人民币转换的函数^_^

  /// <summary>
  /// 通过数字求金额的大写
  /// decimal p=123758.21m;
  /// Response.Write (new CommonFunction().ToUpper(p));
  /// </summary>
  /// <param name="d"></param>
  /// <returns></returns>
  public string ToUpper(decimal d)
  {
   if (d == 0)
    return "零元整";       
   string je = d.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";
   string 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 strMoney = "";
   switch ( c )
   {
    case '0':
     strMoney = "零";
     break;
    case '1':
     strMoney = "壹";
        break;
    case '2':
     strMoney = "贰";
     break;
    case '3':
     strMoney = "叁";
     break;
    case '4':
     strMoney = "肆";
     break;
    case '5':
     strMoney = "伍";
     break;
    case '6':
     strMoney = "陆";
     break;
    case '7':
     strMoney = "柒";
     break;
    case '8':
     strMoney = "捌";
     break;
    case '9':
     strMoney = "玖";
     break;
   }
   return strMoney;
  }