![]() ![]() Objects that derive from Freezable are free-threaded when they are frozen. Objects that derive from DispatcherObject have thread affinity. If BeginInvoke is called on a Dispatcher that has shut down, the status property of the returned DispatcherOperation is set to Aborted.Īll of the methods on Dispatcher, with the exception of DisableProcessing, are free-threaded. The operation is added to the queue of the Dispatcher at the specified DispatcherPriority. Invoke is synchronous and BeginInvoke is asynchronous. This is accomplished by using either Invoke or BeginInvoke. In order for the background thread to access the Content property of the Button, the background thread must delegate the work to the Dispatcher associated with the UI thread. Ai dispatcher run 8 v2 update#For example, a background thread cannot update the contents of a Button that is associated with the Dispatcher on the UI thread. In WPF, a DispatcherObject can only be accessed by the Dispatcher it is associated with. If a Dispatcher is shut down, it cannot be restarted. If you create a Dispatcher on a background thread, be sure to shut down the dispatcher before exiting the thread. A Dispatcher is also created when you create a DispatcherObject. ![]() If you attempt to get the CurrentDispatcher for the current thread and a Dispatcher is not associated with the thread, a Dispatcher will be created. When a Dispatcher is created on a thread, it becomes the only Dispatcher that can be associated with the thread, even if the Dispatcher is shut down. The Dispatcher maintains a prioritized queue of work items for a specific thread. (DispatcherPriority.Normal, New NextPrimeDelegate(AddressOf CheckNextNumber)) This call to BeginInvoke(DispatcherPriority, Delegate) takes two parameters: the priority, which is set to DispatcherPriority.Normal, and the callback, which is passed in through an instance of the delegate NextPrimeDelegate. Next, BeginInvoke(DispatcherPriority, Delegate) is called. public delegate void NextPrimeDelegate() For the full source code of this example, see Single-Threaded Application with Long-Running Calculation Sample.įirst, a delegate is created that accepts no arguments. Ai dispatcher run 8 v2 how to#The following example shows how to place an operation onto a Dispatcher. ![]()
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