numtoch.cs

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

namespace NumToCHN
{
    public static class NumToCh
    {

        private static char ToNum(char x) //转换数字
        {
            string stringChnNames = "零壹贰叁肆伍陆柒捌玖";
            string stringNumNames = "0123456789";
            return stringChnNames[stringNumNames.IndexOf(x)];
        }

        public static string ToNumFive(string x) //转换万以下整数
        {
            string[] stringArrayLevelNames = new string[4] { "", "拾", "佰", "仟" };
            string ret = "";
            int i;
            for (i = x.Length - 1; i >= 0; i--)
                if (x[i] == '0')
                    ret = ToNum(x[i]) + ret;
                else
                    ret = ToNum(x[i]) + stringArrayLevelNames[x.Length - 1 - i] + ret;
            while ((i = ret.IndexOf("零零")) != -1)
                ret = ret.Remove(i, 1);
            if (ret[ret.Length - 1] == '零' && ret.Length > 1)
                ret = ret.Remove(ret.Length - 1, 1);
            if (ret.Length >= 2 && ret.Substring(0, 2) == "壹拾")
                ret = ret.Remove(0, 1);
            return ret;
        }
        public static string ToNumInt(string x)
        {
            int len = x.Length;
            string ret, temp;
            if (len <= 4)
                ret = ToNumFive(x);
            else if (len <= 8)
            {
                ret = ToNumFive(x.Substring(0, len - 4)) + "万";
                temp = ToNumFive(x.Substring(len - 4, 4));
                if (temp.IndexOf("仟") == -1 && temp != "")
                    ret += "零" + temp;
                else
                    ret += temp;
            }
            else
            {
                ret = ToNumFive(x.Substring(0, len - 8)) + "亿";
                temp = ToNumFive(x.Substring(len - 8, 4));
                if (temp.IndexOf("仟") == -1 && temp != "")
                    ret += "零" + temp;
                else
                    ret += temp;
                ret += "万";
                temp = ToNumFive(x.Substring(len - 4, 4));
                if (temp.IndexOf("仟") == -1 && temp != "")
                    ret += "零" + temp;
                else
                    ret += temp;
            }
            int i;
            if ((i = ret.IndexOf("零万")) != -1)
                ret = ret.Remove(i + 1, 1);
            while ((i = ret.IndexOf("零零")) != -1)
                ret = ret.Remove(i, 1);
            if (ret[ret.Length - 1] == '零' && ret.Length > 1)
                ret = ret.Remove(ret.Length - 1, 1);
            return ret;
        }

        public static string ToNumZero(string x)
        {
            string ret = "";
            for (int i = 0; i < x.Length; i++)
            {
                if (i == 0)
                    ret += ToNum(x[i]) + "角";
                else
                    if (i == 1)
                        ret += ToNum(x[i]) + "分";


            }
            return ret;
        }

        public static String NumToChn(string x)
        {
            if (x.Length == 0)
                return "";
            string ret = "";
            if (x[0] == '-')
            {
                ret = "负";
                x = x.Remove(0, 1);
            }
            if (x[0].ToString() == ".")
                x = "0" + x;
            if (x[x.Length - 1].ToString() == ".")
                x = x.Remove(x.Length - 1, 1);
            if (x.IndexOf(".") > -1)
                ret += ToNumInt(x.Substring(0, x.IndexOf("."))) + "圆" + ToNumZero(x.Substring(x.IndexOf(".") + 1));
            else
                ret += ToNumInt(x) + "圆整";
            return ret;
        }
    }
}