C#把数字转换成大写金额的代码实例

实现代码：

// 例如：(new money(200)).tostring() == "贰佰元"
namespace skyiv.util {
    using system.text;
    class test {
        static void main() {
            for (;;) {
                system.console.write("金额: ");
                string s = system.console.readline();
                decimal m;
                try {
                    m = decimal.parse(s);
                } catch {
                    break;
                }
                system.console.writeline("大写: " + new money(m));
            }
        }
    }
    // 该类重载的 tostring() 方法返回的是大写金额字符串
    class money {
        public string yuan = "元"; // “元”，可以改为“圆”、“卢布”之类
        public string jiao = "角"; // “角”，可以改为“拾”
        public string fen = "分"; // “分”，可以改为“美分”之类
        static string digit = "零壹贰叁肆伍陆柒捌玖"; // 大写数字
        bool isallzero = true; // 片段内是否全零
        bool isprezero = true; // 低一位数字是否是零
        bool overflow = false; // 溢出标志
        long money100; // 金额*100，即以“分”为单位的金额
        long value; // money100的绝对值
        stringbuilder sb = new stringbuilder(); // 大写金额字符串，逆序
        // 只读属性: "零元"
        public string zerostring {
            get {
                return digit[0] + yuan;
            }
        }
        // 构造函数
        public money(decimal money) {
            try {
                money100 = (long)(money * 100m);
            } catch {
                overflow = true;
            }
            if (money100 == long.minvalue) overflow = true;
        }
        // 重载 tostring() 方法，返回大写金额字符串
        public override string tostring() {
            if (overflow) return "金额超出范围";
            if (money100 == 0) return zerostring;
            string[] unit = {
                yuan,
                "万",
                "亿",
                "万",
                "亿亿"
            };
            value = system.math.abs(money100);
            parsesection(true);
            for (int i = 0; i < unit.length && value > 0; i++) {
                if (isprezero && !isallzero) sb.append(digit[0]);
                if (i == 4 && sb.tostring().endswith(unit[2])) sb.remove(sb.length - unit[2].length, unit[2].length);
                sb.append(unit[i]);
                parsesection(false);
                if ((i % 2) == 1 && isallzero) sb.remove(sb.length - unit[i].length, unit[i].length);
            }
            if (money100 < 0) sb.append("负");
            return reverse();
        }
        // 解析“片段”: “角分(2位)”或“万以内的一段(4位)”
        void parsesection(bool isjiaofen) {
            string[] unit = isjiaofen ? new string[] {
                fen,
                jiao
            }: new string[] {
                "",
                "拾",
                "佰",
                "仟"
            };
            isallzero = true;
            for (int i = 0; i < unit.length && value > 0; i++) {
                int d = (int)(value % 10);
                if (d != 0) {
                    if (isprezero && !isallzero) sb.append(digit[0]);
                    sb.appendformat("{0}{1}", unit[i], digit[d]);
                    isallzero = false;
                }
                isprezero = (d == 0);
                value /= 10;
            }
        }
        // 反转字符串
        string reverse() {
            stringbuilder sbreversed = new stringbuilder();
            for (int i = sb.length - 1; i >= 0; i--) sbreversed.append(sb[i]);
            return sbreversed.tostring();
        }
    }
}