防止https证书问题

IE里会提示否仍然继续的那种

public string RequestHttps(string url){
            ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(ValidationResult);
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            string encoding = response.ContentEncoding;
            if (encoding == null || encoding.Length < 1)
            {
                encoding = "UTF-8"; //默认编码
            }
            StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding(encoding));
            var content =  reader.ReadToEnd();
            response.Close();
            return content;
        }
        bool ValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
        {
            return true; //总是接受以防报证书错
        }