private void BeginGetRequestStreamCallback(IAsyncResult asyncResult)
{
Stream requestStream = null;
HttpWebRequestAsyncState asyncState = null;
try
{
asyncState = (HttpWebRequestAsyncState)asyncResult.AsyncState;
requestStream = asyncState.HttpWebRequest.EndGetRequestStream(asyncResult);
requestStream.Write(asyncState.RequestBytes, 0, asyncState.RequestBytes.Length);
requestStream.Close();
IAsyncResult result = asyncState.HttpWebRequest.BeginGetResponse(BeginGetResponseCallback,
new HttpWebRequestAsyncState
{
HttpWebRequest = asyncState.HttpWebRequest,
ResponseCallback = asyncState.ResponseCallback,
State = asyncState.State
});
// Timeout comes here
ThreadPool.RegisterWaitForSingleObject(result.AsyncWaitHandle, new WaitOrTimerCallback(TimeOutCallback), asyncState.HttpWebRequest, 30000, true);
}
catch (Exception ex)
{
if (asyncState != null)
{
asyncState.ResponseCallback(new HttpWebRequestCallbackState(ex));
}
else
{
throw;
}
}
finally
{
if (requestStream != null)
{
requestStream.Close();
}
}
}
private void BeginGetResponseCallback(IAsyncResult asyncResult)
{
WebResponse webResponse = null;
Stream responseStream = null;
HttpWebRequestAsyncState asyncState = null;
try
{
asyncState = (HttpWebRequestAsyncState)asyncResult.AsyncState;
webResponse = asyncState.HttpWebRequest.EndGetResponse(asyncResult);
responseStream = webResponse.GetResponseStream();
var webRequestCallbackState = new HttpWebRequestCallbackState(responseStream, asyncState.State);
asyncState.ResponseCallback(webRequestCallbackState);
responseStream.Close();
responseStream = null;
webResponse.Close();
webResponse = null;
}
catch (Exception ex)
{
if (asyncState != null)
{
asyncState.ResponseCallback(new HttpWebRequestCallbackState(ex));
}
else
{
throw;
}
}
finally
{
if (responseStream != null)
{
responseStream.Close();
}
if (webResponse != null)
{
webResponse.Close();
}
}
}
/// <summary>
/// This method does an Http POST sending any post parameters to the url provided
/// </summary>
/// <param name="url">The url to make an Http POST to</param>
/// <param name="postParameters">The form parameters if any that need to be POSTed</param>
/// <param name="responseCallback">The callback delegate that should be called when the response returns from the remote server</param>
/// <param name="state">Any state information you need to pass along to be available in the callback method when it is called</param>
/// <param name="contentType">The Content-Type of the Http request</param>
public void PostAsync(string url, NameValueCollection postParameters, Action <HttpWebRequestCallbackState> responseCallback)
{
object state = null;
string contentType = "application/x-www-form-urlencoded";
var httpWebRequest = CreateHttpWebRequest(url, "POST", contentType);
var requestBytes = GetRequestBytes(postParameters);
httpWebRequest.ContentLength = requestBytes.Length;
HttpWebRequestAsyncState httpWebRequestAsyncState = new HttpWebRequestAsyncState()
{
RequestBytes = requestBytes,
HttpWebRequest = httpWebRequest,
ResponseCallback = responseCallback,
State = state
};
IAsyncResult result = httpWebRequest.BeginGetRequestStream(BeginGetRequestStreamCallback, httpWebRequestAsyncState);
m_requestState = httpWebRequestAsyncState;
ThreadPool.RegisterWaitForSingleObject(result.AsyncWaitHandle, new WaitOrTimerCallback(TimeOutCallback), httpWebRequest, 30000, true);
}
