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