Turn event into a async call

Question

I\'m wrapping a library for my own use. To get a certain property I need to wait for an event. I\'m trying to wrap that into an async call.

Basically, I want to turn

Answer 1

Thats where TaskCompletionSource comes into play. There is little room for the new async keyword here. Example:

Task GetBarAsync()
{
    TaskCompletionSource resultCompletionSource = new TaskCompletionSource();

    foo = new Foo();
    foo.Initialized += OnFooInit;
    foo.Initialized += delegate
    {
        resultCompletionSource.SetResult(foo.Bar);
    };
    foo.Start();

    return resultCompletionSource.Task;
}

Sample use (with fancy async)

async void PrintBar()
{
    // we can use await here since bar returns a Task of string
    string bar = await GetBarAsync();

    Console.WriteLine(bar);
}