异步，在Visual Studio 2010中等待

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我在VS2010和VS2012中都运行了以下代码，但VS2012只返回了响应.然后我搜索发现，需要在VS2010中启用异步并等待. 然后通过使用AsyncCtpLibrary dll参考，我已启用它.但是vs2010仍然不会返回响应.

I ran the below code in both VS2010 and VS2012, but VS2012 only return the response.Then i searched and found, needs to enable the async and await in VS2010. Then by using AsyncCtpLibrary dll reference, i have enabled it. But still vs2010 does not return the response.

static void Main(string[] args) { Task<string> task = GetCustomerDetails(); //PushCustomerDetails(); task.Wait(); var x = task.Result; } static async Task<string> GetCustomerDetails() { var httpClientHandler = new HttpClientHandler() { Credentials=new NetworkCredential("demo","demo"), }; var httpClient = new HttpClient(httpClientHandler); httpClient.DefaultRequestHeaders.Accept.Clear(); httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json")); var result1 = await httpClient.GetStringAsync("URL") return result1.ToString(); }

推荐答案

VS2010编译器不了解async/await.您需要安装异步CTP才能使用更新的编译器更新VS2010.

The VS2010 compiler has no knowledge of async/await. You need to install the Async CTP in order to update VS2010 with a newer compiler.

不幸的是，七年前，Visual Studio安装程序技术远远落后于当今. Async CTP安装程序的行为类似于VS更新，因此每次发布新的VS更新时，安装程​​序都会中断.然后，异步团队将不得不释放另一个安装程序，以使异步CTP再次运行.

Unfortunately, 7 years ago the Visual Studio installer technology was far behind where it is today. The Async CTP installer acted like a VS update, so it would break each time a new VS update was released. The async team would then have to release another installer for the Async CTP to work again.

AFAIK，此循环从未完成，并且最新的VS2010仍与异步CTP不兼容.因此，不再可以构建带有异步功能的VS2010构建机器.

AFAIK, this cycle was never completed, and the latest VS2010 remains incompatible with the Async CTP. Thus, it is no longer possible to construct a VS2010-with-async build machine.