常用Tools类

       ///   <summary> 将指定字符串按指定长度进行剪切 
        ///   
        ///   </summary> 
        ///   <param   name= "oldStr "> 需要截断的字符串 </param> 
        ///   <param   name= "maxLength "> 字符串的最大长度 </param> 
        ///   <param   name= "endWith "> 超过长度的后缀 </param> 
        ///   <returns> 如果超过长度，返回截断后的新字符串加上后缀，否则，返回原字符串 </returns> 
        public static string StringTruncat(string oldStr, int maxLength, string endWith)
        {
            if (string.IsNullOrEmpty(oldStr))
                //   throw   new   NullReferenceException( "原字符串不能为空 "); 
                return oldStr + endWith;
            if (maxLength < 1)
                throw new Exception("返回的字符串长度必须大于[0] ");
            if (oldStr.Length > maxLength)
            {
                string strTmp = oldStr.Substring(0, maxLength);
                if (string.IsNullOrEmpty(endWith))
                    return strTmp;
                else
                    return strTmp + endWith;
            }
            return oldStr;
        }

       /// <summary>后台执行JS代码alert
        /// 
        /// </summary>
        /// <param name="mes"></param>
        /// <param name="page"></param>
        public static void Show_MessageBox(string mes, Page page)
        {
            page.ClientScript.RegisterStartupScript(page.GetType(), "message", "<script>alert('" + mes + "');</script>");
        }

        /// <summary>后台执行JS代码alert,然后跳转
        /// 
        /// </summary>
        /// <param name="mes"></param>
        /// <param name="page"></param>
        public static void Show_MessageBox(string mes, string url, Page page)
        {
            page.ClientScript.RegisterStartupScript(page.GetType(), "message", "<script>alert('" + mes + "');location.href='" + url + "'</script>");
        }