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  1. using System;
  2. using System.Linq;
  3. using System.Collections.Generic;
  4.  
  5. class DateItem {
  6.    public DateTime? Date;
  7.    public int OtherField;
  8.    // other fields
  9. }
  10.  
  11. public class Test
  12. {
  13. 	public static void Main()
  14. 	{
  15. 	   var list = new List<DateItem>();
  16.            list.Add(new DateItem() { Date = new DateTime(2012, 01, 12), OtherField=500 });
  17.            list.Add(new DateItem() { Date = new DateTime(2012, 01, 12), OtherField=700 });
  18.            list.Add(new DateItem() { Date = new DateTime(2012, 01, 15), OtherField=900 });
  19.            list.Add(new DateItem() { Date = new DateTime(2012, 01, 15), OtherField=1100 });
  20.            list.Add(new DateItem() { Date = new DateTime(2012, 01, 27), OtherField=2000 });
  21.  
  22.             var dups = list.Select((Item,Index) => new{Item,Index})
  23.                            .GroupBy(x => x.Item.Date)
  24.                            .Where(g => g.Count() > 1);
  25.             foreach(var dup in dups)
  26.             {
  27.                 foreach (var nullable in dup.OrderBy(x => x.Item.Date).Skip(1))
  28.                 {
  29.                     list[nullable.Index].Date = null;  // assuming DateTime?
  30.                 }
  31.             }
  32.  
  33.             var result = String.Join(Environment.NewLine, list.Select(i => string.Format("{0} {1}", 
  34.                 i.Date.HasValue ? i.Date.Value.ToShortDateString() : "null", i.OtherField)).ToArray());
  35.             Console.Write(result);
  36. 	}
  37. }
Success #stdin #stdout 0.06s 37248KB
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stdin
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Standard input is empty
stdout
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1/12/2012 500
null 700
1/15/2012 900
null 1100
1/27/2012 2000
https://ideone.com/cVL4G
language:
C# (gmcs 5.20.1)
created:
13 years ago
visibility:
public

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