HttpWebRequest不知道是神马情况


 //回调验证证书问题
        public bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
        {
            // 总是接受    
            return true;
        }
        ///<summary>
        ///采用https协议访问网络
        ///</summary>
        ///<param name="URL">url地址</param>
        ///<param name="strPostdata">发送的数据</param>
        ///<returns></returns>
        public string OpenReadWithHttps(string URL, string strPostdata, string strEncoding)
        {
            
            // 这一句一定要写在创建连接的前面。使用回调的方法进行证书验证。
           ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(CheckValidationResult);
            Encoding encoding = Encoding.Default;
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(URL);            //创建证书文件
            X509Certificate objx509 = new X509Certificate(@"D:\ExampleProject\pushIphone\pushIphone\cer\xx.pem","xxx");            //加载Cookie
            request.CookieContainer = new CookieContainer();            //添加到请求里
            request.ClientCertificates.Add(objx509);
            request.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)";
            request.Method = "POST";
            request.Accept = "text/html, application/xhtml+xml, */*";
            request.ContentType = "application/x-www-form-urlencoded";
            byte[] buffer = encoding.GetBytes(strPostdata);
            request.ContentLength = buffer.Length;
            request.GetRequestStream().Write(buffer, 0, buffer.Length);
            /***Send the data. **/
            //Stream newStream = request.GetRequestStream();
            //newStream.Write(buffer, 0, buffer.Length);[code=csharp]
            //newStream.Close();
            
           
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            using (StreamReader reader = new StreamReader(response.GetResponseStream(), System.Text.Encoding.GetEncoding(strEncoding)))
            {
                return reader.ReadToEnd();
            }
        }
[/code]
调用情况如下:string postData = "{\"aps\":{\"alert\":\"發送信息\",\"badge\":1,\"sound\":\"default\",\"when\":\"這是發生了什么?\"}}";string str = OpenReadWithHttps("https://gateway.sandbox.push.apple.com:2195", postData, "utf-8");
Response.Write(str);
Response.End();
出现错误如下:要求已經中止: 無法建立 SSL/TLS 的安全通道。 
描述: 在執行目前 Web 要求的過程中發生未處理的例外情形。請檢閱堆疊追蹤以取得錯誤的詳細資訊，以及在程式碼中產生的位置。 例外詳細資訊: System.Net.WebException: 要求已經中止: 無法建立 SSL/TLS 的安全通道。原始程式錯誤: 
行 80:             byte[] buffer = encoding.GetBytes(strPostdata);
行 81:             request.ContentLength = buffer.Length;
行 82:             request.GetRequestStream().Write(buffer, 0, buffer.Length);
行 83:             /***Send the data. **/
行 84:             //Stream newStream = request.GetRequestStream();
 
//已执行了这句，不知道为什么还错~~~
 ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(CheckValidationResult);