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DispatcherExtensions.BeginInvoke Method (Dispatcher, Action, DispatcherPriority)

Executes the specified delegate asynchronously with the specified priority on the thread that the specified Dispatcher was created on.

Namespace:  System.Windows.Threading
Assembly:  System.Windows.Presentation (in System.Windows.Presentation.dll)

public static DispatcherOperation BeginInvoke(
	this Dispatcher dispatcher,
	Action action,
	DispatcherPriority priority


Type: System.Windows.Threading.Dispatcher

The dispatcher that executes the delegate.

Type: System.Action

The delegate to execute, which takes no arguments and does not return a value.

Type: System.Windows.Threading.DispatcherPriority

The execution priority of the delegate relative to other pending operations in the Dispatcher event queue.

Return Value

Type: System.Windows.Threading.DispatcherOperation
An IAsyncResult object that represents the result of the BeginInvoke operation.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type Dispatcher. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).


action is null.


priority is not a valid DispatcherPriority.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5 SP1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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