C#访问https “未能创建 SSL/TLS 安全通道”异常

C#使用HttpClient访问https请求被中止: 未能创建 SSL/TLS 安全通道(Could not create SSL/TLS secure channel)。
添加回调:
ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(CheckValidationCallback);
还不行, 添加: ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3;

private bool CheckValidationCallback(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors) 
{
            return true;
 }

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