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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4.  
  5. public class Test
  6. {
  7. 	public static void Main()
  8. 	{
  9. 		var fooList = new List<Foo>()
  10. 		{
  11. 			new Foo(){First = "a1", Second="b1", Third="c1", Fourth="v1"},
  12. 			new Foo(){First = "a1", Second="b1", Third="c1", Fourth="v2"},
  13. 			new Foo(){First = "a1", Second="b1", Third="c2", Fourth="v4"},
  14. 			new Foo(){First = "a1", Second="b1", Third="c3", Fourth="v3"},
  15. 			new Foo(){First = "a1", Second="b1", Third="c3", Fourth="v4"}
  16. 		};
  17.  
  18. 		var searchText = "v4";
  19.  
  20. 		var filteredFooList = fooList.GroupBy(foo => foo.Third)
  21. 			.Where(groupedFoo => groupedFoo.Any(foo => foo.Fourth == searchText))
  22. 			.SelectMany(groupedFoo => groupedFoo).ToList();
  23.  
  24. 		foreach (var item in filteredFooList)
  25. 		{
  26. 			Console.WriteLine($"{item.First} {item.Second} {item.Third} {item.Fourth}");
  27. 		}
  28. 	}
  29.  
  30. 	public class Foo
  31. 	{
  32. 		public string First { get; set; }
  33. 		public string Second { get; set; }
  34. 		public string Third { get; set; }
  35. 		public string Fourth { get; set; }
  36. 	}
  37. }
Success #stdin #stdout 0.01s 29928KB
comments (?)
stdin 
Standard input is empty
stdout 
a1 b1 c2 v4
a1 b1 c3 v3
a1 b1 c3 v4
https://ideone.com/dH9JRK
SO Example- linq query proper way to filter
language:
C# (gmcs 5.20.1)
created:
8 years ago
visibility:
secret

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