C# 訪問https 未能建立 SSL/TLS 安全通道

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C# 訪問https請求被中止: 未能建立 SSL/TLS 安全通道(Could not create SSL/TLS secure channel)

一般GetResponse可以直接存取https,如果不行添加回調:

ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(CheckValidationResult);
還不行, 添加:ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3;

           public string GetHttpWebResponse(string url, string postData, string code = "utf-8")        {            ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3;            ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(CheckValidationResult);            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);            HttpWebResponse response = null;            try            {                response = (HttpWebResponse)request.GetResponse();                using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding(code)))                {                    return reader.ReadToEnd();                }            }            catch (WebException e)            {                return e.Message;            }            finally            {                if (response != null) response.Close();            }        }        public static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)        {            return true;        }

　　

C# 訪問https 未能建立 SSL/TLS 安全通道