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  1. using System;
  2. using System.Globalization;
  3. using System.Linq;
  4. using System.Collections.Generic;
  5.  
  6. public class Test
  7. {
  8.     public class Foo
  9.     {
  10.         public int ID { get; set; }
  11.  
  12.         public override int GetHashCode()
  13.         {
  14.             Console.WriteLine("in GetHashCode, ID=" + ID);
  15.             return ID.GetHashCode();
  16.         }
  17.         public override bool Equals(object obj)
  18.         {
  19.             Console.WriteLine("in Equals, ID=" + ID);
  20.             Foo f2 = obj as Foo;
  21.             if (f2 == null) return false;
  22.             return ID == f2.ID;
  23.         }
  24.     }
  25.  
  26. 	public static void Main()
  27. 	{
  28. 		IEnumerable<Foo> list1 = new List<Foo>() { new Foo { ID = 1 }, new Foo { ID = 2 }, new Foo { ID = 3 } };
  29.         IEnumerable<Foo> list2 = new List<Foo>() { new Foo { ID = 2 }, new Foo { ID = 3}, new Foo { ID = 4 } };
  30.         Console.WriteLine("before Intersect");
  31.         IEnumerable<Foo> inBoth = list1.Intersect(list2);
  32.         Console.WriteLine("after Intersect");
  33.  
  34.         foreach (Foo fDup in inBoth)
  35.         {
  36.             // now GetHashCode will be executed 
  37.             Console.WriteLine("in foreach, ID=" + fDup.ID);
  38.         }
  39. 	}
  40. }
Success #stdin #stdout 0.04s 33992KB
comments (?)
stdin
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Standard input is empty
stdout
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before Intersect
after Intersect
in GetHashCode, ID=2
in GetHashCode, ID=3
in GetHashCode, ID=4
in GetHashCode, ID=1
in GetHashCode, ID=2
in Equals, ID=2
in foreach, ID=2
in GetHashCode, ID=3
in Equals, ID=3
in foreach, ID=3
https://ideone.com/ekttH3
language:
C# (gmcs 5.20.1)
created:
12 years ago
visibility:
public

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