private static void OnException(StateContainer states, Exception exception)
{
if (exception != null)
{
if (states.RequesteStream != null)
{
states.RequesteStream.Close();
}
if (states.OnError != null)
{
states.OnError(exception);
}
}
}
internal static void RequestCallback(IAsyncResult result)
{
StateContainer states = (StateContainer)result.AsyncState;
try
{
states.RequesteStream = states.Request.EndGetRequestStream(result);
states.RequesteStream.BeginWrite(states.RequestContent, 0, states.RequestContent.Length, WriteCallback, states);
}
catch (Exception e)
{
if (states.OnError != null)
{
states.OnError(e);
}
}
}
internal static void WriteCallback(IAsyncResult result)
{
StateContainer states = (StateContainer)result.AsyncState;
try
{
states.RequesteStream.EndWrite(result);
states.RequesteStream.Close();
states.Request.BeginGetResponse(ResponseCallback, states);
}
catch (Exception e)
{
if (states.OnError != null)
{
states.OnError(e);
}
}
}
internal static void ResponseCallback(IAsyncResult result)
{
StateContainer states = (StateContainer)result.AsyncState;
try
{
WebResponse response = states.Request.EndGetResponse(result);
using (Stream stream = response.GetResponseStream())
{
const int BufferLength = 8096;
byte[] buffer = new byte[BufferLength];
string responseString;
using (MemoryStream ms = new MemoryStream())
{
int bytesRead;
while ((bytesRead = stream.Read(buffer, 0, BufferLength)) > 0)
{
ms.Write(buffer, 0, bytesRead);
}
ms.Flush();
responseString = Encoding.UTF8.GetString(ms.ToArray());
}
if (states.OnComplete != null)
{
states.OnComplete(responseString);
}
}
}
catch (Exception e)
{
if (states.OnError != null)
{
states.OnError(e);
}
}
}