/// <summary>
/// 小写金额转换为大写金额
/// </summary>
/// <param name="figures">小写金额</param>
/// <returns>大写金额</returns>
public string Figures2Words(decimal figures)
{
    StringBuilder words = new StringBuilder();
    string cnNumber = "零壹贰叁肆伍陆柒捌玖";//大写
    string cnUnit = "分角圆拾佰仟万拾佰仟亿拾佰仟兆拾佰仟";//单位
    string temp = Math.Round(figures + (decimal)0.001, 2).ToString().Replace(".", string.Empty);//精确到 2 位小数，并去掉 . 号
    try
    {
        int length = temp.Length - 1;
        if (length > 0 && length < 18)//处理仟兆以内
        {
            int j = 0;
            int n = 0;
            for (int i = 0; i <= length; i++)
            {
                j = (int)temp[i] - 48;// 当前位转换为索引。0 在 ASCII中对应48，1 为 49，依次类推
                n = i + 1 >= length ? (int)temp[length] - 48 : (int)temp[i + 1] - 48;//高一位转换为索引
                if (j == 0)//当前位数字为 0
                {
                    if (length - i == 2 || length - i == 6 || length - i == 10 || length - i == 14)//对应圆、万、亿、兆，(length - i - 2) % 4 == 0
                    {
                        words.Append(cnUnit[length - i]);
                    }
                    else
                    {
                        if (n != 0)
                        {
                            words.Append(cnNumber[j]);
                        }
                    }
                }
                else//当前位数字不为 0
                {
                    words.Append(cnNumber[j]);//数字转换为大写
                    words.Append(cnUnit[length - i]);//其后加上货币单位
                }
            }
            //words.Append("整");
        }
        else
        {
            words.Append("溢出");
        }
    }
    catch
    {
        return string.Empty;
    }
    return words.ToString();
}