支持库：String扩展

    public static class StringExtensions
    {
        /// <summary>
        /// 转换为Int32
        /// </summary>
        /// <param name="num"></param>
        /// <returns></returns>
        public static int ToInt32(this string num)
        {
            int i;
            return (!Int32.TryParse(num, out i)) ? i : 0;
        }
        /// <summary>
        /// 转换为双精度
        /// </summary>
        /// <param name="num"></param>
        /// <returns></returns>
        public static double ToDouble(this string num)
        {
            double i;
            return (Double.TryParse(num, out i)) ? i : 0.0;
        }
        /// <summary>
        /// 获取MD5值
        /// </summary>
        /// <param name="str">加密的字符串</param>
        /// <returns>返回MD5值</returns>
        public static string ToMd5(this string str)
        {
            return FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5");
        }

        /// <summary>
        /// 将source转换为以sp分隔的数组
        /// </summary>
        /// <param name="source"></param>
        /// <param name="sp"></param>
        /// <returns></returns>
        public static string[] SplitString(this string source, string sp)
        {
            return Regex.Split(source, sp, RegexOptions.IgnoreCase);
        }

        private static readonly DateTime nullDate = new DateTime(1900, 1, 1, 12, 0, 0);
        /// <summary>
        /// 字符串转为日期
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static DateTime ToDate(this string str)
        {
            return IsDate(str) ? DateTime.Parse(str) : nullDate;
        }
        /// <summary>
        /// 判断一个字符串是否是日期格式
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static bool IsDate(this string str)
        {
            if (String.IsNullOrEmpty(str)) return false;
            var r = new Regex(@"\d{4}([/-年])\d{1,2}([/-月])\d{1,2}([日])\s?\d{0,2}:?\d{0,2}:?\d{0,2}");
            if(r.IsMatch(str))
            {
                str = str.Replace("年", "-");
                str = str.Replace("月", "-");
                str = str.Replace("日", " ");
                str = str.Replace("  ", " ");

                DateTime dt;
                return DateTime.TryParse(str,out dt);
            }
            return false;
        }
        /// <summary>
        /// 转换为农历日期
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string GetChineseDate(this string str)
        {
            var dt = ToDate(str);
            return ToDate(str).DateDiff(nullDate, "day") != 0 ? dt.GetChineseDate() : "";
        }
        /// <summary>
        /// 实现JS.Escape
        /// </summary>
        /// <param name="s"></param>
        /// <returns></returns>
        public static string Escape(this string s)
        {
            return String.IsNullOrEmpty(s) ? "" : Uri.EscapeUriString(s);
        }

        /// <summary>
        /// 实现JS.Escape
        /// </summary>
        /// <param name="s"></param>
        /// <returns></returns>
        public static string Unescape(this string s)
        {
            return String.IsNullOrEmpty(s) ? "" : Uri.UnescapeDataString(s);
        }
    }