费了九牛二虎之力才搞定的大写数字转换的代码.

最简单的事情最麻烦, 希望已经没有BUG了.

using System;
using System.Collections;
using System.IO;
using System.Text;

namespace HXBTools.Util
{
    /**//// <summary>
    /// 用于将一个数值型转化为汉语的读法.
    /// </summary>
    public class NumberToChn
    {
        public NumberToChn()
        {
            //
            // TODO: 在此处添加构造函数逻辑
            //
        }

        public static string GetChn(decimal dc, bool bUpper)
        {
            return GetChn(dc.ToString(), bUpper);
        }

        public static string GetChn(int i, bool bUpper)
        {
            return GetChn(i.ToString(), bUpper);
        }

        public static string GetChn(long l, bool bUpper)
        {
            return GetChn(l.ToString(), bUpper);
        }        

        public static string GetRMBChn(string sDigital, bool bUpper)
        {
            // 找出第一个点所在的位置，之前的部分用getchn来处理，之后的部分自已处理．
            if (sDigital == null | sDigital.Length == 0)
                return "";

            int iIndex = sDigital.IndexOf(".");
            string sIntPart;
            string sDecPart;
            if (iIndex == -1)
            {
                sIntPart = sDigital;
                sDecPart = "";
            }
            else
            {
                sIntPart = sDigital.Substring(0, iIndex);
                sDecPart = sDigital.Substring(iIndex+1);
            }

            StringBuilder sb = new StringBuilder(sDigital.Length * 2 + 10);
            foreach(char c in sDecPart)
            {
                if ( char.IsDigit(c))
                {
                    sb.Append(c);
                }
            }
            sDecPart = sb.ToString();
            sb.Length = 0;

            string sTmp = GetChn(sIntPart, bUpper);
            if (sTmp != "零" && sTmp.Length != 0)
            {
                sb.Append(sTmp);
                sb.Append(bUpper?'园':'元');            
            }
            
            bool bPrevIsZero = false;
            if (sIntPart.Length > 0 && sIntPart.EndsWith("0") && sb.Length > 1)
            {
                bPrevIsZero = true;
            }
            for (int i = 0; i < sDecPart.Length && i < arRMBRight.Length; i ++)
            {
                if (sDecPart[i] == '0')
                {
                    bPrevIsZero = true;
                }
                else
                {
                    if (bPrevIsZero == true)
                    {
                        sb.Append('零');
                        bPrevIsZero = false;
                    }
                    sb.Append(bUpper?arDigitals2[sDecPart[i] - '0']:arDigitals[sDecPart[i] - '0']);
                    sb.Append(arRMBRight[i]);
                }
            }
            if (sb.Length > 0)
            {
                sb.Append('整');
            }
            else
            {
                sb.Append(bUpper?"零园整":"零元整");
            }
            return sb.ToString();
        }

        public static string GetChn(string s, bool bUpper)
        {
            // 先将s过滤，删除所有的非数字字符。
            if (s == null || s.Trim().Length == 0)
                return "";
            StringBuilder sb = new StringBuilder(s.Length);
            int iPointCount = 0;
            for(int i = 0; i < s.Length; i ++)
            {
                char c = s[i];
                if (Char.IsDigit(c))
                {
                    sb.Append(c);
                }
                else if (c == '.')
                {
                    // 如果是第二个之后的点，那么不管了。
                    if (iPointCount == 0)
                    {
                        sb.Append(c);
                        iPointCount ++;
                    }                                        
                }
                else if( c == '-' && i == 0) 
                {
                    sb.Append(c);
                }
                else
                {
                    // 省下的全部忽略
                }
            }

            string sDigital = sb.ToString();
            if (sDigital.EndsWith("."))
            {
                sDigital = sDigital.Substring(0,sDigital.Length - 1);
            }
            if (sDigital.Length == 0)
            {
                sDigital = "0";
            }
            
            sb.Length = 0; // 留为后用。
            
            // 从小数点前后分为两部分
            int iTmp = sDigital.IndexOf('.');
            string sIntPart;
            string sDecimalPart;
            if (iTmp == -1)
            {
                sIntPart = sDigital;
                sDecimalPart = "";
            }
            else
            {
                sIntPart = sDigital.Substring(0, iTmp);
                sDecimalPart = sDigital.Substring(iTmp+1);
            }

            // 处理小数点之前的部分

            // 先决定最高位是什么位，再依次地向后拼出。
            // 大循环是亿的个数， 小循环是万的个数。
            
            sb = new StringBuilder(sDigital.Length * 2 + 6);
            if (sDigital.StartsWith("-"))
            {
                sb.Append("负");
                sIntPart = sIntPart.Substring(1);
            }
            // 如果小数点之后没有内容，之前部分又是空，那么不输出．
            if (sIntPart.Length == 0 && sDecimalPart.Length == 0)
            {
                return "";
            }

            int iBitCntInWan = 0;
            bool bPrevIs0 = false;
            int iWanNotZeroCnt = 0;
            int iNotZeroCnt = 0;

            for (int i = 0; i < sIntPart.Length; i ++)
            {
                int iBitCnt = sIntPart.Length - i -1;

                char cNum = sIntPart[i];
                if (cNum == '0')
                {
                    // 如果是零，那么不处理
                    bPrevIs0 = true;
                }
                else
                {
                    if (bPrevIs0)
                    {
                        // 如果上一个是０
                        if(iNotZeroCnt > 0)
                        {
                            //如果不是第一个字 那么加一个零字                                    
                            sb.Append(bUpper?arDigitals2[0]:arDigitals[0]);
                        }                                
                    }
                    iWanNotZeroCnt ++;
                    iNotZeroCnt ++;

                    bPrevIs0 = false;
                    sb.Append(bUpper?arDigitals2[cNum - '0']:arDigitals[cNum - '0']);    // 加数名
                    iBitCntInWan = iBitCnt % 4;
                    if (iBitCntInWan != 0)
                    {
                        sb.Append(bUpper?arRights2[iBitCntInWan]:arRights[iBitCntInWan]);    // 加权名
                    }
                }

                if (iBitCnt % 8 == 0)
                {
                    // 遇亿的处理
                    if (iBitCnt / 8 >= 1 && iNotZeroCnt > 0 )
                        sb.Append('亿');
                    bPrevIs0 = false;
                    iWanNotZeroCnt = 0;
                }
                else if (iBitCnt % 4 == 0)
                {
                    // 遇万位的处理
                    if ((iBitCnt % 8)/4 >= 1 && iWanNotZeroCnt > 0 )
                    {
                        sb.Append('万');
                    }
                    bPrevIs0 = false;
                    iWanNotZeroCnt = 0;
                }
            }


            // 如果全部都是０，那么输出一个＂零＂．
            if (iNotZeroCnt == 0)
            {
                sb.Append("零");
            }            

            // 处理小数点之后的部分
            if(sDecimalPart.Length != 0)
            {
                sb.Append("点");
                for(int i = 0;  i < sDecimalPart.Length; i ++)
                {
                    sb.Append(bUpper?arDigitals2[sDecimalPart[i]-'0']:arDigitals[sDecimalPart[i]-'0']);
                }
            }
            iTmp = 0;
            if (sb[0] == '负')
            {
                iTmp =1;
            }

            // 把起头的＂一十＂改为＂拾＂．
            if (sb.Length >= 2)
            {
                if (sb[iTmp] == (bUpper?arDigitals2[1]:arDigitals[1]) && 
                    sb[iTmp + 1] == (bUpper?arRights2[1]:arRights[1]))
                {
                    sb.Remove(iTmp,1);
                }
            }
            return sb.ToString();
        }

        private static char [] arRights = {' ', '十', '百', '千'}; // 权名
        private static char [] arRights2 = {' ', '拾', '佰', '仟'}; // 权名

        private static char [] arDigitals = {
                                              '零','一','二','三','四','五','六','七','八','九'
                                              };
        private static char [] arDigitals2= {
                                                '零','壹','贰','叁','肆','伍','陆','柒','捌','玖'
                                            };

        private static char [] arRMBRight = {'角', '分', '厘', '毫', '丝'};

    }
}