小函数集合

/// <summary>
        /// URL参数取参数值
        /// </summary>
        /// <param name="paramString">url</param>
        /// <param name="name">参数名</param>
        /// <returns></returns>
        public static string GetValueFromQueryString(string paramString, string name)
        {
            if (!string.IsNullOrEmpty(paramString))
            {
                //分组正则
                Regex reg = new Regex("(^|&|\\?)(?<name>[a-zA-Z]*)=(?<value>[^&]*)(&|$)");
                //匹配集合
                MatchCollection m = reg.Matches(paramString);

                foreach(Match match in m)
                {
                    if (match.Groups["name"].Value == name)
                    {
                        return match.Groups["value"].Value;
                    }
                }

            }

            return "";
        }