async一直等待异步

Question

我是c#异步等待机制的新手.我一直在阅读一些关于异步的文章(http://blog.stephencleary.com/2012/07/dont-block-on-async-code.html).我在下面有一个例子,如果第Initialize一种方法会导致死锁,为什么还能告诉我？先感谢您.

public class Test {

    public  async  Task DoSomeWorkAsync() {
      await DoSomeWork1Async(); 
    }

    // This method is mixed with Wait and async await, will this cause lead lock?
    public void Initialize() {
      Task.Run(() => DoSomeWorkAsync()).Wait();
    }

    // This method is following async all the way
    public async Task InitializeAsync()  {
      await DoSomeWorkAsync();
    }

}

// Update: Here is the context where two Initialize methods are called
public class TestForm : Form {
  // Load Form UI
  public async void OnLoad() {
    var test = new Test();
    test.Initialize();
    await test.InitializeAsync();
  }
}

Answer 1

不,这不会死锁,因为你正在阻止一个没有的ThreadPool线程执行SynchronizationContext的任务.由于它没有在UI线程上运行,因此没有任何事情可以阻止该任务完成,因此没有死锁.

如果这是你的代码,它将陷入僵局:

public void Initialize()
{
    DoSomeWorkAsync().Wait();
}

这仍然不是阻止的好理由,你应该使用async-await all up up up.