C#模拟Http与Https请求框架类实例

            Regex re = new Regex(pattern, RegexOptions.IgnoreCase);
            MatchCollection matchs = re.Matches(html);
            if (matchs.Count > 0)
            {
                return matchs[0].Groups[1].Value;
            }
            else
                return "";
        }

        /// <summary>
        /// 正则验证返回的response是否正确
        /// </summary>
        /// <param name="html"></param>
        /// <param name="pattern"></param>
        /// <returns></returns>
        public bool verifyResponseHtml(string html ,string pattern)
        {
            Regex re = new Regex(pattern);
            return re.IsMatch(html);
        }

        //注册证书验证回调事件，在请求之前注册
        private void SetCertificatePolicy()
        {
            ServicePointManager.ServerCertificateValidationCallback
                       += RemoteCertificateValidate;
        }
        /// <summary>  
        /// 远程证书验证，固定返回true 
        /// </summary>  
        private static bool RemoteCertificateValidate(object sender, X509Certificate cert,
            X509Chain chain, SslPolicyErrors error)