Question

I’ve been using C# for quite a while, but somehow have not yet had the pleasure of using the whole await/async thing new in .Net 4. Well, now I’m making a console application that links to the WinRT libraries and WinRT is really.. well, asynchronous.

One thing I’m needing to do right now is install a package. So, I use PackageManager.AddPackageAsync This is of course asynchonous and returns an IAsyncOperationWithProgress

I know I could do something like

bool Done=false;
void Foo()
{
    var tmp=new PackageManager.AddPackageAsync(...);
    tmp.Completed= ... FooBar;
    while(!Done){}
}
void FooBar(...)
{
    Done=true;
}

But I’m pretty sure the whole async and await thing was designed for exactly this scenario. However, I don’t understand how to use it in this context on an IAsyncOperationWithProgress

Answer 1

.Net includes a GetAwaiter() extension method that makes IAsyncOperationWithProgress awaitable.
You can just write await tmp; in an async method.

Your async method will return a Task (or Task<T>), which you can await from another async method, or call Wait() to synchronously block.