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  1. using System;
  2.  
  3. class Program
  4.     {
  5.         static void Main()
  6.         {
  7.             var p = new Product()
  8.             {
  9.                 Code = "A123456",
  10.                 Name = "hogehoge"
  11.             };
  12.             Console.WriteLine(p.ToString("%y年%m月%d日 - %c - %n"));
  13.  
  14.             Console.ReadKey();
  15.         }
  16.  
  17.     }
  18.     class Product : IFormattable
  19.     {
  20.         public string Code { get; set; }
  21.         public string Name { get; set; }
  22.  
  23.         // Object.ToStringのオーバーライド
  24.         public override string ToString()
  25.         {
  26.             // 書式と書式プロバイダを指定せずにToStringを呼ぶ
  27.             return ToString("", null);
  28.         }
  29.  
  30.         public string ToString(string format)
  31.         {
  32.             // 書式プロバイダを指定せずにToStringを呼ぶ
  33.             return ToString(format, null);
  34.         }
  35.  
  36.         public string ToString(string format, IFormatProvider formatProvider)
  37.         {
  38.             var isEscape = false;
  39.             var result = "";
  40.             foreach (var f in format)
  41.             {
  42.                 switch (f)
  43.                 {
  44.                     case '%':
  45.                         isEscape = true;
  46.                         continue;
  47.                     case 'c':
  48.                         if (isEscape)
  49.                             result += Code;
  50.                         else
  51.                             result += f;
  52.                         break;
  53.                     case 'n':
  54.                         if (isEscape)
  55.                             result += Name;
  56.                         else
  57.                             result += f;
  58.                         break;
  59.                     case 'y':
  60.                         if (isEscape)
  61.                             result += DateTime.Now.ToString("yyyy");
  62.                         else
  63.                             result += f;
  64.                         break;
  65.                     case 'm':
  66.                         if (isEscape)
  67.                             result += DateTime.Now.ToString("MM");
  68.                         else
  69.                             result += f;
  70.                         break;
  71.                     case 'd':
  72.                         if (isEscape)
  73.                             result += DateTime.Now.ToString("dd");
  74.                         else
  75.                             result += f;
  76.                         break;
  77.                     default:
  78.                         result += f;
  79.                         break;
  80.                 }
  81.                 isEscape = false;
  82.             }
  83.             return result;
  84.         }
  85.     }
Success #stdin #stdout 0.06s 17904KB
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2020年02月02日 - A123456 - hogehoge
https://ideone.com/L4OaZ0
language:
C# (gmcs 5.20.1)
created:
4 years ago
visibility:
public

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