C# 字符串操作类库：人民币符号、字符串截取、颜色转换

///

/// 获取人民币符号 ///

public static string RMB { get { return '￥'; } }

    #region 将指定字符串按指定长度进行剪切
    /// <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;
    }

    #endregion

    #region 将字符串转换为Color
    /// <summary>
    /// 将字符串转换为Color
    /// </summary>
    /// <param name="color"></param>
    /// <returns></returns>
    public static Color ToColor(string color)
    {
        int red, green, blue = 0;
        char[] rgb;
        color = color.TrimStart('#');
        color = Regex.Replace(color.ToLower(), "[g-zG-Z]", "");
        switch (color.Length)
        {
            case 3:
                rgb = color.ToCharArray();
                red = Convert.ToInt32(rgb[0].ToString() + rgb[0].ToString(), 16);
                green = Convert.ToInt32(rgb[1].ToString() + rgb[1].ToString(), 16);
                blue = Convert.ToInt32(rgb[2].ToString() + rgb[2].ToString(), 16);
                return Color.FromArgb(red, green, blue);
            case 6:
                rgb = color.ToCharArray();
                red = Convert.ToInt32(rgb[0].ToString() + rgb[1].ToString(), 16);
                green = Convert.ToInt32(rgb[2].ToString() + rgb[3].ToString(), 16);
                blue = Convert.ToInt32(rgb[4].ToString() + rgb[5].ToString(), 16);
                return Color.FromArgb(red, green, blue);
            default:
                return Color.FromName(color);

        }
    }

    #endregion
}

}