.NET转换编号以串重新presentation（1到1，2到二，等...）

问题描述

是否有一个内置的方法在.NET来转换一个数字到数字的字符串再presentation？例如，1变成1，2变成两个等

Is there a built in method in .NET to convert a number to the string representation of the number? For example, 1 becomes one, 2 becomes two, etc.

推荐答案

我一直是递归方法的粉丝

I've always been a fan of the recursive method

  public static string NumberToText( int n)
  {
   if ( n < 0 )
      return "Minus " + NumberToText(-n);
   else if ( n == 0 )
      return "";
   else if ( n <= 19 )
      return new string[] {"One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", 
         "Nine", "Ten", "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", 
         "Seventeen", "Eighteen", "Nineteen"}[n-1] + " ";
   else if ( n <= 99 )
      return new string[] {"Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", 
         "Eighty", "Ninety"}[n / 10 - 2] + " " + NumberToText(n % 10);
   else if ( n <= 199 )
      return "One Hundred " + NumberToText(n % 100);
   else if ( n <= 999 )
      return NumberToText(n / 100) + "Hundreds " + NumberToText(n % 100);
   else if ( n <= 1999 )
      return "One Thousand " + NumberToText(n % 1000);
   else if ( n <= 999999 )
      return NumberToText(n / 1000) + "Thousands " + NumberToText(n % 1000);
   else if ( n <= 1999999 )
      return "One Million " + NumberToText(n % 1000000);
   else if ( n <= 999999999)
      return NumberToText(n / 1000000) + "Millions " + NumberToText(n % 1000000);
   else if ( n <= 1999999999 )
      return "One Billion " + NumberToText(n % 1000000000);
   else 
      return NumberToText(n / 1000000000) + "Billions " + NumberToText(n % 1000000000);
}

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