C# WebException.GetType方法代码示例

        private void CheckWebException(WebException exception)
        {
            Trace.Call(exception == null ? null : exception.GetType());

            switch (exception.Status) {
                case WebExceptionStatus.ConnectFailure:
                case WebExceptionStatus.ConnectionClosed:
                case WebExceptionStatus.Timeout:
                case WebExceptionStatus.ReceiveFailure:
                case WebExceptionStatus.NameResolutionFailure:
                case WebExceptionStatus.ProxyNameResolutionFailure:
                    // ignore temporarly issues
            #if LOG4NET
                    f_Logger.Warn("CheckWebException(): ignored exception", exception);
            #endif
                    return;
            }

            /*
            http://apiwiki.twitter.com/HTTP-Response-Codes-and-Errors
            * 200 OK: Success!
            * 304 Not Modified: There was no new data to return.
            * 400 Bad Request: The request was invalid.  An accompanying error
            *     message will explain why. This is the status code will be
            *     returned during rate limiting.
            * 401 Unauthorized: Authentication credentials were missing or
            *     incorrect.
            * 403 Forbidden: The request is understood, but it has been
            *     refused.  An accompanying error message will explain why.
            *     This code is used when requests are being denied due to
            *     update limits.
            * 404 Not Found: The URI requested is invalid or the resource
            *     requested, such as a user, does not exists.
            * 406 Not Acceptable: Returned by the Search API when an invalid
            *     format is specified in the request.
            * 500 Internal Server Error: Something is broken.  Please post to
            *     the group so the Twitter team can investigate.
            * 502 Bad Gateway: Twitter is down or being upgraded.
            * 503 Service Unavailable: The Twitter servers are up, but
            *     overloaded with requests. Try again later. The search and
            *     trend methods use this to indicate when you are being rate
            *     limited.
            */
            HttpWebResponse httpRes = exception.Response as HttpWebResponse;
            if (httpRes == null) {
                throw exception;
            }
            switch (httpRes.StatusCode) {
                case HttpStatusCode.BadGateway:
                case HttpStatusCode.BadRequest:
                case HttpStatusCode.Forbidden:
                case HttpStatusCode.ServiceUnavailable:
                case HttpStatusCode.GatewayTimeout:
                    // ignore temporarly issues
            #if LOG4NET
                    f_Logger.Warn("CheckWebException(): ignored exception", exception);
            #endif
                    return;
                default:
                    throw exception;
            }
        }

            public void HandleTwitterWebException(WebException e, String prefix)
            {
                HttpWebResponse response = (HttpWebResponse)e.Response;
                String protcol = (response == null) ? "" : "HTTP/" + response.ProtocolVersion;

                String error = String.Empty;
                //try reading JSON response
                if (response != null && response.ContentType != null && response.ContentType.ToLower().Contains("json"))
                {
                    try
                    {
                        StreamReader sin = new StreamReader(response.GetResponseStream());
                        String data = sin.ReadToEnd();
                        sin.Close();

                        Hashtable jdata = (Hashtable)JSON.JsonDecode(data);
                        if (jdata == null || !jdata.ContainsKey("error") ||
                            jdata["error"] == null || !jdata["error"].GetType().Equals(typeof(String)))
                            throw new Exception();

                        error = "Twitter Error: " + (String)jdata["error"] + ", ";
                    }
                    catch (Exception ex)
                    {
                    }
                }

                /* Handle Time-Out Gracefully */
                if (e.Status.Equals(WebExceptionStatus.Timeout))
                {
                    plugin.ConsoleException("Twitter " + prefix + " Request(" + protcol + ") timed-out");
                    return;
                }
                else if (e.Status.Equals(WebExceptionStatus.ProtocolError))
                {
                    plugin.ConsoleException("Twitter " + prefix + " Request(" + protcol + ") failed, " + error + " " + e.GetType() + ": " + e.Message);
                    return;
                }
                else
                    throw e;
            }

        protected ExtApiCallResult HandleWebException(WebException ex)
        {
            var httpResponse = (HttpWebResponse)ex.Response;

            if (httpResponse != null)
            {
                return new ExtApiCallResult
                {
                    StatusCode = httpResponse.StatusCode,
                    ResponseStream = httpResponse.GetResponseStream(),
                    FinalUrl = httpResponse.ResponseUri.AbsoluteUri
                };
            }

            // else
            var stream = new MemoryStream();
            var msg = System.Text.Encoding.ASCII.GetBytes(string.Format("{0}: {1}", ex.GetType().ToString(), ex.Message));
            stream.Write(msg, 0, msg.Length);

            return new ExtApiCallResult
            {
                StatusCode = HttpStatusCode.NoContent,
                ResponseStream = stream,
                FinalUrl = httpResponse.ResponseUri.AbsoluteUri
            };
        }