人民币大小写转换C#版的详细介绍

using System;

namespace ExpertLib.ChineseSpecial
{
#region RMBException
/// <summary>
/// 人民币转换的错误
/// </summary>
public class RMBException : System.Exception
{
public RMBException(string msg)
: base(msg)
{
}
}
#endregion

/// <summary>
/// 实现将人民币的数字形式转换为中文格式，最大支持9兆兆。
/// </summary>
public static class RMB
{
#region 内部常量
private static string RMBUppercase = "零壹贰叁肆伍陆柒捌玖";
private static string RMBUnitChar = "元拾佰仟万拾佰仟亿拾佰仟兆拾佰仟万拾佰仟亿拾佰仟兆"; //人民币整数位对应的标志
private const decimal MaxNumber =9999999999999999999999999.99m;
private const decimal MinNumber = -9999999999999999999999999.99m;
private static char[] cDelim = { '.' }; //小数分隔标识
#endregion

#region Convert
#region Convert <decimal>
/// <summary>
/// 转换成人民币大写形式
/// </summary>
/// <param name="digital"></param>
/// <returns></returns>
public static string Convert(decimal number)
{
bool NegativeFlag=false;
decimal RMBNumber;

CheckNumberLimit(number);

RMBNumber = Math.Round(number, 2); //将四舍五入取2位小数
if (RMBNumber == 0)
{
return "零元整";
}
else if(RMBNumber < 0) //如果是负数
{
NegativeFlag = true;
RMBNumber = Math.Abs(RMBNumber); //取绝对值
}
else
{
NegativeFlag = false;
}

string buf = ""; // 存放返回结果
string strDecPart = ""; // 存放小数部分的处理结果
string strIntPart = ""; // 存放整数部分的处理结果
string[] tmp = null;
string strDigital = RMBNumber.ToString();

tmp = strDigital.Split(cDelim, 2); // 将数据分为整数和小数部分

if (RMBNumber >= 1m) // 大于1时才需要进行整数部分的转换
{
strIntPart = ConvertInt(tmp[0]);
}

if (tmp.Length > 1) //分解出了小数
{
strDecPart = ConvertDecimal(tmp[1]);
}
else //没有小数肯定是为整
{
strDecPart = "整";
}

if (NegativeFlag==false) //是否负数
{
buf = strIntPart + strDecPart;
}
else
{
buf = "负"+strIntPart + strDecPart;
}
return buf;
}
#endregion

#region Convert <double>
/// <summary>
/// 转换成人民币大写形式
/// </summary>
/// <param name="number"></param>
/// <returns></returns>
public static string Convert(double number)
{
decimal dec;
try
{
dec = System.Convert.ToDecimal(number);
}
catch
{
throw new RMBException("不能转成标准的decimal类型:" + number.ToString());
}
return Convert(dec);
}
#endregion

#region Convert <float>
/// <summary>
/// 转换成人民币大写形式
/// </summary>
/// <param name="number"></param>
/// <returns></returns>
public static string Convert(float number)
{
decimal dec;
try
{
dec = System.Convert.ToDecimal(number);
}
catch
{
throw new RMBException("不能转成标准的decimal类型:" + number.ToString());
}
return Convert(dec);
}
#endregion

#region Convert <int>
/// <summary>
/// 转换成人民币大写形式
/// </summary>
/// <param name="number"></param>
/// <returns></returns>
public static string Convert(int number)
{
decimal dec;
dec = System.Convert.ToDecimal(number);
return Convert(dec);
}
#endregion

#region Convert <long>
/// <summary>
/// 转换成人民币大写形式
/// </summary>
/// <param name="number"></param>
/// <returns></returns>
public static string Convert(long number)
{
decimal dec;
dec = System.Convert.ToDecimal(number);
return Convert(dec);
}
#endregion

#region Convert <string>
/// <summary>
/// 转换成人民币大写形式
/// </summary>
/// <param name="number"></param>
/// <returns></returns>
public static string Convert(string number)
{
decimal dec;
try
{
dec = System.Convert.ToDecimal(number,null);
}
catch
{
throw new RMBException("不能转成标准的decimal类型:" + number);
}
return Convert(dec);
}
#endregion
#endregion

#region MaxSupportNumber
/// <summary>
/// 支持的最大转换数
/// </summary>
public static decimal MaxSupportNumber
{
get
{
return MaxNumber;
}
}
#endregion

#region MinSupportNumber
/// <summary>
/// 支持的最小数
/// </summary>
public static decimal MinSupportNumber
{
get
{
return MinNumber;
}
}
#endregion

#region 内部函数
#region ConvertInt
private static string ConvertInt(string intPart)
{
string buf = "";
int length = intPart.Length;
int curUnit = length;

// 处理除个位以上的数据
string tmpValue = ""; // 记录当前数值的中文形式
string tmpUnit = ""; // 记录当前数值对应的中文单位
int i;
for (i = 0; i < length - 1; i++, curUnit--)
{
if (intPart[i] != '0')
{
tmpValue = DigToCC(intPart[i]);
tmpUnit = GetUnit(curUnit - 1);
}
else
{
// 如果当前的单位是"万、亿"，则需要把它记录下来
if ((curUnit - 1) % 4 == 0)
{
tmpValue = "";
tmpUnit = GetUnit(curUnit - 1);//

}
else
{
tmpUnit = "";

// 如果当前位是零，则需要判断它的下一位是否为零，再确定是否记录'零'
if (intPart[i + 1] != '0')
{

tmpValue = "零";

}
else
{
tmpValue = "";
}
}
}
buf += tmpValue + tmpUnit;
}

// 处理个位数据
if (intPart[i] != '0')
buf += DigToCC(intPart[i]);
buf += "元";

return CombinUnit(buf);
}
#endregion

#region ConvertDecimal
/// <summary>
/// 小数部分的处理
/// </summary>
/// <param name="decPart">需要处理的小数部分</param>
/// <returns></returns>
private static string ConvertDecimal(string decPart)
{
string buf = "";
int i = decPart.Length;

//如果小数点后均为零
if ((decPart == "0") || (decPart == "00"))
{
return "整";
}

if (decPart.Length > 1) //2位
{
if (decPart[0] == '0') //如果角位为零0.01
{
buf = DigToCC(decPart[1]) + "分"; //此时不可能分位为零
}
else if (decPart[1] == '0')
{
buf = DigToCC(decPart[0]) + "角整";
}
else
{
buf = DigToCC(decPart[0]) + "角";
buf += DigToCC(decPart[1]) + "分";
}
}
else //1位
{
buf += DigToCC(decPart[0]) + "角整";
}
return buf;
}
#endregion

#region GetUnit
/// <summary>
/// 获取人民币中文形式的对应位置的单位标志
/// </summary>
/// <param name="n"></param>
/// <returns></returns>
private static string GetUnit(int n)
{
return RMBUnitChar[n].ToString();
}
#endregion

#region DigToCC
/// <summary>
/// 数字转换为相应的中文字符 ( Digital To Chinese Char )
/// </summary>
/// <param name="c">以字符形式存储的数字</param>
/// <returns></returns>
private static string DigToCC(char c)
{
return RMBUppercase[c - '0'].ToString();
}
#endregion

#region CheckNumberLimit
private static void CheckNumberLimit(decimal number)
{
if ((number < MinNumber) || (number > MaxNumber))
{
throw new RMBException("超出可转换的范围");
}
}
#endregion

#region CombinUnit
/// <summary>
/// 合并兆亿万词
/// </summary>
/// <param name="rmb"></param>
/// <returns></returns>
private static string CombinUnit(string rmb)
{
if (rmb.Contains("兆亿万"))
{
return rmb.Replace("兆亿万", "兆");
}
if (rmb.Contains("亿万"))
{
return rmb.Replace("亿万", "亿");
}
if (rmb.Contains("兆亿"))
{
return rmb.Replace("兆亿", "兆");
}
return rmb;
}
#endregion
#endregion
}
}