ThreadHelper Class
Provides a generic dispatcher helper to ensure that a method is invoked on the application's main thread.
Inheritance Hierarchy
System.Object
Microsoft.VisualStudio.Shell.ThreadHelper
Namespace: Microsoft.VisualStudio.Shell
Assembly: Microsoft.VisualStudio.Shell.11.0 (in Microsoft.VisualStudio.Shell.11.0.dll)
Syntax
'Declaración
Public MustInherit Class ThreadHelper
public abstract class ThreadHelper
The ThreadHelper type exposes the following members.
Constructors
| Name | Description | |
|---|---|---|
.gif "Protected method") |
ThreadHelper | Initializes a new instance of ThreadHelper. |
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Properties
| Name | Description | |
|---|---|---|
.gif "Public property") .gif "Static member") |
Generic | Gets a generic ThreadHelper. |
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Methods
| Name | Description | |
|---|---|---|
.gif "Public method") |
BeginInvoke(Action) | Schedules an action for execution on the UI thread asynchronously. |
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BeginInvoke(DispatcherPriority, Action) | Schedules an action for execution on the UI thread asynchronously. |
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CheckAccess | Determines whether the call is being made on the UI thread. |
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Equals | Determines whether the specified object is equal to the current object. (Inherited from Object.) |
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Finalize | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.) |
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GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) |
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GetInvocationWrapper | Gets the invocation wrapper. |
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GetType | Gets the Type of the current instance. (Inherited from Object.) |
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Invoke(Action) | Calls an action on the UI thread, re-entering (if necessary) any code already executing on the UI thread. |
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Invoke<TResult>(Func{) | Evaluates a function on the UI thread. |
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MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
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ToString | Returns a string that represents the current object. (Inherited from Object.) |
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Remarks
We use the current application's dispatcher for convenient identification of the main thread. Note that this means that the application object must be initialized by the window manager.
However, DispatcherOperation objects are not used, because they are not compatible with RPC. For example, if the UI thread is in the middle of an RPC call, and code must run on the UI thread, then DispatcherOperation objects will not get through. This is because DispatcherOperation objects are initiated by posting a message to the UI thread, and the UI thread must dispatch that message. If the UI thread is making an RPC call, these messages will not be removed from the queue. The standard OLE message filter processes only a limited set of messages from the queue.
By going through a private service, the operation becomes a COM call on the UI thread. This operation is allowed through the Visual Studio message filter if it is part of the same logical call, since the message filter will see it as a nested call and may not reject it.
Thread Safety
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.