.NET Framework Class Library
CancellationToken Structure

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Propogates notification that operations should be canceled.

Namespace:  System.Threading
Assembly:  mscorlib (in mscorlib.dll)
Syntax
Visual Basic (Declaration) 
<ComVisibleAttribute(False)> _
<HostProtectionAttribute(SecurityAction.LinkDemand, Synchronization := True,  _
    ExternalThreading := True)> _
Public Structure CancellationToken
Visual Basic (Usage) 
Dim instance As CancellationToken
C# 
[ComVisibleAttribute(false)]
[HostProtectionAttribute(SecurityAction.LinkDemand, Synchronization = true, 
    ExternalThreading = true)]
public struct CancellationToken
Visual C++ 
[ComVisibleAttribute(false)]
[HostProtectionAttribute(SecurityAction::LinkDemand, Synchronization = true, 
    ExternalThreading = true)]
public value class CancellationToken
F# 
[<SealedAttribute>]
[<ComVisibleAttribute(false)>]
[<HostProtectionAttribute(SecurityAction.LinkDemand, Synchronization = true, 
    ExternalThreading = true)>]
type CancellationToken =  struct end
Remarks
NoteNote

The HostProtectionAttribute attribute applied to this type or member has the following Resources property value: Synchronization | ExternalThreading. The HostProtectionAttribute does not affect desktop applications (which are typically started by double-clicking an icon, typing a command, or entering a URL in a browser). For more information, see the HostProtectionAttribute class or SQL Server Programming and Host Protection Attributes.
Thread Safety

All public and protected members of CancellationTokenRegistration are thread-safe and may be used concurrently from multiple threads, with the exception of Dispose, which must only be used when all other operations on the CancellationTokenRegistration have completed.
Platforms

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
Version Information

.NET Framework

Supported in: 4

.NET Framework Client Profile

Supported in: 4
See Also

Reference

CancellationToken Members
System.Threading Namespace

Other Resources

Cancellation
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