/// <summary>
/// Do asynchronous web post.
/// Register EndAsyncResponse and callback method.
/// </summary>
/// <param name="state">Async Web method state</param>
private void EndAsyncRequest(IAsyncResult state)
{
AsyncWebMethodRequest input = state.AsyncState as AsyncWebMethodRequest;
try
{
WebRequest request = input.Request;
Stream requestStream = request.EndGetRequestStream(state);
ASCIIEncoding encoding = new ASCIIEncoding();
byte[] postBytes = encoding.GetBytes(input.PostData);
requestStream.Write(postBytes, 0, postBytes.Length);
requestStream.Close();
request.BeginGetResponse(EndAsyncResponse, input);
}
catch (Exception ex)
{
AsyncWebMethodResponse asyncResponse = new AsyncWebMethodResponse(input.State);
asyncResponse.StatusDescription = ex.Message;
if (ex.InnerException != null)
{
asyncResponse.StatusDescription = string.Format(CultureInfo.InvariantCulture,
"{0}\n{1}",
asyncResponse.StatusDescription,
ex.InnerException.Message);
}
asyncResponse.Status = AsyncMethodState.Failed;
asyncResponse.Error = ex;
input.Callback(asyncResponse);
}
}
/// <summary>
/// Read asynchronous web response.
/// Invoke the callback method to report completion.
/// </summary>
/// <param name="state">Async Web method state</param>
private void EndAsyncResponse(IAsyncResult state)
{
AsyncWebMethodRequest input = state.AsyncState as AsyncWebMethodRequest;
AsyncWebMethodResponse asyncResponse = new AsyncWebMethodResponse(input.State);
try
{
WebRequest request = input.Request;
HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(state);
asyncResponse.StatusDescription = response.StatusDescription;
if (asyncResponse.StatusDescription == "OK")
{
asyncResponse.Result = response.GetResponseStream();
asyncResponse.Status = AsyncMethodState.Passed;
}
else
{
asyncResponse.Status = AsyncMethodState.Passed;
}
}
catch (WebException we)
{
HttpWebResponse response = (HttpWebResponse)we.Response;
if (response == null)
{
asyncResponse.StatusDescription = string.Format(CultureInfo.InvariantCulture,
"{0}{1}",
asyncResponse.StatusDescription,
we.Message);
if (we.InnerException != null)
{
asyncResponse.StatusDescription = string.Format(CultureInfo.InvariantCulture,
"{0}\n{1}",
asyncResponse.StatusDescription,
we.InnerException.Message);
}
}
else
{
asyncResponse.StatusDescription = string.Format(CultureInfo.InvariantCulture,
"{0}WebException: {1}",
asyncResponse.StatusDescription,
response.StatusDescription);
}
asyncResponse.Status = AsyncMethodState.Failed;
asyncResponse.Error = we;
}
catch (Exception ex)
{
asyncResponse.StatusDescription = ex.Message;
if (ex.InnerException != null)
{
asyncResponse.StatusDescription = string.Format(CultureInfo.InvariantCulture,
"{0}\n{1}",
asyncResponse.StatusDescription,
ex.InnerException.Message);
}
asyncResponse.Status = AsyncMethodState.Failed;
asyncResponse.Error = ex;
}
input.Callback(asyncResponse);
}
/// <summary>
/// This method instantiates and invokes asynchronous web call.
/// Create the web request object and do a Async call
/// 1. If post data is required register EndAsyncRequest as callback.
/// 2. Otherwise register EndAsyncResponse as callback method.
/// </summary>
/// <param name="input">Input parameters</param>
public void BeginAsyncRequest(AsyncWebMethodRequest input)
{
if (input == null)
{
throw new ArgumentNullException("input");
}
AsyncWebMethodResponse asyncResponse = new AsyncWebMethodResponse(input.State);
try
{
WebRequest request = null;
if (string.IsNullOrEmpty(input.PostData))
{
string queryString = BuildQueryString(input.Parameter);
request = CreateGetRequest(input.Url, queryString, input.Credential);
Close(); // get rid of any old response
input.Request = request;
request.BeginGetResponse(EndAsyncResponse, input);
}
else
{
request = CreatePostRequest(input.Url, input.Credential, input.PostData.Length);
input.Request = request;
request.BeginGetRequestStream(EndAsyncRequest, input);
}
}
catch (WebException we)
{
HttpWebResponse response = (HttpWebResponse)we.Response;
if (response == null)
{
asyncResponse.StatusDescription = string.Format(CultureInfo.InvariantCulture,
"{0}{1}",
asyncResponse.StatusDescription,
we.Message);
if (we.InnerException != null)
{
asyncResponse.StatusDescription = string.Format(CultureInfo.InvariantCulture,
"{0}\n{1}",
asyncResponse.StatusDescription,
we.InnerException.Message);
}
}
else
{
asyncResponse.StatusDescription = string.Format(CultureInfo.InvariantCulture,
"{0}WebException: {1}",
asyncResponse.StatusDescription,
response.StatusDescription);
}
asyncResponse.Status = AsyncMethodState.Failed;
asyncResponse.Error = we;
input.Callback(asyncResponse);
}
catch (Exception ex)
{
asyncResponse.StatusDescription = ex.Message;
if (ex.InnerException != null)
{
asyncResponse.StatusDescription = string.Format(CultureInfo.InvariantCulture,
"{0}\n{1}",
asyncResponse.StatusDescription,
ex.InnerException.Message);
}
asyncResponse.Status = AsyncMethodState.Failed;
asyncResponse.Error = ex;
input.Callback(asyncResponse);
}
}
