如何使＆QUOT;老式＆QUOT;异步方法awaitable [英] How to make an "old style" async method awaitable

问题描述

如果我有一个异步方法有回调

If I have an asynchronous method with a callback

MyMethodAsync( <Input Parameters ...>, Callback);

我怎样才能使它awaitable？

how can I make it awaitable?

[此方法对于Windows Phone 7的，但应同样适用于任何类似的C＃构造]

[This method is for windows phone 7, but should be equally applicable to any similar c# construct]

DNSEndpoint Endpoint = ...
NameResolutionCallback Callback = (nrr) => { ... }
DeviceNetworkInformation.ResolveHostNameAsync(Enpoint, Callback, null);

我想提出一个awaitable包装解决这个电话，让我等待回调到下一个命令完成后再继续。

I want to put an awaitable wrapper around this call, so I wait for the callback to complete before continuing with the next command.

推荐答案

您可以使用<一个href=\"http://msdn.microsoft.com/en-us/library/dd449174.aspx\"><$c$c>TaskCompletionSource:

var tcs = new TaskCompletionSource<TypeOfCallbackParameter>();

MyMethodAsync(..., r => tcs.SetResult(r));

return tcs.Task;

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