How to cancel an async WCF call?

Question

I have been trying some time to find out how to implement WCF call cancellation based on the new .NET 4.5 CancellationToken mechanism. All the samples I found are not WCF ba

Answer 1

As indicated before. It is impossible to cross service boundary and cancel on server side.

If you want to cancel the Task on client side you can can use the extension method WithCancellation from Microsoft.VisualStudio.Threading.ThreadingTools

It is part of Visual Studio SDK or you can also get it from Nuget.

 CancellationTokenSource ct = new CancellationTokenSource();
 ct.CancelAfter(20000);
 var asyncTask = _myService.LongOperationAsync();
 await asyncTask.WithCancellation(ct.Token);