摘要：
没有权限 设置权限WebClient client=new WebClient();//NetworkCredential credentials = new NetworkCredential("名字", "密码");//client.Credentials = credentials;未能为 SSL/TLS 安全通道建立信任的解决办法最简单的办法是:1,先加入命名空间：using System.Net.Security;using System.Security.Authentication;using System.Security.Cryptog 阅读全文
