C#中金额的大小写转换

        public static string MoneyToUpper(string strAmount)
        {
            string functionReturnValue =null;
            bool IsNegative =false; // 是否是负数
            if (strAmount.Trim().Substring(0, 1) =="-")
            {
                // 是负数则先转为正数
                strAmount = strAmount.Trim().Remove(0, 1);
                IsNegative =true;
            }
            string strLower =null;
            string strUpart =null;
            string strUpper =null;
            int iTemp =0;
            // 保留两位小数 123.489→123.49　　123.4→123.4
            strAmount = Math.Round(double.Parse(strAmount), 2).ToString();
            if (strAmount.IndexOf(".") >0)
            {
                if (strAmount.IndexOf(".") == strAmount.Length -2)
                {
                    strAmount = strAmount +"0";
                }
            }
            else
            {
                strAmount = strAmount +".00";
            }
            strLower = strAmount;
            iTemp =1;
            strUpper ="";
            while (iTemp <= strLower.Length)
            {
                switch (strLower.Substring(strLower.Length - iTemp, 1))
                {
                    case".":
                        strUpart ="圆";
                        break;
                    case"0":
                        strUpart ="零";
                        break;
                    case"1":
                        strUpart ="壹";
                        break;
                    case"2":
                        strUpart ="贰";
                        break;
                    case"3":
                        strUpart ="叁";
                        break;
                    case"4":
                        strUpart ="肆";
                        break;
                    case"5":
                        strUpart ="伍";
                        break;
                    case"6":
                        strUpart ="陆";
                        break;
                    case"7":
                        strUpart ="柒";
                        break;
                    case"8":
                        strUpart ="捌";
                        break;
                    case"9":
                        strUpart ="玖";
                        break;
                }

                switch (iTemp)
                {
                    case1:
                        strUpart = strUpart +"分";
                        break;
                    case2:
                        strUpart = strUpart +"角";
                        break;
                    case3:
                        strUpart = strUpart +"";
                        break;
                    case4:
                        strUpart = strUpart +"";
                        break;
                    case5:
                        strUpart = strUpart +"拾";
                        break;
                    case6:
                        strUpart = strUpart +"佰";
                        break;
                    case7:
                        strUpart = strUpart +"仟";
                        break;
                    case8:
                        strUpart = strUpart +"万";
                        break;
                    case9:
                        strUpart = strUpart +"拾";
                        break;
                    case10:
                        strUpart = strUpart +"佰";
                        break;
                    case11:
                        strUpart = strUpart +"仟";
                        break;
                    case12:
                        strUpart = strUpart +"亿";
                        break;
                    case13:
                        strUpart = strUpart +"拾";
                        break;
                    case14:
                        strUpart = strUpart +"佰";
                        break;
                    case15:
                        strUpart = strUpart +"仟";
                        break;
                    case16:
                        strUpart = strUpart +"万";
                        break;
                    default:
                        strUpart = strUpart +"";
                        break;
                }

                strUpper = strUpart + strUpper;
                iTemp = iTemp +1;
            }

            strUpper = strUpper.Replace("零拾", "零");
            strUpper = strUpper.Replace("零佰", "零");
            strUpper = strUpper.Replace("零仟", "零");
            strUpper = strUpper.Replace("零零零", "零");
            strUpper = strUpper.Replace("零零", "零");
            strUpper = strUpper.Replace("零角零分", "整");
            strUpper = strUpper.Replace("零分", "整");
            strUpper = strUpper.Replace("零角", "零");
            strUpper = strUpper.Replace("零亿零万零圆", "亿圆");
            strUpper = strUpper.Replace("亿零万零圆", "亿圆");
            strUpper = strUpper.Replace("零亿零万", "亿");
            strUpper = strUpper.Replace("零万零圆", "万圆");
            strUpper = strUpper.Replace("零亿", "亿");
            strUpper = strUpper.Replace("零万", "万");
            strUpper = strUpper.Replace("零圆", "圆");
            strUpper = strUpper.Replace("零零", "零");

            // 对壹圆以下的金额的处理
            if (strUpper.Substring(0, 1) =="圆")
            {
                strUpper = strUpper.Substring(1, strUpper.Length -1);
            }
            if (strUpper.Substring(0, 1) =="零")
            {
                strUpper = strUpper.Substring(1, strUpper.Length -1);
            }
            if (strUpper.Substring(0, 1) =="角")
            {
                strUpper = strUpper.Substring(1, strUpper.Length -1);
            }
            if (strUpper.Substring(0, 1) =="分")
            {
                strUpper = strUpper.Substring(1, strUpper.Length -1);
            }
            if (strUpper.Substring(0, 1) =="整")
            {
                strUpper ="零圆整";
            }
            functionReturnValue = strUpper;

            if (IsNegative ==true)
            {
                return"负"+ functionReturnValue;
            }
            else
            {
                return functionReturnValue;
            }
        }