在很多企业级的软件开发中，很多时候会涉及到人民币的小写转大写。原来有个VB6的程序，现转为.Net，实现相当简单，同时支持达千百万亿的金额转换。现贴出代码以供参考：（本思路有别于网上很多的代码，通读易懂，可说是最佳实现）
/// <summary>
/// 小写金额转换成大写金额
/// </summary>
/// <param name="number"></param>
/// <param name="turnType"></param>
/// <returns></returns>
public static string ConvertToCHNMoney(decimal number, CHNMoneyType turnType)
{
string s_CHNNumString = "零壹贰叁肆伍陆柒捌玖";
//可正确最大金额可以到千万亿元正，有分位为百万亿元或十万亿
string result = string.Empty;
if (number > 0)
{
string s_DXDw = "分角元拾佰仟万拾佰仟亿拾佰仟万拾佰仟";
ulong je = (ulong)(number * 100);
ulong temNum = je;
int index = 0;
for (int n = 0; temNum != 0; n++)
{
index = (int)(temNum - temNum / 10 * 10); //取出最后一个数
temNum = temNum / 10;
result = s_CHNNumString.Substring(index, 1) + s_DXDw.Substring(n, 1) + result; //发票格式
}
if (turnType == CHNMoneyType.CheckType)
{
string temResult = string.Empty;
string temMoney = string.Empty;
string unit = string.Empty;
string digitChar = string.Empty;
string str1 = "零元万整";
string str2 = "零元万亿整";
for (int n = result.Length - 2; n >= 0; n = n - 2) //从后面每二个取字符串。
{
temMoney = result.Substring(n, 2);
unit = temMoney.Substring(1, 1);
digitChar = temMoney.Substring(0, 1);
switch (unit)
{
case "分":
if (digitChar == "零")
temMoney = "整";
break;
case "元":
case "万":
case "亿":
string temDigitChar = temResult.Substring(0, 1);
if (digitChar == "零")
{
if (str1.IndexOf(temDigitChar) == -1)
temMoney = unit + "零";
else
{
if (temDigitChar == "万")
temResult = temResult.Substring(1);
temMoney = unit;
}
}
else if (temDigitChar == "万")
temResult = temResult.Substring(1);
break;
default:
if (digitChar == "零")
{
if (str2.IndexOf(temResult.Substring(0, 1)) != -1)
temMoney = "";
else
temMoney = "零";
}
break;
}
temResult = temMoney + temResult;
}
result = temResult;
}
}
return result;
}
}
/// <summary>
/// 大字金额的格式。
/// </summary>
public enum CHNMoneyType
{
/// <summary>
/// 支票格式
/// </summary>
CheckType,
/// <summary>
/// 发票格式
/// </summary>
InvoiceType
}