I need to use callback function to do some post procesing tasks when the function started with the Dispatcher.BeginInvoke finishes. However i could not find any parameter in Dispatcher.BeginInvoke to accept a callback. Is it possible to give a callback function to Dispatcher.BeginInvoke?
The DispatcherOperation
object returned by BeginInvoke
has a Completed
event on it. Subscribe to that to perform operations upon completion:
var dispatcherOp = Dispatcher.BeginInvoke( /* your method here */);
dispatcherOp.Completed += (s, e) => { /* callback code here */ };
There's a chance the operation will complete before you subscribe, so you can test the Status
property for completion after as well:
if (dispatcherOp.Status == DispatcherOperationStatus.Completed) { ... }
It's possible for the operation to be aborted as well, so handling/testing for Aborted
may also be appropriate.
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