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using System;
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using System.Collections.Generic;
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using System.Text;
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namespace Common
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{
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/// <summary>
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/// double类型拓展
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/// </summary>
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public static class DecimalExtentions
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{
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/// <summary>
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/// 转换为人民币大写 如： 叁亿玖仟柒佰陆拾贰万柒仟肆佰玖拾贰元叁角贰分
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/// </summary>
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/// <param name="num">金额</param>
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/// <returns></returns>
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public static string ToRMBMoney(this double num)
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{
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string str1 = "零壹贰叁肆伍陆柒捌玖"; //0-9所对应的汉字
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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
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string str3 = ""; //从原num值中取出的值
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string str4 = ""; //数字的字符串形式
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string str5 = ""; //人民币大写金额形式
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int i; //循环变量
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int j; //num的值乘以100的字符串长度
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string ch1 = ""; //数字的汉语读法
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string ch2 = ""; //数字位的汉字读法
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int nzero = 0; //用来计算连续的零值是几个
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int temp; //从原num值中取出的值
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num = Math.Round(Math.Abs(num), 2); //将num取绝对值并四舍五入取2位小数
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str4 = ((long)(num * 100)).ToString(); //将num乘100并转换成字符串形式
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j = str4.Length; //找出最高位
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if (j > 15) { return "溢出"; }
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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
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//循环取出每一位需要转换的值
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for (i = 0; i < j; i++)
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{
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str3 = str4.Substring(i, 1); //取出需转换的某一位的值
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temp = Convert.ToInt32(str3); //转换为数字
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if (i != (j - 3) && i != (j - 7) && i != (j - 11) && i != (j - 15))
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{
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//当所取位数不为元、万、亿、万亿上的数字时
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if (str3 == "0")
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{
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ch1 = "";
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ch2 = "";
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nzero = nzero + 1;
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}
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else
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{
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if (str3 != "0" && nzero != 0)
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{
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ch1 = "零" + str1.Substring(temp * 1, 1);
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ch2 = str2.Substring(i, 1);
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nzero = 0;
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}
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else
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{
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ch1 = str1.Substring(temp * 1, 1);
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ch2 = str2.Substring(i, 1);
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nzero = 0;
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}
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}
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}
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else
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{
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//该位是万亿，亿，万，元位等关键位
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if (str3 != "0" && nzero != 0)
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{
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ch1 = "零" + str1.Substring(temp * 1, 1);
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ch2 = str2.Substring(i, 1);
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nzero = 0;
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}
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else
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{
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if (str3 != "0" && nzero == 0)
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{
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ch1 = str1.Substring(temp * 1, 1);
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ch2 = str2.Substring(i, 1);
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nzero = 0;
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}
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else
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{
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if (str3 == "0" && nzero >= 3)
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{
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ch1 = "";
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ch2 = "";
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nzero = nzero + 1;
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}
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else
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{
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if (j >= 11)
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{
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ch1 = "";
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nzero = nzero + 1;
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}
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else
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{
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ch1 = "";
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ch2 = str2.Substring(i, 1);
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nzero = nzero + 1;
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}
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}
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}
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}
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}
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if (i == (j - 11) || i == (j - 3))
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{
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//如果该位是亿位或元位，则必须写上
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ch2 = str2.Substring(i, 1);
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}
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str5 = str5 + ch1 + ch2;
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if (i == j - 1 && str3 == "0")
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{
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//最后一位（分）为0时，加上“整”
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str5 = str5 + '整';
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}
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}
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if (num == 0)
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{
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str5 = "零元整";
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}
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return str5;
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}
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}
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}
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