The underlying connection was closed:Could not establish trust relationship for the SSL/TLS secure

Asp.Net 用webrequest获取资源时，报“The underlying connection was closed:Could not establish trust relationship for the SSL/TLS secure channel.”的错。后面发现我请求的url地址是https的，和普通的http站点不同。

解决方案;

 在请求资源代码前加上如下代码即可：

 

ServicePointManager.ServerCertificateValidationCallback +=
            delegate(
               object sender,
               X509Certificate certificate,
               X509Chain chain,
               SslPolicyErrors sslPolicyErrors)
            {
                return true;
            };

请求资源代码：

 HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create(url);
            HttpWebResponse myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse();
            Stream receiveStream = myHttpWebResponse.GetResponseStream();
            string imageType = myHttpWebResponse.GetResponseHeader("Content-disposition").Split(';')[1].Split('.')[1].Trim('"');
            string fileName= Guid.NewGuid().ToString() + "." + imageType;
            string filePath = saveFilePath + "/" +fileName;
            byte[] buffer = new byte[1024];
            int len = 0;
            FileStream fs = new FileStream(filePath, FileMode.Create);
            while ((len = receiveStream.Read(buffer, 0, buffer.Length)) > 0)
            {
                fs.Write(buffer, 0, len);
            }
            fs.Close();