asp.net 转换人民币大小金额

using system;
using system.collections.generic;
using system.text;

namespace common
{
/// <summary>
/// 转换人民币大小金额。
/// </summary>
public class rmb
{
/// <summary>
/// 转换人民币大小金额
/// </summary>
/// <param name="num">金额</param>
/// <returns>返回大写形式</returns>
public static string cmycurd(decimal num)
{
string str1 = "零壹贰叁肆伍陆柒捌玖"; //0-9所对应的汉字
string str2 = "万仟佰拾亿仟佰拾万仟佰拾元角分"; //数字位所对应的汉字
string str3 = ""; //从原num值中取出的值
string str4 = ""; //数字的字符串形式
string str5 = ""; //人民币大写金额形式
int i; //循环变量
int j; //num的值乘以100的字符串长度
string ch1 = ""; //数字的汉语读法
string ch2 = ""; //数字位的汉字读法
int nzero = 0; //用来计算连续的零值是几个
int temp; //从原num值中取出的值

num = math.round(math.abs(num), 2); //将num取绝对值并四舍五入取2位小数
str4 = ((long)(num * 100)).tostring(); //将num乘100并转换成字符串形式
j = str4.length; //找出最高位
if (j > 15) { return "溢出"; }
str2 = str2.substring(15 - j); //取出对应位数的str2的值。如：200.55,j为5所以str2=佰拾元角分

//循环取出每一位需要转换的值
for (i = 0; i < j; i++)
{
str3 = str4.substring(i, 1); //取出需转换的某一位的值
temp = convert.toint32(str3); //转换为数字
if (i != (j - 3) && i != (j - 7) && i != (j - 11) && i != (j - 15))
{
//当所取位数不为元、万、亿、万亿上的数字时
if (str3 == "0")
{
ch1 = "";
ch2 = "";
nzero = nzero + 1;
}
else
{
if (str3 != "0" && nzero != 0)
{
ch1 = "零" + str1.substring(temp * 1, 1);
ch2 = str2.substring(i, 1);
nzero = 0;
}
else
{
ch1 = str1.substring(temp * 1, 1);
ch2 = str2.substring(i, 1);
nzero = 0;
}
}
}
else
{
//该位是万亿，亿，万，元位等关键位
if (str3 != "0" && nzero != 0)
{
ch1 = "零" + str1.substring(temp * 1, 1);
ch2 = str2.substring(i, 1);
nzero = 0;
}
else
{
if (str3 != "0" && nzero == 0)
{
ch1 = str1.substring(temp * 1, 1);
ch2 = str2.substring(i, 1);
nzero = 0;
}
else
{
if (str3 == "0" && nzero >= 3)
{
ch1 = "";
ch2 = "";
nzero = nzero + 1;
}
else
{
if (j >= 11)
{
ch1 = "";
nzero = nzero + 1;
}
else
{
ch1 = "";
ch2 = str2.substring(i, 1);
nzero = nzero + 1;
}
}
}
}
}
if (i == (j - 11) || i == (j - 3))
{
//如果该位是亿位或元位，则必须写上
ch2 = str2.substring(i, 1);
}
str5 = str5 + ch1 + ch2;

if (i == j - 1 && str3 == "0")
{
//最后一位（分）为0时，加上“整”
str5 = str5 + '整';
}
}
if (num == 0)
{
str5 = "零元整";
}
return str5;
}


/// <summary>
/// 转换人民币大小金额 (一个重载，将字符串先转换成数字在调用cmycurd)
/// </summary>
/// <param name="num">用户输入的金额，字符串形式未转成decimal</param>
/// <returns></returns>
public static string cmycurd(string numstr)
{
try
{
decimal num = convert.todecimal(numstr);
return cmycurd(num);
}
catch
{
return "非数字形式！";
}
}
}

}