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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Text.RegularExpressions;
  4.  
  5.     class Program
  6.     {
  7.         static void Main(string[] args)
  8.         {
  9.             var p = new Product("A123456", "hogehoge");
  10.             Console.WriteLine(p.ToString("%y年%m月%d日 - %c - %n"));
  11.             Console.ReadKey();
  12.  
  13.         }
  14.     }
  15.  
  16.     class SymbolTranslator
  17.     {
  18.         private Dictionary<string, Func<string>> mRuleTable 
  19.             = new Dictionary<string, Func<string>>();
  20.  
  21.         public void AddRule(string symbol, Func<string> func)
  22.         {
  23.             mRuleTable.Add(symbol, func);
  24.         }
  25.  
  26.         public void AddRule(string symbol, string translation)
  27.         {
  28.             mRuleTable.Add(symbol, () => translation);
  29.         }
  30.  
  31.         public string Translate(string symbol)
  32.         {
  33.             return mRuleTable.ContainsKey(symbol) ? mRuleTable[symbol]() : symbol;
  34.         }
  35.     }
  36.  
  37.     class Product : IFormattable
  38.     {
  39.         SymbolTranslator mTranslator = new SymbolTranslator();
  40.  
  41.         public Product(string code, string name)
  42.         {
  43.             Code = code; Name = name;
  44.             mTranslator.AddRule("c", code);
  45.             mTranslator.AddRule("n", name);
  46.             mTranslator.AddRule("y", () => DateTime.Now.ToString("yyyy"));
  47.             mTranslator.AddRule("m", () => DateTime.Now.ToString("MM"));
  48.             mTranslator.AddRule("d", () => DateTime.Now.ToString("dd"));
  49.  
  50.         }
  51.  
  52.         public string Code { get; private set; }
  53.         public string Name { get; private set; }
  54.  
  55.         // Object.ToStringのオーバーライド
  56.         public override string ToString()
  57.         {
  58.             // 書式と書式プロバイダを指定せずにToStringを呼ぶ
  59.             return ToString("", null);
  60.         }
  61.  
  62.         public string ToString(string format)
  63.         {
  64.             // 書式プロバイダを指定せずにToStringを呼ぶ
  65.             return ToString(format, null);
  66.         }
  67.         public string ToString(string format, IFormatProvider formatProvider)
  68.         {
  69.             var regex = new Regex(@"(?<pre>[^%]*)%(?<symbol>[^%])");
  70.             return regex.Replace(format, Evaluator);
  71.         }
  72.  
  73.         private string Evaluator(Match m)
  74.         {
  75.             return m.Groups["pre"].Value + mTranslator.Translate(m.Groups["symbol"].Value);
  76.         }
  77.     }
  78.  
Success #stdin #stdout 0.08s 21804KB
comments (?)
stdin 
Standard input is empty
stdout 
2020年02月02日 - A123456 - hogehoge
https://ideone.com/Ck6bNl
language:
C# (gmcs 5.20.1)
created:
4 years ago
visibility:
public

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