HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url);
req.Method = "GET";
HttpWebResponse sp = (HttpWebResponse)req.GetResponse();
作处理时，有些输入有些URL会在HttpWebResponse sp = (HttpWebResponse)req.GetResponse();的时候抛出一个“基础连接已经关闭: 未能为 SSL/TLS 安全通道建立信任关系”的异常。
最简单的办法是:
1,先加入命名空间：
using System.Security.Authentication;
using System.Security.Cryptography.X509Certificates;
using System.Net.Security;
2，再重载CheckValidationResult方法，返回true
public bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
{ // 总是接受
return true;
}
3,然后在HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url);前面加上如下一行代码：
ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(CheckValidationResult);//验证服务器证书回调自动验证
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