精确截取字符串(全角半角处理)

后台

    /// <summary>
    /// 截取字符串（按全角长度，一个全角等于两个半角）
    /// </summary>
    /// <param name="str">字符串</param>
    /// <param name="length">截取长度（全角）</param>
    /// <param name="length1">此处填0</param>
    /// <returns></returns>
    public String InterceptString(String str, Int32 length, Int32 length1)
    {
        str = ClearBlank(str);
        //System.Text.RegularExpressions.Regex.Replace(str, "");
        if (str.Length > length)
        {
            if (length1 == 0)
            {
                length1 = length;
            }
            if (str.Length >= length1)
            {
                String str_left = str.Substring(0, length1);
                String str_right = str.Remove(0, length1);
                int banjiao = 0, other = 0;
                char[] chars = str_left.Trim().ToCharArray();
                foreach (char ch in chars)
                {
                    if (ch >= 33 && ch <= 126)
                    {
                        banjiao++;