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  1. using System;
  2. using System.Linq;
  3. using System.Collections.Generic;
  4.  
  5. public class Test
  6. {
  7. 	interface IId {int Id {get;}}
  8. 	class A : IId {
  9. 		public int Id {get;set;}
  10. 		public override string ToString() {
  11. 			return "A"+Id;
  12. 		}
  13. 	}
  14. 	class B : IId {
  15. 		public int Id {get;set;}
  16. 		public override string ToString() {
  17. 			return "B"+Id;
  18. 		}
  19. 	}
  20. 	public static void Main() {
  21. 		var a = new List<A> {new A {Id=5}, new A {Id=6}};
  22. 		var b = new List<B> {new B {Id=7}, new B {Id=8}};
  23. 		var all = new List<IEnumerable<IId>> {a, b};
  24. 		var item3 = all.SelectMany(list => list).FirstOrDefault(item => item.Id == 3);
  25. 		var item5 = all.SelectMany(list => list).FirstOrDefault(item => item.Id == 5);
  26. 		var item7 = all.SelectMany(list => list).FirstOrDefault(item => item.Id == 7);
  27. 		Console.WriteLine("3:'{0}' 5:'{1}' 7:'{2}'", item3, item5, item7);
  28. 	}
  29. }
Success #stdin #stdout 0.04s 24264KB
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stdin
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Standard input is empty
stdout
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3:'' 5:'A5' 7:'B7'
https://ideone.com/BvfUfr
language:
C# (gmcs 5.20.1)
created:
9 years ago
visibility:
public

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