格式化为中文数字
namespace Microshaoft
{
using System;
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public class ChineseFormat : System.ICustomFormatter, System.IFormatProvider
{
//如果format Type与当前实例类型相同,则为当前实例,否则为空引用
public object GetFormat(Type format)
{
if (format == typeof (ICustomFormatter))
{
return this;
}
return null;
}
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//实现Format方法说明:
//如果您的格式方法不支持格式,则确定正在设置格式的对象是否实现 IFormattable 接口。
//如果实现,请调用该接口的IFormattable.ToString 方法。
//否则,调用基础对象的默认 Object.ToString 方法。
public string Format(string format, object arg, IFormatProvider provider)
{
if (format == null)
{
if (arg is IFormattable)
{
return ((IFormattable) arg).ToString(format, provider);
}
return arg.ToString();
}
else
{
if (format == "ChineseFormat")
{
string[] Nums = new string[] {"零", "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖"};
//位 数组
string[] Digits = new string[] {"", "拾", "佰", "仟"};
//单位 数组
string[] Units = new string[] {"", "[万]", "[亿]", "[万亿]"};
return ConvertNumberToChinese(arg.ToString(), Nums, Digits, Units);
//return "***"+arg.ToString();
}
else
{
if (arg is IFormattable)
{
return ((IFormattable) arg).ToString(format, provider);
}
return arg.ToString();
}
}
}
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public static string ConvertNumberToChinese(string x, string[] Nums, string[] Digits, string[] Units)
{
string S = ""; //返回值
int p = 0; //字符位置指针
int m = x.Length % 4; //取模
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// 四位一组得到组数
int k = (m > 0 ? x.Length / 4 + 1 : x.Length / 4);
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// 外层循环在所有组中循环
// 从左到右 高位到低位 四位一组 逐组处理
// 每组最后加上一个单位: "[万亿]","[亿]","[万]"
for (int i = k; i > 0; i--)
{
int L = 4;
if (i == k && m != 0)
{
L = m;
}
// 得到一组四位数 最高位组有可能不足四位
string s = x.Substring(p, L);
int l = s.Length;
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// 内层循环在该组中的每一位数上循环 从左到右 高位到低位
for (int j = 0; j < l; j++)
{
//处理改组中的每一位数加上所在位: "仟","佰","拾",""(个)
int n = Convert.ToInt32(s.Substring(j, 1));
if (n == 0)
{
if (j < l - 1
&& Convert.ToInt32(s.Substring(j + 1, 1)) > 0 //后一位(右低)
&& !S.EndsWith(Nums[n]))
{
S += Nums[n];
}
}
else
{
//处理 1013 一千零"十三", 1113 一千一百"一十三"
if (!(n == 1 && (S.EndsWith(Nums[0]) | S.Length == 0) && j == l - 2))
{
S += Nums[n];
}
S += Digits[l - j - 1];
}
}
p += L;
// 每组最后加上一个单位: [万],[亿] 等
if (i < k) //不是最高位的一组
{
if (Convert.ToInt32(s) != 0)
{
//如果所有 4 位不全是 0 则加上单位 [万],[亿] 等
S += Units[i - 1];
}
}
else
{
//处理最高位的一组,最后必须加上单位
S += Units[i - 1];
}
}
return S;
}
}
}
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namespace Test
{
using System;
using Microshaoft;
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class AppTest
{
static void Main()
{
string printString = String.Empty;
long i = 1100000013;
ChineseFormat fmt = new ChineseFormat();
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printString = string.Format(fmt, "显示正常格式: {0}", i);
Console.WriteLine(printString);
printString = string.Format(fmt, "显示正常格式: {0:C}", i);
Console.WriteLine(printString);
printString = string.Format(fmt, "显示自定义格式: {0:ChineseFormat}", i);
Console.WriteLine(printString);
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Console.ReadLine();
}
}
}
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