how to give callback function to the Dispatcher.BeginInvoke

Question

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?

dlev · Accepted Answer · 2011-09-08 20:59:04Z

13

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.

answered Sep 8, 2011 at 20:59

dlev

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1 Comment

Henry C Over a year ago

Note that this is not available on Windows Phone 7, 8 and Silverlight :(

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