当等待空任务时方法“做”是什么？

Question

I am outlining a class and to keep myself happy I have made a temporary return for a method

public override Task DoPostProcessing()
{
    return Task.Factory.StartNew(() => { ;} );
}

If I were to call this method and await it, what "happens"? Is this Task optimized away at compile time or is it ran?

Answer 1

It is run. It will schedule a method on a thread pool that just returns immediately.

On a side note, do not use StartNew ; it is dangerous . Use Task.Run to run code on a thread pool thread, or just use Task.FromResult to return an already-completed task. Task.FromResult should be your go-to choice for noop implementations.