使用与异步方法秒表 [英] Using the Stopwatch with Async methods

问题描述

我有一些code如下：

I have some code as follows:

public void Start()
{
    var watch = new Stopwatch();
    watch.Start();

    Task.Factory.StartNew(MyMethod1);
    Task.Factory.StartNew(MyMethod2);

    watch.Stop();
    Log(watch.ElapsedMilliseconds);
    Task.Factory.StartNew(MyMethod3);
}

由于MyMethod1和MyMethod2被称为异步watch.Stop（）被调用在错误的时间。我怎样才能确保.Stop被调用和MyMethod1和MyMethod2结束后记录但确保MyMethod3不必等待。

Because MyMethod1 and MyMethod2 are called Asynchronously watch.Stop() gets called at the wrong time. How I can ensure that .Stop gets called and logged after MyMethod1 and MyMethod2 finish BUT ensure that MyMethod3 does not have to wait.

我要保留所有的秒表功能，在我的start（）方法，并没有记录在我的任何3种方法，即MyMethod1，MyMethod2和MyMethod3

I want to keep all Stopwatch functionality in my Start() method and not have the logging in any of my 3 methods i.e. MyMethod1, MyMethod2 and MyMethod3

推荐答案

您可以使用 Task.Factory.ContinueWhenAll 方法。

watch.Start();
var t1 = Task.Factory.StartNew(MyMethod1);
var t2 = Task.Factory.StartNew(MyMethod2);
Task.Factory.ContinueWhenAll(new [] {t1, t2}, tasks => watch.Stop());

如果你的目标为.NET 4.5和上，你也可以使用该方法 Task.WhenAll 。它返回一个任务将完成，当所有的传递任务的对象已经完成。

If you're targeting for .NET 4.5 and upper, you can also use the method Task.WhenAll. It returns a task that will complete when all of the passed Task objects have completed.

Task.WhenAll(t1, t2).ContinueWith(t => watch.Stop());

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