C# 数值转换中文大写

发票支票都要用到数值转换为中文大写，这里提供一个代码解决方案，此方法到兆为止，之前那个如果到亿以后当中很多个零的话就错了（亿以前是对的），现在改了，不过在纠结到底是“陆亿伍仟零叁拾贰圆整”还是“陆亿伍仟万零叁拾贰圆整”现在是前一钟

public readonly string[] RMBUNIT = { "圆", "角", "分", "整" };
public readonly string[] CHINANUM = { "零", "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖" };
//个位因为没有单位所以是空字符
public readonly string[] CHINABIT = { string.Empty, "拾", "佰", "仟", "万", "亿", "兆" };
// 主方法将钱的数额传入返回大写中文
public string ToMoneyCNString(decimal money)
{
string[] unit = RMBUNIT;
string[] moneySplit = money.ToString().Split('.');
string intValue = string.Empty, minValue = string.Empty;

//转换小数点前“元”部分
if (moneySplit.Length > 0)
intValue = ToNumCNString(moneySplit[0].ToCharArray());
if (intValue.Length > 0)
intValue += unit[0];
//转换小数点后“角”和“分”部分
if (moneySplit.Length > 1)
for (int i = 0; i < moneySplit[1].Length; i++)
minValue += CHINANUM[Convert.ToInt16(moneySplit[1][i].ToString())] + unit[i + 1];
return intValue + minValue + unit[3];
}

/// 将数字转换为中文大写数字
public string ToNumCNString(long num)
{
return ToNumCNString(num.ToString().ToCharArray());
}

public string ToNumCNString(char[] num)
{
int index = 0;
string strBig = string.Empty;

do
{
strBig += ToNumCNString(num, ref index);
} while (num.Length > 1 && index < num.Length - 1);

return strBig;
}

public string ToNumCNString(char[] num, ref int index)
{
char[] numChr = num;
string strBig = string.Empty;
string toChrZero = CHINANUM[0];
string bit = CHINABIT[firstCNStringIndex(minLen(numChr.Length - index))];
List<int> maxBit = readMaxBit(num);
bool blBit = false;
for (int i = index; i < numChr.Length; i++)
{
//如果当前数字是0，就要判断0是不是在最靠近他的单位位置
string cnBit = firstCNString(numChr.Length - i);
int bitIndex = firstCNStringIndex(minLen(numChr.Length - index));
index = i;
if (bit != CHINABIT[bitIndex])
return strBig;

//判断如果是0同时又\是本位最大位或者等于万位要加单位(因为都是万位向上进)
if ('0' == numChr[i] &&
!string.IsNullOrEmpty(strBig) &&
(cnBit == bit || isBit(maxBit, cnBit)))
{
blBit = true;
strBig += cnBit;
}
else if ('0' != numChr[i])
{
strBig += CHINANUM[Convert.ToInt16(numChr[i].ToString())] + cnBit;
}

if ('0' == numChr[i] && !strBig.EndsWith(toChrZero))
if (cnBit == bit && !string.IsNullOrEmpty(strBig) ||
string.IsNullOrEmpty(cnBit) ||
i + 1 < numChr.Length && '0' != numChr[i + 1])
if (!blBit)
strBig += toChrZero;

blBit = false;
}
strBig = removeLastZero(strBig);
return strBig;
}

private bool isBit(List<int> list, string bit)
{
foreach (int node in list)
if (bit == CHINABIT[node])
return true;

return false;
}

private List<int> readMaxBit(char[] num)
{
List<int> list = new List<int>();
for (int i = 0; i < num.Length; i++)
{
int max = firstCNStringIndex(minLen(num.Length - i));
max = max > 4 ? max - 1 : 4;
list.Add(max);
}

return list;
}

private string removeLastZero(string strBig)
{
if (strBig.EndsWith(CHINANUM[0]))
strBig = strBig.Remove(strBig.Length - 1);

return strBig;
}

private int firstCNStringIndex(int index)
{
switch (index)
{
case 1:
return 0;
case 2:
return 1;
case 3:
return 2;
case 4:
return 3;
case 5:
return 4;
case 9:
return 5;
case 17:
return 6;
}

return -1;
}

private int firstCNStringLen(int len)
{
int index = firstCNStringIndex(len);
if (index < 0)
index = firstCNStringLen(len - minLen(len) + 1);

return index;
}

/// 查找单位是什么（佰，仟 等）传入的参数就是需要转换数字的位数长度（如100就是3）
private string firstCNString(int len)
{
if (0 == len)
return string.Empty;
int index = firstCNStringLen(len);

return CHINABIT[index];
}

/// 查找最靠近的单位的长度
private int minLen(int len)
{
int fontValue = 5;
int returnValue = 5;
while (true)
{
returnValue += (returnValue - 1);
if (returnValue > len)
return fontValue;
fontValue = returnValue;
}
}