 ]]></format>
    </remarks>
    <threadsafe>All public and protected members of <see cref="T:System.Threading.CancellationToken" /> are thread-safe and may be used concurrently from multiple threads.</threadsafe>
    <related type="Article" href="/dotnet/standard/threading/cancellation-in-managed-threads">Cancellation</related>
    <related type="Article" href="/dotnet/standard/parallel-programming/task-cancellation">Task Cancellation</related>
  </Docs>
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    <Member MemberName=".ctor">
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        <Parameter Name="canceled" Type="System.Boolean" />
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        <param name="canceled">The canceled state for the token.</param>
        <summary>Initializes the <see cref="T:System.Threading.CancellationToken" />.</summary>
        <remarks>
          <format type="text/markdown"><![CDATA[  
  
## Remarks  
 Tokens created with this constructor will remain in the canceled state specified by the `canceled` parameter. If `canceled` is `false`, both <xref:System.Threading.CancellationToken.CanBeCanceled%2A> and <xref:System.Threading.CancellationToken.IsCancellationRequested%2A> will be `false`.  
  
 If `canceled` is `true`, both <xref:System.Threading.CancellationToken.CanBeCanceled%2A> and <xref:System.Threading.CancellationToken.IsCancellationRequested%2A> will be `true`.  
  
 ]]></format>
        </remarks>
        <related type="Article" href="/dotnet/standard/threading/cancellation-in-managed-threads">Cancellation</related>
        <related type="Article" href="/dotnet/standard/parallel-programming/task-cancellation">Task Cancellation</related>
      </Docs>
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        <summary>Gets whether this token is capable of being in the canceled state.</summary>
        <value>
          <see langword="true" /> if this token is capable of being in the canceled state; otherwise, <see langword="false" />.</value>
        <remarks>
          <format type="text/markdown"><![CDATA[  
  
## Remarks  
 If <xref:System.Threading.CancellationToken.CanBeCanceled%2A> returns `false`, it is guaranteed that the token will never transition into a canceled state, meaning that <xref:System.Threading.CancellationToken.IsCancellationRequested%2A> will never return `true`. A cancellation token that cannot be canceled is returned by the static <xref:System.Threading.CancellationToken.None%2A?displayProperty=nameWithType> property.  
  
 You can optionally use this property to determine whether a cancellation token can be canceled before examining the value of the <xref:System.Threading.CancellationToken.IsCancellationRequested%2A> property to determine whether it has been canceled.  
  
 ]]></format>
        </remarks>
        <related type="Article" href="/dotnet/standard/threading/cancellation-in-managed-threads">Cancellation</related>
        <related type="Article" href="/dotnet/standard/parallel-programming/task-cancellation">Task Cancellation</related>
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        <summary>Determines whether the current <see cref="T:System.Threading.CancellationToken" /> instance is equal to the specified token.</summary>
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        <param name="other">The other object to compare with this instance.</param>
        <summary>Determines whether the current <see cref="T:System.Threading.CancellationToken" /> instance is equal to the specified <see cref="T:System.Object" />.</summary>
        <returns>
          <see langword="true" /> if <paramref name="other" /> is a <see cref="T:System.Threading.CancellationToken" /> and if the two instances are equal; otherwise, <see langword="false" />. See the Remarks section for more information.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[  
## Remarks  

Two cancellation tokens are equal if any one of the following conditions is true: 

- They are associated with the same <xref:System.Threading.CancellationTokenSource>.

- They were both constructed from public <xref:System.Threading.CancellationToken> constructors, and their <xref:System.Threading.CancellationToken.IsCancellationRequested?displayProperty=nameWithType> values are equal.

- The value of both cancellation tokens is <xref:System.Threading.CancellationToken.None?displayProperty=nameWithType>.

       ]]></format>
        </remarks>
        <exception cref="T:System.ObjectDisposedException">An associated <see cref="T:System.Threading.CancellationTokenSource" /> has been disposed.</exception>
        <related type="Article" href="/dotnet/standard/threading/cancellation-in-managed-threads">Cancellation</related>
        <related type="Article" href="/dotnet/standard/parallel-programming/task-cancellation">Task Cancellation</related>
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        <Parameter Name="other" Type="System.Threading.CancellationToken" />
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        <param name="other">The other <see cref="T:System.Threading.CancellationToken" /> to compare with this instance.</param>
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          <see langword="true" /> if the instances are equal; otherwise, <see langword="false" />. See the Remarks section for more information.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[  
## Remarks  

Two cancellation tokens are equal if any one of the following conditions is true: 

- They are associated with the same <xref:System.Threading.CancellationTokenSource>.

- They were both constructed from public <xref:System.Threading.CancellationToken> constructors, and their <xref:System.Threading.CancellationToken.IsCancellationRequested?displayProperty=nameWithType> values are equal.

- The value of both cancellation tokens is <xref:System.Threading.CancellationToken.None?displayProperty=nameWithType>.

       ]]></format>
        </remarks>
        <related type="Article" href="/dotnet/standard/threading/cancellation-in-managed-threads">Cancellation</related>
        <related type="Article" href="/dotnet/standard/parallel-programming/task-cancellation">Task Cancellation</related>
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          <format type="text/markdown"><![CDATA[  
  
## Remarks  
 This property indicates whether cancellation has been requested for this token, either through the token initially being constructed in a canceled state, or through calling <xref:System.Threading.CancellationTokenSource.Cancel%2A> on the token's associated <xref:System.Threading.CancellationTokenSource>.  
  
 If this property is `true`, it only guarantees that cancellation has been requested. It does not guarantee that every registered handler has finished executing, nor that cancellation requests have finished propagating to all registered handlers. Additional synchronization may be required, particularly in situations where related objects are being canceled concurrently.  
  
   
  
## Examples  
 The following is a simple example that executes a server process until the <xref:System.Threading.CancellationToken.IsCancellationRequested%2A> property returns `true`.  
  
 :::code language="csharp" source="~/snippets/csharp/System.Threading/CancellationToken/IsCancellationRequested/cancellation.cs" id="Snippet12":::
 :::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/System.Threading.Tasks.CancellationToken.IsCancellationRequested/vb/cancelthreads.vb" id="Snippet12":::  
  
 The example instantiates a <xref:System.Threading.CancellationTokenSource> object, which controls access to the cancellation token. It then defines two thread procedures. The first is defined as a lambda expression that pools the keyboard and, when the "C" key is pressed, calls <xref:System.Threading.CancellationTokenSource.Cancel%2A?displayProperty=nameWithType> to set the cancellation token to the cancelled state. The second is a parameterized method, `ServerClass.StaticMethod`, that executes a loop until the <xref:System.Threading.CancellationToken.IsCancellationRequested%2A> property is `true`.  
  
 The main thread then starts the two threads and blocks until the thread that executes the `ServerClass.StaticMethod` method terminates.  
  
 ]]></format>
        </remarks>
        <related type="Article" href="/dotnet/standard/threading/cancellation-in-managed-threads">Cancellation</related>
        <related type="Article" href="/dotnet/standard/parallel-programming/task-cancellation">Task Cancellation</related>
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          <format type="text/markdown"><![CDATA[  
  
## Remarks  
 The cancellation token returned by this property cannot be canceled; that is, its <xref:System.Threading.CancellationToken.CanBeCanceled%2A> property is `false`.  
  
 You can also use the C#  [default(CancellationToken)](/dotnet/csharp/language-reference/keywords/default) statement to create an empty cancellation token. 

 Two empty cancellation tokens are always equal.
  
 ]]></format>
        </remarks>
        <related type="Article" href="/dotnet/standard/threading/cancellation-in-managed-threads">Cancellation</related>
        <related type="Article" href="/dotnet/standard/parallel-programming/task-cancellation">Task Cancellation</related>
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        <Parameter Name="right" Type="System.Threading.CancellationToken" />
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        <remarks>
          <format type="text/markdown"><![CDATA[  
## Remarks  

Two cancellation tokens are equal if any one of the following conditions is true: 

- They are associated with the same <xref:System.Threading.CancellationTokenSource>.

- They were both constructed from public <xref:System.Threading.CancellationToken> constructors, and their <xref:System.Threading.CancellationToken.IsCancellationRequested?displayProperty=nameWithType> values are equal.

- The value of both cancellation tokens is <xref:System.Threading.CancellationToken.None?displayProperty=nameWithType>.
       ]]></format>
        </remarks>
        <exception cref="T:System.ObjectDisposedException">An associated <see cref="T:System.Threading.CancellationTokenSource" /> has been disposed.</exception>
        <related type="Article" href="/dotnet/standard/threading/cancellation-in-managed-threads">Cancellation</related>
        <related type="Article" href="/dotnet/standard/parallel-programming/task-cancellation">Task Cancellation</related>
      </Docs>
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## Remarks  

For the definition of equality, see the <xref:System.Threading.CancellationToken.Equals%2A> method. 
       ]]></format>
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        <related type="Article" href="/dotnet/standard/threading/cancellation-in-managed-threads">Cancellation</related>
        <related type="Article" href="/dotnet/standard/parallel-programming/task-cancellation">Task Cancellation</related>
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        <related type="Article" href="/dotnet/standard/threading/cancellation-in-managed-threads">Cancellation</related>
        <related type="Article" href="/dotnet/standard/parallel-programming/task-cancellation">Task Cancellation</related>
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      </Parameters>
      <Docs>
        <param name="callback">The delegate to be executed when the <see cref="T:System.Threading.CancellationToken" /> is canceled.</param>
        <summary>Registers a delegate that will be called when this <see cref="T:System.Threading.CancellationToken" /> is canceled.</summary>
        <returns>The <see cref="T:System.Threading.CancellationTokenRegistration" /> instance that can be used to unregister the callback.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[  
  
## Remarks  
 If this token is already in the canceled state, the delegate will be run immediately and synchronously. Any exception the delegate generates will be propagated out of this method call.  
  
 The current <xref:System.Threading.ExecutionContext> is captured along with the delegate and will be used when executing it. 

 The current <xref:System.Threading.SynchronizationContext> is not captured.
 
 ]]></format>
        </remarks>
        <exception cref="T:System.ObjectDisposedException">The associated <see cref="T:System.Threading.CancellationTokenSource" /> has been disposed.</exception>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="callback" /> is null.</exception>
        <related type="Article" href="/dotnet/standard/threading/cancellation-in-managed-threads">Cancellation</related>
        <related type="Article" href="/dotnet/standard/parallel-programming/task-cancellation">Task Cancellation</related>
        <related type="Article" href="/dotnet/standard/threading/how-to-register-callbacks-for-cancellation-requests">How to: Register Callbacks for Cancellation Requests</related>
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        <param name="useSynchronizationContext">A value that indicates whether to capture the current <see cref="T:System.Threading.SynchronizationContext" /> and use it when invoking the <paramref name="callback" />.</param>
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        <returns>The <see cref="T:System.Threading.CancellationTokenRegistration" /> instance that can be used to unregister the callback.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[  
  
## Remarks  
 If this token is already in the canceled state, the delegate will be run immediately and synchronously. Any exception the delegate generates will be propagated out of this method call.  
  
 The current <xref:System.Threading.ExecutionContext> is captured along with the delegate and will be used when executing it. 

 If `useSynchronizationContext` is `true`, the current <xref:System.Threading.SynchronizationContext>, if one exists, is also captured along with the delegate and will be used when executing it. Otherwise, <xref:System.Threading.SynchronizationContext> is not captured.
  
 ]]></format>
        </remarks>
        <exception cref="T:System.ObjectDisposedException">The associated <see cref="T:System.Threading.CancellationTokenSource" /> has been disposed.</exception>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="callback" /> is null.</exception>
        <related type="Article" href="/dotnet/standard/threading/cancellation-in-managed-threads">Cancellation</related>
        <related type="Article" href="/dotnet/standard/parallel-programming/task-cancellation">Task Cancellation</related>
        <related type="Article" href="/dotnet/standard/threading/how-to-register-callbacks-for-cancellation-requests">How to: Register Callbacks for Cancellation Requests</related>
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        <summary>Registers a delegate that will be called when this <see cref="T:System.Threading.CancellationToken">CancellationToken</see> is canceled.</summary>
        <returns>The <see cref="T:System.Threading.CancellationTokenRegistration" /> instance that can be used to unregister the callback.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks

If this token is already in the canceled state, the delegate will be run immediately and synchronously. Any exception the delegate
generates will be propagated out of this method call. The current <xref:System.Threading.ExecutionContext>, if one exists,
is captured along with the delegate and is used when executing it. The current <xref:System.Threading.SynchronizationContext> is not captured.

          ]]></format>
        </remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="callback" /> is <see langword="null" />.</exception>
      </Docs>
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        <ReturnType>System.Threading.CancellationTokenRegistration</ReturnType>
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        <param name="callback">The delegate to be executed when the <see cref="T:System.Threading.CancellationToken" /> is canceled.</param>
        <param name="state">The state to pass to the <paramref name="callback" /> when the delegate is invoked. This may be null.</param>
        <summary>Registers a delegate that will be called when this <see cref="T:System.Threading.CancellationToken" /> is canceled.</summary>
        <returns>The <see cref="T:System.Threading.CancellationTokenRegistration" /> instance that can be used to unregister the callback.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[  
  
## Remarks  
 If this token is already in the canceled state, the delegate will be run immediately and synchronously. Any exception the delegate generates will be propagated out of this method call.  
  
 The current <xref:System.Threading.ExecutionContext> is captured along with the delegate and will be used when executing it. 

 The current <xref:System.Threading.SynchronizationContext> is not captured.
  
 ]]></format>
        </remarks>
        <exception cref="T:System.ObjectDisposedException">The associated <see cref="T:System.Threading.CancellationTokenSource" /> has been disposed.</exception>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="callback" /> is null.</exception>
        <related type="Article" href="/dotnet/standard/threading/cancellation-in-managed-threads">Cancellation</related>
        <related type="Article" href="/dotnet/standard/parallel-programming/task-cancellation">Task Cancellation</related>
        <related type="Article" href="/dotnet/standard/threading/how-to-register-callbacks-for-cancellation-requests">How to: Register Callbacks for Cancellation Requests</related>
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        <returns>The <see cref="T:System.Threading.CancellationTokenRegistration" /> instance that can be used to unregister the callback.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[  
  
## Remarks  
 If this token is already in the canceled state, the delegate will be run immediately and synchronously. Any exception the delegate generates will be propagated out of this method call.  
  
 The current <xref:System.Threading.ExecutionContext> is captured along with the delegate and will be used when executing it. 

 If `useSynchronizationContext` is `true`, the current <xref:System.Threading.SynchronizationContext>, if one exists, is also captured along with the delegate and will be used when executing it. Otherwise, <xref:System.Threading.SynchronizationContext> is not captured.
  
 ]]></format>
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        <exception cref="T:System.ArgumentNullException">
          <paramref name="callback" /> is null.</exception>
        <related type="Article" href="/dotnet/standard/threading/cancellation-in-managed-threads">Cancellation</related>
        <related type="Article" href="/dotnet/standard/parallel-programming/task-cancellation">Task Cancellation</related>
        <related type="Article" href="/dotnet/standard/threading/how-to-register-callbacks-for-cancellation-requests">How to: Register Callbacks for Cancellation Requests</related>
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        <summary>Throws a <see cref="T:System.OperationCanceledException" /> if this token has had cancellation requested.</summary>
        <remarks>
          <format type="text/markdown"><![CDATA[  
  
## Remarks  
 This method provides functionality equivalent to:  
  
 C#  
  
```csharp  
if (token.IsCancellationRequested)   
    throw new OperationCanceledException(token);  
```  
  
```vb  
If token.IsCancellationRequested Then  
    Throw New OperationCanceledException(token)  
End If  
```  
  
 ]]></format>
        </remarks>
        <exception cref="T:System.OperationCanceledException">The token has had cancellation requested.</exception>
        <related type="Article" href="/dotnet/standard/threading/cancellation-in-managed-threads">Cancellation</related>
        <related type="Article" href="/dotnet/standard/parallel-programming/task-cancellation">Task Cancellation</related>
        <related type="Article" href="/dotnet/standard/parallel-programming/how-to-cancel-a-task-and-its-children">How to: Cancel a Task and Its Children</related>
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        <ReturnType>System.Threading.CancellationTokenRegistration</ReturnType>
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        <Parameter Name="callback" Type="System.Action&lt;System.Object,System.Threading.CancellationToken&gt;" Index="0" FrameworkAlternate="net-6.0;net-7.0;net-8.0;net-9.0;net-10.0">
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        <Parameter Name="state" Type="System.Object" Index="1" FrameworkAlternate="net-6.0;net-7.0;net-8.0;net-9.0;net-10.0" />
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        <param name="callback">The delegate to be executed when the <see cref="T:System.Threading.CancellationToken">CancellationToken</see> is canceled.</param>
        <param name="state">The state to pass to the <paramref name="callback" /> when the delegate is invoked.  This may be <see langword="null" />.</param>
        <summary>Registers a delegate that will be called when this <see cref="T:System.Threading.CancellationToken">CancellationToken</see> is canceled.</summary>
        <returns>The <see cref="T:System.Threading.CancellationTokenRegistration" /> instance that can be used to unregister the callback.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks

If this token is already in the canceled state, the delegate will be run immediately and synchronously. Any exception the delegate
generates is propagated out of this method call. <xref:System.Threading.ExecutionContext> is not captured or flowed to the callback's invocation.

          ]]></format>
        </remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="callback" /> is <see langword="null" />.</exception>
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        <param name="callback">The delegate to execute when the <see cref="T:System.Threading.CancellationToken" /> is canceled.</param>
        <param name="state">The state to pass to the <paramref name="callback" /> when the delegate is invoked.  This may be <see langword="null" />.</param>
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            be used to unregister the callback.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[
            If this token is already in the canceled state, the delegate is run immediately and synchronously.
            Any exception the delegate generates is propagated out of this method call.
            
The  <xref:System.Threading.ExecutionContext> is not captured or flowed
            to the callback's invocation.
            ]]></format>
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      <MemberSignature Language="VB.NET" Value="Public ReadOnly Property WaitHandle As WaitHandle" />
      <MemberSignature Language="F#" Value="member this.WaitHandle : System.Threading.WaitHandle" Usage="System.Threading.CancellationToken.WaitHandle" />
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      <AssemblyInfo>
        <AssemblyName>System.Runtime</AssemblyName>
        <AssemblyVersion>4.2.0.0</AssemblyVersion>
        <AssemblyVersion>4.2.1.0</AssemblyVersion>
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        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
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        <AssemblyVersion>10.0.0.0</AssemblyVersion>
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      <Attributes>
        <Attribute FrameworkAlternate="net-10.0;net-8.0;net-9.0">
          <AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(1)]</AttributeName>
          <AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(1)&gt;]</AttributeName>
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        <ReturnType>System.Threading.WaitHandle</ReturnType>
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        <summary>Gets a <see cref="T:System.Threading.WaitHandle" /> that is signaled when the token is canceled.</summary>
        <value>A <see cref="T:System.Threading.WaitHandle" /> that is signaled when the token is canceled.</value>
        <remarks>
          <format type="text/markdown"><![CDATA[  
  
## Remarks  
 Accessing this property causes a <xref:System.Threading.WaitHandle> to be instantiated. It is preferable to only use this property when necessary, and to then dispose the associated <xref:System.Threading.CancellationTokenSource> instance at the earliest opportunity (disposing the source will dispose of this allocated handle). The handle should not be closed or disposed directly.  
  
 ]]></format>
        </remarks>
        <exception cref="T:System.ObjectDisposedException">The associated <see cref="T:System.Threading.CancellationTokenSource" /> has been disposed.</exception>
        <related type="Article" href="/dotnet/standard/threading/cancellation-in-managed-threads">Cancellation</related>
        <related type="Article" href="/dotnet/standard/parallel-programming/task-cancellation">Task Cancellation</related>
        <related type="Article" href="/dotnet/standard/threading/how-to-listen-for-cancellation-requests-that-have-wait-handles">How to: Listen for Cancellation Requests That Have Wait Handles</related>
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