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  1. using System;
  2. using System.Linq;
  3.  
  4. public class Test
  5. {
  6. 	public static void Main()
  7. 	{
  8. var list1 = new[] { new { ID = 1 }, new { ID = 2 }, new { ID = 3 } };
  9. var list2 = new[] {
  10. 	new {
  11. 		ID = 1,
  12. 		Name = "Jason"
  13. 	},
  14. 	new { 
  15. 		ID = 1,
  16. 		Name = "Jim"
  17. 	},
  18. 	new {
  19. 		ID = 2,
  20. 		Name = "Mike"
  21. 	},
  22. 	new {
  23. 		ID = 3,
  24. 		Name = "Phil"
  25. 	}
  26. };
  27.  
  28. var lst = list1
  29. 	// Select distinct IDs that are in both lists:
  30. 	.Where(lst1 => list2
  31. 		.Select(lst2 => lst2.ID)
  32. 		.Contains(lst1.ID))
  33. 	.Distinct()
  34. 	// select items in list 2 matching the IDs above:
  35. 	.Select(lst1 => list2
  36. 		.Where(lst2 => lst2.ID == lst1.ID)
  37. 		.First());		
  38.  
  39.             foreach(var item in lst)
  40.             {
  41.                 Console.WriteLine("ID: {0}, Name: {1}", item.ID, item.Name);
  42.             }
  43. 	}
  44. }
Success #stdin #stdout 0.05s 37224KB
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stdin
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Standard input is empty
stdout
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ID: 1, Name: Jason
ID: 2, Name: Mike
ID: 3, Name: Phil
https://ideone.com/6egSc
language:
C# (gmcs 5.20.1)
created:
13 years ago
visibility:
public

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