C# https请求使用SecurityProtocolType.Tls13

public static void SetCertificatePolicy()
        {
            System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;
            ServicePointManager.ServerCertificateValidationCallback += RemoteCertificateValidate;
        }

查阅资料好像说是Framework4.8有这个枚举，但是我安装不上。

如果确实需要这个安全类型的话，经过查阅资料发现我们可以使用带安全证书的形式进行访问。

HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
/*
req 的其他属性的赋值
*/
X509Certificate2 cer = new X509Certificate2("证书.p12文件路径", "证书密码", X509KeyStorageFlags.MachineKeySet | X509KeyStorageFlags.PersistKeySet | X509KeyStorageFlags.Exportable);
 
req.ClientCertificates.Add(cer);