private static void HttpAsyncRequest_TimeoutCallback(object state, bool timedOut)
{
if (timedOut)
{
HttpAsyncRequestState requestState = state as HttpAsyncRequestState;
if (requestState != null)
{
requestState.Request.Abort();
}
}
}
private static void HttpAsyncRequest_RespCallback(IAsyncResult asyncResult)
{
WebResponse resp = null;
HttpAsyncRequestState requestState = null;
try
{
string result = null;
requestState = asyncResult.AsyncState as HttpAsyncRequestState;
resp = requestState.Request.EndGetResponse(asyncResult);
using (StreamReader sr = new StreamReader(resp.GetResponseStream(), requestState.RespEncoding))
{
result = sr.ReadToEnd();
sr.Close();
}
if (requestState.RespResult != null)
{
requestState.RespResult(result, resp, null);
}
}
catch (Exception ex)
{
if (requestState != null && requestState.RespResult != null)
{
requestState.RespResult(null, resp, ex);
}
}
finally
{
if (resp != null)
{
resp.Close();
resp = null;
}
}
}
public static void HttpAsyncRequest(HttpWebRequest request, Encoding responseEncoding, int timeoutInSecond, ResponseResult responseResult)
{
HttpAsyncRequestState requestState = new HttpAsyncRequestState()
{
Request = request,
RespResult = responseResult,
RespEncoding = responseEncoding,
};
try
{
// Start the asynchronous request.
IAsyncResult asyncResult = request.BeginGetResponse(HttpAsyncRequest_RespCallback, requestState);
ThreadPool.RegisterWaitForSingleObject(asyncResult.AsyncWaitHandle, new WaitOrTimerCallback(HttpAsyncRequest_TimeoutCallback), requestState, timeoutInSecond * 1000, true);
}
catch (WebException ex)
{
if (requestState.RespResult != null)
{
requestState.RespResult(null, ex.Response as HttpWebResponse, ex);
}
}
}
