前文讲到WP8中使用Async执行HTTP请求，用了微软提供的扩展。下面提供了一种方法，自己实现HttpWebRequest的扩展。
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namespace
HttpExtensions{ public
static class WebRequestExtensions { public
async static
Task<WebResponse> GetResponseAsync(this
HttpWebRequest request) { var
tcs = new
TaskCompletionSource<WebResponse>(); try { request.BeginGetResponse((ar) => { var
response = request.EndGetResponse(ar); tcs.SetResult(response); }, null); } catch
(WebException we) { tcs.SetException(we); } return
await tcs.Task; } public
async static
Task<WebResponse> GetResponseAsync(this
HttpWebRequest request, string
post) { var
tcs = new
TaskCompletionSource<WebResponse>(); try { request.BeginGetRequestStream((arReq) => { var
stream = request.EndGetRequestStream(arReq); using
(StreamWriter writer = new
StreamWriter(stream)) { writer.Write(post); writer.Flush(); } request.BeginGetResponse((ar) => { var
response = request.EndGetResponse(ar); tcs.SetResult(response); }, null); }, null); } catch
(WebException we) { tcs.SetException(we); } return
await tcs.Task; } }} |
随后就可以使用 await HttpWebRequest.GetResponseAsync() 轻松使用http请求了。
原文http://blog.liubaicai.com/?p=280
WP8中使用async/await扩展HttpWebRequest,布布扣,bubuko.com
WP8中使用async/await扩展HttpWebRequest
原文：http://www.cnblogs.com/liubaicai/p/3644522.html