Provides services for managing the queue of work items for a thread.
Assembly: System.Windows (in System.Windows.dll)
Thetype exposes the following members.
|BeginInvoke(Action)||Executes the specified delegate asynchronously on the thread the is associated with.|
|BeginInvoke(Delegate, Object())||Executes the specified delegate asynchronously with the specified array of arguments on the thread the is associated with.|
|CheckAccess||Determines whether the calling thread is the thread associated with this .|
|Equals(Object)||Determines whether the specified Object is equal to the current Object. (Inherited from Object.)|
|Finalize||Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)|
|GetHashCode||Serves as a hash function for a particular type. (Inherited from Object.)|
|GetType||Gets the Type of the current instance. (Inherited from Object.)|
|MemberwiseClone||Creates a shallow copy of the current Object. (Inherited from Object.)|
|ToString||Returns a string that represents the current object. (Inherited from Object.)|
The class currently provides support only for running code on the user interface (UI) thread from a non-UI thread.
You can access the object for the UI thread through the DependencyObject.Dispatcher and ScriptObject.Dispatcher properties. These are instance methods, but instances of these types are frequently inaccessible from non-UI threads. However, the application's Deployment object is a DependencyObject, and it is available on any thread through its Current property.
You can call the CheckAccess method to determine whether the caller is on the UI thread. If the caller is not on the UI thread, you can call BeginInvoke to run the specified delegate on the UI thread.
The following code example demonstrates how to use this class.
Private Delegate Sub AddTextDelegate(ByVal p As Panel, ByVal text As String) Private Sub AddText(ByVal p As Panel, ByVal text As String) p.Children.Clear() Dim t As New TextBlock t.Text = text p.Children.Add(t) End Sub Private Sub TestBeginInvokeWithParameters(ByVal p As Panel) If p.Dispatcher.CheckAccess() _ Then AddText(p, "Added directly.") _ Else p.Dispatcher.BeginInvoke(New AddTextDelegate( _ AddressOf AddText), p, "Added by Dispatcher.") End Sub
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.