c#实现人民币大小写转换的代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;


namespace Utility
{
    /// <summary>
    ///金钱转换成大写    DBA群： 225982985
    /// </summary>
    public class ConvertMoney
    {
        public ConvertMoney()
        {
            //
            //TODO: 在此处添加构造函数逻辑
            //
        }
        /// <summary>
        /// 把数字转换成对应的大写钱数
        /// </summary>
        /// <param name="strDigital">要转换的数字</param>
        /// <returns>转换结果</returns>
        public string ConvertSumToCap(string strDigital)
        {
            decimal dshuzi;
            string ret = "";
            dshuzi = decimal.Parse(strDigital);


            if (dshuzi == 0)
            {
                ret = "零元整";
                return ret;
            }


            string je = dshuzi.ToString("####.00");
            if (je.Length > 15)
                return "";
            je = new String('0', 15 - je.Length) + je;//若小于15位长，前面补0


            string stry = je.Substring(0, 4);//取得'亿'单元
            string strw = je.Substring(4, 4);//取得'万'单元
            string strg = je.Substring(8, 4);//取得'元'单元
            string strf = je.Substring(13, 2);//取得小数部分


            string str1 = "", str2 = "", str3 = "";


            str1 = this.getupper(stry, "亿");//亿单元的大写
            str2 = this.getupper(strw, "万");//万单元的大写
            str3 = this.getupper(strg, "元");//元单元的大写


            string str_y = "", str_w = "";
            if (je[3] == '0' || je[4] == '0')//亿和万之间是否有0
                str_y = "零";
            if (je[7] == '0' || je[8] == '0')//万和元之间是否有0
                str_w = "零";


            ret = str1 + str_y + str2 + str_w + str3;//亿，万，元的三个大写合并


            for (int i = 0; i < ret.Length; i++)//去掉前面的"零"
            {
                if (ret[i] != '零')
                {
                    ret = ret.Substring(i);
                    break;
                }


            }
            for (int i = ret.Length - 1; i > -1; i--)//去掉最后的"零"
            {
                if (ret[i] != '零')
                {
                    ret = ret.Substring(0, i + 1);
                    break;
                }
            }


            if (ret[ret.Length - 1] != '元')//若最后不位不是'元'，则加一个'元'字
                ret = ret + "元";


            if (ret == "零零元")//若为零元，则去掉"元数"，结果只要小数部分
                ret = "";


            if (strf == "00")//下面是小数部分的转换
            {
                ret = ret + "整";
            }
            else
            {
                string tmp = "";
                tmp = this.getint(strf[0]);
                if (tmp == "零")
                    ret = ret + tmp;
                else
                    ret = ret + tmp + "角";


                tmp = this.getint(strf[1]);
                if (tmp == "零")
                    ret = ret + "整";
                else
                    ret = ret + tmp + "分";
            }


            if (ret[0] == '零')
            {
                ret = ret.Substring(1);//防止0.03转为"零叁分"，而直接转为"叁分"
            }


            return ret;//完成，返回
        }


        /// <summary>
        /// 把一个单元转为大写，如亿单元，万单元，个单元
        /// </summary>
        /// <param name="str">这个单元的小写数字（4位长，若不足，则前面补零）</param>
        /// <param name="strDW">亿，万，元</param>
        /// <returns>转换结果</returns>
        private string getupper(string str, string strDW)
        {
            if (str == "0000")
                return "";


            string ret = "";
            string tmp1 = this.getint(str[0]);
            string tmp2 = this.getint(str[1]);
            string tmp3 = this.getint(str[2]);
            string tmp4 = this.getint(str[3]);
            if (tmp1 != "零")
            {
                ret = ret + tmp1 + "仟";
            }
            else
            {
                ret = ret + tmp1;
            }


            if (tmp2 != "零")
            {
                ret = ret + tmp2 + "佰";
            }
            else
            {
                if (tmp1 != "零")//保证若有两个零'00'，结果只有一个零，下同
                    ret = ret + tmp2;
            }


            if (tmp3 != "零")
            {
                ret = ret + tmp3 + "拾";
            }
            else
            {
                if (tmp2 != "零")
                    ret = ret + tmp3;
            }


            if (tmp4 != "零")
            {
                ret = ret + tmp4;
            }


            if (ret[0] == '零')//若第一个字符是'零'，则去掉
                ret = ret.Substring(1);
            if (ret[ret.Length - 1] == '零')//若最后一个字符是'零'，则去掉
                ret = ret.Substring(0, ret.Length - 1);


            return ret + strDW;//加上本单元的单位


        }
        /// <summary>
        /// 单个数字转为大写
        /// </summary>
        /// <param name="c">小写阿拉伯数字 0---9</param>
        /// <returns>大写数字</returns>
        private string getint(char c)
        {
            string str = "";
            switch (c)
            {
                case '0':
                    str = "零";
                    break;
                case '1':
                    str = "壹";
                    break;
                case '2':
                    str = "贰";
                    break;
                case '3':
                    str = "叁";
                    break;
                case '4':
                    str = "肆";
                    break;
                case '5':
                    str = "伍";
                    break;
                case '6':
                    str = "陆";
                    break;
                case '7':
                    str = "柒";
                    break;
                case '8':
                    str = "拐";
                    break;
                case '9':
                    str = "玖";
                    break;
            }
            return str;
        }


    }
}