c# - Async CTP - How can I use async/await to call a wcf service?

Question

If I call a WCF service method I would do something like this:

proxy.DoSomethingAsync();
proxy.DoSomethingAsyncCompleted += OnDoSomethingAsyncCompleted;

How could I do the same using the new async ctp? I guess I would need something like proxy.DoSomethingTaskAsync or proxy.DoSomethingAsync().ToTask()? The web service call needs to return a Task<T> to be able to use the await keyword, but how??

Answer 1

In the CTP there are factory methods that do the work of turning regular APM functions (Begin/End) into ones that are compatible with the new async keyword, for instance:

Stream s = new FileStream("C:est.txt", FileMode.CreateNew);
byte []buffer = new byte[100];
int numBytesRead = await Task<int>.Factory.FromAsync(s.BeginRead, s.EndRead, buffer, 0, buffer.Length, null);

So in your case you can do the equivalent and then you'd then call it like so:

async proxy.DoSomethingTaskAsync()

See this thread on the CTP discussion group for more info