有时候实现一些接口类的全部方法，某些方法里必须返回一个task，创建一个新任务又怕开销太大，搜了一下，发现下面是一个比较常见的做法
return Task.FromResult(null);
如果用DotNet 4.6的话，就更简单了，直接返回Task.CompletedTask就可以了。
https://msdn.microsoft.com/en-us/library/system.threading.tasks.task.completedtask.aspx
133 thoughts on “C#实现接口类的时候返回一个完成的Task对象”
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