自訂的asp.net截取字串代碼

自訂的asp教程.net截取字串代碼

/// 截取字串並限制字串長度，多於給定的長度＋。。。
    /// </summary>
    /// <param name="str">待截取的字串</param>
    /// <param name="len">每行的長度，多於這個長度自動換行</param>
    /// <param name="max">輸出字串最大的長度</param>
    /// <returns></returns>
    public string CutStr(string str, int len, int max)
    {
        string s = "";
        string sheng = "";
        if (str.Length > max)
        {
            str = str.Substring(0, max);
            sheng = "";
        }
        for (int i = 0; i < str.Length; i++)
        {
            int r = i % len;
            int last = (str.Length / len) * len;
            if (i != 0 && i <= last)
            {

                if (r == 0)
                {
                    s += str.Substring(i - len, len) + "<br>";
                }

            }
            else if (i > last)
            {
                s += str.Substring(i - 1);
                break;
            }

        }

        return s + sheng;

    }