我在发出 Web 请求时尝试使用 Async 和 Await,但我发现它永远不会超过 await 行.我是通过 Metro 应用程序执行此操作的,但我也在 winforms 应用程序中验证了问题.
I am trying to use Async and Await when making a web request and am finding that it never gets past the await line. I am doing this from a Metro app, but I also verified the problem in a winforms app.
public async Task<string> DoSomething() { string url = "imgur/gallery/VcBfl.json"; HttpWebRequest request = HttpWebRequest.CreateHttp(url); var ws = await request.GetResponseAsync(); return ws.ResponseUri.ToString(); ; }如果我不使用 await 而是执行同步等待,它可以工作,但我需要它异步运行.
If I don't use await and instead perform a synchronous wait, it works, but I need this to run asynchronously.
我在这段代码中遗漏了什么导致等待永远不会返回?
What am I missing in this code that is causing the await to never return?
推荐答案我怀疑你的调用堆栈更进一步,你要么在调用 Wait 要么 Result返回任务.这将导致死锁,正如我在我的博客中描述的那样.
I suspect that further up your call stack, you're either calling Wait or Result on the returned Task. This will cause a deadlock, as I describe on my blog.
遵循这些最佳做法以避免死锁:
Follow these best practices to avoid the deadlock:
更多推荐
使用 HttpWebRequest.GetResponseAsync 进行异步和等待
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