C#简单爬虫核心代码

string strr = 网页url;
ServicePointManager.ServerCertificateValidationCallback += RemoteCertificateValidate;//验证服务器证书回调自动验证
System.Net.WebClient client = new System.Net.WebClient();
string reply = string.Empty;

reply = client.DownloadString(strr);

private static bool RemoteCertificateValidate(object sender, X509Certificate cert, X509Chain chain, SslPolicyErrors error)
{
        // trust any certificate!!!
        //为了通过证书验证，总是返回true
        return true;
}