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DispatcherExtensions.Invoke Method (Dispatcher, Action, TimeSpan, DispatcherPriority)

Executes the specified delegate synchronously with the specified priority on the thread that the specified Dispatcher was created on, and stops execution after the specified time-out period.

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

public static void Invoke(
	this Dispatcher dispatcher,
	Action action,
	TimeSpan timeout,
	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.TimeSpan
The maximum time to wait for the operation to finish.
Type: System.Windows.Threading.DispatcherPriority
The execution priority of the delegate relative to other pending operations in the Dispatcher event queue.

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 equal to Inactive.


priority is not a valid DispatcherPriority.

.NET Framework

Supported in: 4, 3.5 SP1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.