/// <summary>
        /// 替换换行符
        /// </summary>
        /// <param name="?"></param>
        /// <returns></returns>
        public static string Replace_Enter(string str)
        {
            string temp = string.Empty;
            if (str.Contains("\n"))
            {
                temp = str.Replace("\n", "<br />");
                return temp;
            }
            if (str.Contains("\r"))
            {
                temp = str.Replace("\r", "<br />");
                return temp;
            }
            return str;
        }