在C＃中异步修改 [英] Async modifier in C#

问题描述

我有问题，就是这两种方法之间的区别？

I have the question, what is the difference between these two methods?

    async private void Button_Click_1(object sender, RoutedEventArgs e)
    {
        Thread.Sleep(2000);
    }

    private void Button_Click_2(object sender, RoutedEventArgs e)
    {
        Thread.Sleep(2000);
    }

他们都挡住了我的UI。我知道我必须开始另一个线程避免阻塞，但我发现：

Both of them block my UI. I know that I must start another thread to avoid blocking, but I have found:

异步方法提供了一种方便的方法做可能会长时间运行的工作，而不会阻塞调用者线程。

"An async method provides a convenient way to do potentially long-running work without blocking the caller's thread".

我有点糊涂了。

推荐答案

添加异步，本身并没有什么其他的不是让方法体使用的await 关键字。一个正确实施的异步方法不会阻塞UI线程，但不正确实现的一个肯定能

Adding async, by itself, does nothing other than allow the method body to use the await keyword. A properly implemented async method won't block the UI thread, but an improperly implemented one most certainly can.

什么你可能想要做的是这样的：

What you probably wanted to do was this:

async private void Button_Click_1(object sender, RoutedEventArgs e)
{
    await Task.Delay(2000);
    MessageBox.Show("All done!");
}

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