.NET async/await: in this case should I return something?

Question

In a case like this, where my task could return instantly because of certain conditions:

public async Task Test(List<int> TestList)
{
    if (TestList.Count() == 0)
        return;

    // Do something
    await UploadListAsync(TestList);
}

Is it correct return;, should I use Task.FromResult(false);, or is there a more correct way?

Answer 1

When you're using an async, you can't return a Task explicitly (see edit) - the return value has been boxed up by the compiler to be the return value of the Task. Thus, your async methods should behave like other methods and return if they need to bail out of logic early.

EDIT: The one time you CAN return a Task during an async is if the return type is Task<Task..., however this would still be returning the inner Task, not the outer, since the compiler has done the same wrapping. This should also be a fairly rare use case as opposed to await-ing a chain of Tasks