예제 #1
0
        /// <summary>
        /// This method does an Http GET to the provided url and calls the responseCallback delegate
        /// providing it with the response returned from the remote server.
        /// </summary>
        /// <param name="url">The url to make an Http GET to</param>
        /// <param name="timeout">The timeout.</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 static void GetAsync(string url, TimeSpan timeout, Action<HttpWebRequestCallbackState> responseCallback, object state = null, string contentType = "application/x-www-form-urlencoded")
        {
            HttpWebRequest httpWebRequest;
            try
            {
                httpWebRequest = CreateHttpWebRequest(url, "GET", contentType);
            }
            catch (Exception ex)
            {
                Log.WarnFormat("Exception creating WebRequest for url: {0}", ex, url);
                responseCallback(new HttpWebRequestCallbackState(ex, state));
                return;
            }

            var requestState = new HttpWebRequestAsyncState
                {
                    HttpWebRequest = httpWebRequest,
                    ResponseCallback = responseCallback,
                    State = state
                };

            #if DISABLE_ASYNC
            ProcessRequest(requestState);
            #else
            var result = httpWebRequest.BeginGetResponse(BeginGetResponseCallback, requestState);

            ThreadPool.RegisterWaitForSingleObject(result.AsyncWaitHandle, TimeOutCallback, httpWebRequest, timeout, true);
            #endif
        }
예제 #2
0
        /// <summary>
        /// Begins the get response callback.
        /// </summary>
        /// <param name="asyncResult">The async result.</param>
        private static 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((HttpWebResponse)webResponse, asyncState.State);
                asyncState.ResponseCallback(webRequestCallbackState);
                responseStream.Close();
                responseStream = null;
                webResponse.Close();
                webResponse = null;
            }
            catch (Exception ex)
            {
                if (asyncState != null)
                {
                    Log.WarnFormat("Exception requesting url: {0}", ex, asyncState.HttpWebRequest.RequestUri);
                    asyncState.ResponseCallback(new HttpWebRequestCallbackState(ex, asyncState.State));
                }
                else
                {
                    Log.Warn("BeginGetResponseCallback", ex);
                    throw;
                }
            }
            finally
            {
                if (responseStream != null)
                {
                    responseStream.Close();
                }
                if (webResponse != null)
                {
                    webResponse.Close();
                }
            }
        }
예제 #3
0
        static void ProcessRequest(HttpWebRequestAsyncState asyncState)
        {
            WebResponse webResponse = null;
            Stream responseStream = null;
            try
            {
                webResponse = asyncState.HttpWebRequest.GetResponse();
                responseStream = webResponse.GetResponseStream();
                var webRequestCallbackState = new HttpWebRequestCallbackState((HttpWebResponse)webResponse, asyncState.State);
                asyncState.ResponseCallback(webRequestCallbackState);
                if (responseStream != null)
                    responseStream.Close();

                responseStream = null;
                webResponse.Close();
                webResponse = null;
            }
            catch (Exception ex)
            {
                if (asyncState != null)
                {
                    Log.WarnFormat("Exception requesting url: {0}", ex, asyncState.HttpWebRequest.RequestUri);
                    asyncState.ResponseCallback(new HttpWebRequestCallbackState(ex, asyncState.State));
                }
                else
                {
                    Log.Warn("BeginGetResponseCallback", ex);
                    throw;
                }
            }
            finally
            {
                if (responseStream != null)
                    responseStream.Close();
                if (webResponse != null)
                    webResponse.Close();
            }
        }