o_19mgorv9t13a3ko71fev19l81mqa.pdf

namespace ControllerExtensibility.Controllers {
public class RemoteDataController : Controller {
public async Task Data() {
string data = await Task.Factory.StartNew(() => {
return new RemoteService().GetRemoteData();
});
}
}
}
return View((object)data);
I have refactored the action method so that it returns a Task, applied the async and await
keywords, and created a Task, which is responsible for calling the GetRemoteData method.
Consuming Asynchronous Methods in a Controller
You can also use an asynchronous controller to consume asynchronous methods elsewhere in your application. To demonstrate
this, I have added an asynchronous method to the RemoteService class, as shown in Listing 19-29.
Listing 19-29. Adding an Asynchronous Method in the RemoteService.cs File
using System.Threading;
using System.Threading.Tasks;
namespace ControllerExtensibility.Models {
public class RemoteService {
public string GetRemoteData() {
Thread.Sleep(2000);
return "Hello from the other side of the world";
}
}
}
public async Task GetRemoteDataAsync() {
return await Task.Factory.StartNew(() => {
Thread.Sleep(2000);
return "Hello from the other side of the world";
});
}
The result from the GetRemoteDataAsync method is a Task, which yields the same message as the
synchronous method when it is completed. In Listing 19-30, you can see how I have consumed this asynchronous method in a
new action method that I added to the RemoteData controller.
Listing 19-30. Consuming Asynchronous Methods in the RemoteData Controller
using System.Web.Mvc;
using ControllerExtensibility.Models;
using System.Threading.Tasks;
527