how to call wcf service asynchronously from MVC4's controller - wcf

Question

I created a project that have WCF service and client consume it asynchronously
(like the one in http://msdn.microsoft.com/en-us/library/bb885132.aspx)
The problem comes with me if the client is MVC4
When I call the wcf from client-side, the code is
ChannelFactory<IMathService> myChannelFactory =
new ChannelFactory<IMathService>(myBinding, myEndpoint);
myChannelFactory.Open();
IMathService instance = myChannelFactory.CreateChannel();
// Call Service.
IAsyncResult ar = instance.BeginFunction(param,
(are) =>
{
result = ((IMathService)are.AsyncState).EndFunction(are);
}
, instance);
return View(result);
With this code, my "result" is always default value.
How can I make the action wait until the result has value from EndFunction?
Thanks

Answer 1

You need to use ASP .NET MVC AsyncController
Full explanation - http://msdn.microsoft.com/en-us/library/ee728598(v=vs.98).aspx
Edited sample for your scenario-
public class PortalController : AsyncController {
public void NewsAsync(string city) {
AsyncManager.OutstandingOperations.Increment();
ChannelFactory<IMathService> myChannelFactory =
new ChannelFactory<IMathService>(myBinding, myEndpoint);
myChannelFactory.Open();
IMathService instance = myChannelFactory.CreateChannel();
// Call Service.
IAsyncResult ar = instance.BeginFunction(param,
(are) =>
{
AsyncManager.Parameters["result"] = ((IMathService)are.AsyncState).EndFunction(are);
AsyncManager.OutstandingOperations.Decrement();
}
, instance);
}
public ActionResult NewsCompleted(string[] result) {
return View(result);
}
}