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) System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3;
此方法 适用于FrameWoke 4 和 Framewoke4.5