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  1. using System;
  2. using System.Linq;
  3. using System.Collections.Generic;
  4.  
  5. class ErrorLog
  6. {
  7.     public int Line { get; set; }
  8.     public string Message { get; set; }
  9.  
  10.     public ErrorLog(int line, string message)
  11.     {
  12.     	this.Line = line;
  13.     	this.Message = message;
  14.     }
  15. }
  16.  
  17. class Logger
  18. {
  19.     public static void Write(IEnumerable<ErrorLog> logs)
  20.     {
  21.         string output = string.Join("\n", logs.GroupBy(x => x.Line)
  22.                                               .Select(x => x.Key + "行目：" + string.Join("\n", x.Select(y => y.Message))));
  23.  
  24.         Console.WriteLine(output);
  25.     }
  26. }
  27.  
  28. public class Test
  29. {
  30. 	public static void Main()
  31. 	{
  32. 		var logs = new[]
  33. 		{
  34. 			new ErrorLog(3, "名前の値が不正です"),
  35. 			new ErrorLog(3, "性別の値が不正です"),
  36. 			new ErrorLog(3, "生年月日が不正です"),
  37. 			new ErrorLog(4, "性別の値が不正です"),
  38. 		};
  39. 		Logger.Write(logs);
  40. 	}
  41. }
Success #stdin #stdout 0.05s 24136KB
comments (?)
stdin
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Standard input is empty
stdout
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3行目：名前の値が不正です
性別の値が不正です
生年月日が不正です
4行目：性別の値が不正です
https://ideone.com/XJh6Qo
language:
C# (gmcs 5.20.1)
created:
8 years ago
visibility:
public

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