.NET截取指定长度字符超出部分以"..."代替

    ///   <summary>   
    ///   将指定字符串按指定长度进行剪切，   
    ///   </summary>   
    ///   <param   name= "Str "> 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 Str, int maxLength, string endWith)
    {
        if (string.IsNullOrEmpty(Str))
        {
            return string.Empty;
        }
        if (maxLength < 1)
        {
            return Str;
        }
        if (Str.Length > maxLength)
        {
            string strTmp = Str.Substring(0, maxLength);
            if (string.IsNullOrEmpty(endWith))
                return strTmp;
            else
                return strTmp + endWith;
        }
        return Str;
    }