C#数字金额转成大写汉字

/// <summary>
/// 转换数字金额主函数（包括小数）
/// </summary>
/// <param name="str">数字字符串</param>
/// <returns>转换成中文大写后的字符串或者出错信息提示字符串</returns>
public string ConvertSum(string str)
{
if (!IsPositveDecimal(str))
return "格式错误!";
if (Double.Parse(str) > 999999999999.99)
return "金额溢出";
char[] ch = new char[1];
ch[0] = '.'; //小数点
string[] splitstr = null; //定义按小数点分割后的字符串数组
splitstr = str.Split(ch[0]);//按小数点分割字符串
if (splitstr.Length == 1) //只有整数部分
return ConvertData(str) + "圆整";
else //有小数部分
{
string rstr;
rstr = ConvertData(splitstr[0]) + "圆";//转换整数部分
string xiaoshu = ConvertXiaoShu(splitstr[1]);
rstr += (xiaoshu == "") ? "整" : xiaoshu;//转换小数部分
return rstr;
}

}
/// <summary>
/// 判断是否是正数字字符串
/// </summary>
/// <param name="str"> 判断字符串</param>
/// <returns>如果是数字，返回true，否则返回false</returns>
public bool IsPositveDecimal(string str)
{
Decimal d;
try
{
d = Decimal.Parse(str);

}
catch (Exception)
{
return false;
}
if (d > 0)
return true;
else
return false;
}
/// <summary>
/// 转换数字（整数）
/// </summary>
/// <param name="str">需要转换的整数数字字符串</param>
/// <returns>转换成中文大写后的字符串</returns>
public string ConvertData(string str)
{
string tmpstr = "";
string rstr = "";
int strlen = str.Length;
if (strlen <= 4)//数字长度小于四位
{
rstr = ConvertDigit(str);

}
else
{

if (strlen <= 8)//数字长度大于四位，小于八位
{
tmpstr = str.Substring(strlen - 4, 4);//先截取最后四位数字
rstr = ConvertDigit(tmpstr);//转换最后四位数字
tmpstr = str.Substring(0, strlen - 4);//截取其余数字
//将两次转换的数字加上萬后相连接
rstr = String.Concat(ConvertDigit(tmpstr) + "萬", rstr);
rstr = rstr.Replace("零萬", "萬");
rstr = rstr.Replace("零零", "零");

}
else
if (strlen <= 12)//数字长度大于八位，小于十二位
{
tmpstr = str.Substring(strlen - 4, 4);//先截取最后四位数字
rstr = ConvertDigit(tmpstr);//转换最后四位数字
tmpstr = str.Substring(strlen - 8, 4);//再截取四位数字
rstr = String.Concat(ConvertDigit(tmpstr) + "萬", rstr);
tmpstr = str.Substring(0, strlen - 8);
rstr = String.Concat(ConvertDigit(tmpstr) + "億", rstr);
rstr = rstr.Replace("零億", "億");
rstr = rstr.Replace("零萬", "零");
rstr = rstr.Replace("零零", "零");
rstr = rstr.Replace("零零", "零");
}
}
strlen = rstr.Length;
if (strlen >= 2)
{
switch (rstr.Substring(strlen - 2, 2))
{
case "佰零": rstr = rstr.Substring(0, strlen - 2) + "佰"; break;
case "仟零": rstr = rstr.Substring(0, strlen - 2) + "仟"; break;
case "萬零": rstr = rstr.Substring(0, strlen - 2) + "萬"; break;
case "億零": rstr = rstr.Substring(0, strlen - 2) + "億"; break;

}
}

return rstr;
}

/// <summary>
/// 转换数字（小数部分）
/// </summary>
/// <param name="str">需要转换的小数部分数字字符串</param>
/// <returns>转换成中文大写后的字符串</returns>
public string ConvertXiaoShu(string str)
{
int strlen = str.Length;
string rstr;
if (strlen == 1)
{
rstr = ConvertChinese(str) + "角";
return rstr;
}
else
{
string tmpstr = str.Substring(0, 1);
rstr = ConvertChinese(tmpstr) + "角";
tmpstr = str.Substring(1, 1);
rstr += ConvertChinese(tmpstr) + "分";
rstr = rstr.Replace("零分", "");
rstr = rstr.Replace("零角", "");
return rstr;
}

}

/// <summary>
/// 转换数字
/// </summary>
/// <param name="str">转换的字符串（四位以内）</param>
/// <returns></returns>
public string ConvertDigit(string str)
{
int strlen = str.Length;
string rstr = "";
switch (strlen)
{
case 1: rstr = ConvertChinese(str); break;
case 2: rstr = Convert2Digit(str); break;
case 3: rstr = Convert3Digit(str); break;
case 4: rstr = Convert4Digit(str); break;
}
rstr = rstr.Replace("拾零", "拾");
strlen = rstr.Length;

return rstr;
}

/// <summary>
/// 转换四位数字
/// </summary>
public string Convert4Digit(string str)
{
string str1 = str.Substring(0, 1);
string str2 = str.Substring(1, 1);
string str3 = str.Substring(2, 1);
string str4 = str.Substring(3, 1);
string rstring = "";
rstring += ConvertChinese(str1) + "仟";
rstring += ConvertChinese(str2) + "佰";
rstring += ConvertChinese(str3) + "拾";
rstring += ConvertChinese(str4);
rstring = rstring.Replace("零仟", "零");
rstring = rstring.Replace("零佰", "零");
rstring = rstring.Replace("零拾", "零");
rstring = rstring.Replace("零零", "零");
rstring = rstring.Replace("零零", "零");
rstring = rstring.Replace("零零", "零");
return rstring;
}
/// <summary>
/// 转换三位数字
/// </summary>
public string Convert3Digit(string str)
{
string str1 = str.Substring(0, 1);
string str2 = str.Substring(1, 1);
string str3 = str.Substring(2, 1);
string rstring = "";
rstring += ConvertChinese(str1) + "佰";
rstring += ConvertChinese(str2) + "拾";
rstring += ConvertChinese(str3);
rstring = rstring.Replace("零佰", "零");
rstring = rstring.Replace("零拾", "零");
rstring = rstring.Replace("零零", "零");
rstring = rstring.Replace("零零", "零");
return rstring;
}
/// <summary>
/// 转换二位数字
/// </summary>
public string Convert2Digit(string str)
{
string str1 = str.Substring(0, 1);
string str2 = str.Substring(1, 1);
string rstring = "";
rstring += ConvertChinese(str1) + "拾";
rstring += ConvertChinese(str2);
rstring = rstring.Replace("零拾", "零");
rstring = rstring.Replace("零零", "零");
return rstring;
}
/// <summary>
/// 将一位数字转换成中文大写数字
/// </summary>
public string ConvertChinese(string str)
{
//"零壹贰叁肆伍陆柒捌玖拾佰仟萬億圆整角分"
string cstr = "";
switch (str)
{
case "0": cstr = "零"; break;
case "1": cstr = "壹"; break;
case "2": cstr = "贰"; break;
case "3": cstr = "叁"; break;
case "4": cstr = "肆"; break;
case "5": cstr = "伍"; break;
case "6": cstr = "陆"; break;
case "7": cstr = "柒"; break;
case "8": cstr = "捌"; break;
case "9": cstr = "玖"; break;
}
return (cstr);
}