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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4.  
  5. public class Test
  6. {
  7.     class Device
  8.     {
  9.         public List<string> Interfaces { get; set; }
  10.     }
  11.  
  12.     static List<Device> allDevices = new List<Device>() 
  13.     { 
  14.         new Device{Interfaces=new List<string>{"1","2","3"}},new Device{Interfaces=new List<string>{"1","2","3"}},
  15.         new Device{Interfaces=new List<string>{"1","NO!","3"}},new Device{Interfaces=new List<string>{"1","2","3"}},
  16.         new Device{Interfaces=new List<string>{"1","2","3"}},new Device{Interfaces=new List<string>{"1","2","3"}},
  17.     };
  18.  
  19. 	public static void Main()
  20. 	{
  21.         IEnumerable<string> commonSubset = new List<string>(allDevices.First().Interfaces);
  22.         foreach (List<string> interfaces in allDevices.Skip(1).Select(d => d.Interfaces))
  23.         {
  24.             commonSubset = commonSubset.Intersect(interfaces);
  25.             if (!commonSubset.Any())
  26.                 break;
  27.         }
  28.  
  29.         Console.Write(String.Join(",", commonSubset.ToArray()));
  30. 	}
  31. }
Success #stdin #stdout 0.03s 33896KB
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1,3
https://ideone.com/Jbj8Uk
language:
C# (gmcs 5.20.1)
created:
12 years ago
visibility:
public

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