关于解决 请求被停止：没法创建SSL / TLS安全通道

我使用HttpWebRequest访问其余网站时,出现"请求被停止：没法创建 SSL / TLS安全通道"错误,因而goog和百度了一番,提供的答案基本 是:ServicePointManager.ServerCertificateValidationCallback写委托

public ResponseModel GetHtml( string url) {   ServicePointManager.ServerCertificateValidationCallback = ValidateServerCertificate;   HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);   }   private bool ValidateServerCertificate( object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors) { return true ; }

 但这种方法对我无效,该出现的错误仍是继续出现.

最终解决办法是,在访问url前执行语句  ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3;便可

public ResponseModel GetHtml( string url) {       ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3; 　　　HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url); }