Async CTP - 如何使用 async/await 调用 wcf 服务? [英] Async CTP - How can I use async/await to call a wcf service?

问题描述

如果我调用 WCF 服务方法，我会这样做:

If I call a WCF service method I would do something like this:

proxy.DoSomethingAsync();
proxy.DoSomethingAsyncCompleted += OnDoSomethingAsyncCompleted;

如何使用新的 async ctp 做同样的事情?我想我需要像 proxy.DoSomethingTaskAsync 或 proxy.DoSomethingAsync().ToTask() 之类的东西?Web 服务调用需要返回一个 Task 才能使用 await 关键字，但是如何??

How could I do the same using the new async ctp? I guess I would need something like proxy.DoSomethingTaskAsync or proxy.DoSomethingAsync().ToTask()? The web service call needs to return a Task<T> to be able to use the await keyword, but how??

推荐答案

在 CTP 中有工厂方法可以将常规 APM 函数(开始/结束)转换为与新的 async 关键字兼容的函数，例如实例:

In the CTP there are factory methods that do the work of turning regular APM functions (Begin/End) into ones that are compatible with the new async keyword, for instance:

Stream s = new FileStream("C:	est.txt", FileMode.CreateNew);
byte []buffer = new byte[100];
int numBytesRead = await Task<int>.Factory.FromAsync(s.BeginRead, s.EndRead, buffer, 0, buffer.Length, null);

因此，在您的情况下，您可以执行等效操作，然后您可以像这样调用它:

So in your case you can do the equivalent and then you'd then call it like so:

async proxy.DoSomethingTaskAsync()

请参阅此主题CTP讨论组以获取更多信息

See this thread on the CTP discussion group for more info

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