void GetRequestStreamAsyncCallback(IAsyncResult ar)
{
HttpAsyncResult httpAsyncResult = ar.AsyncState as HttpAsyncResult;
try
{
using (Stream requestStream = httpAsyncResult.Request.EndGetRequestStream(ar))
{
requestStream.Write(httpAsyncResult.PostData, 0, httpAsyncResult.PostData.Length);
requestStream.Flush();
}
httpAsyncResult.Request.BeginGetResponse(new AsyncCallback(GetResponseCallback), httpAsyncResult);
}
catch (Exception ex)
{
if (httpAsyncResult.Callback != null)
{
HttpRequestResult httpRequestResult = new HttpRequestResult()
{
Code = -1, Data = null, Message = ex.Message
};
httpAsyncResult.Callback(httpRequestResult, httpAsyncResult.RequestState);
}
}
}
protected void PostAsync(string url, byte[] data, Action <HttpRequestResult, object> callback, object requestState, Action <HttpWebRequest> preHandler = null)
{
string contentType = GetContentType();
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
if (preHandler != null)
{
preHandler(request);
}
request.ContentType = contentType;
request.KeepAlive = true;
request.Method = WebRequestMethods.Http.Post;
request.ContentLength = data.Length;
HttpAsyncResult httpAsyncResult = new HttpAsyncResult(callback, data, requestState);
httpAsyncResult.Request = request;
try
{
request.BeginGetRequestStream(GetRequestStreamAsyncCallback, httpAsyncResult);
}
catch (Exception ex)
{
if (callback != null)
{
HttpRequestResult httpRequestResult = new HttpRequestResult()
{
Code = -1, Data = null, Message = ex.Message
};
callback(httpRequestResult, httpAsyncResult.RequestState);
}
}
}
void GetResponseCallback(IAsyncResult ar)
{
HttpAsyncResult httpAsyncResult = ar.AsyncState as HttpAsyncResult;
string result = null;
int statusCode = -1;
string message = null;
try
{
HttpWebResponse webResponse = httpAsyncResult.Request.EndGetResponse(ar) as HttpWebResponse;
using (Stream s = webResponse.GetResponseStream())
{
StreamReader reader = new StreamReader(s, Encoding.UTF8);
result = reader.ReadToEnd();
statusCode = (int)webResponse.StatusCode;
}
}
catch (WebException wex)
{
HttpWebResponse resp = (HttpWebResponse)wex.Response;
message = wex.Message;
if (resp != null)
{
statusCode = (int)resp.StatusCode;
}
}
catch (Exception ex)
{
message = ex.Message;
}
if (httpAsyncResult.Callback != null)
{
HttpRequestResult httpRequestResult = new HttpRequestResult()
{
Code = statusCode, Data = result, Message = message
};
httpAsyncResult.Callback(httpRequestResult, httpAsyncResult.RequestState);
}
}
