If my interface must return Task what is the best way to have a no-operation implementation?

Question

In the code below, due to the interface, the class LazyBar must return a task from its method (and for argument\'s sake can\'t be changed). If LazyBar

Answer 1

I prefer the Task completedTask = Task.CompletedTask; solution of .Net 4.6, but another approach is to mark the method async and return void:

    public async Task WillBeLongRunningAsyncInTheMajorityOfImplementations()
    {
    }

You'll get a warning (CS1998 - Async function without await expression), but this is safe to ignore in this context.