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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4.  
  5. public class Test
  6. {
  7. 	public List<int> MyList { get; set; }
  8.  
  9.  
  10. 	public static void Main()
  11. 	{
  12. 		Test t = new Test();
  13. 		t.MyList = new List<int>();
  14.  
  15. 		t.MyList.Add(-1);
  16. 		t.MyList.Add(0);
  17. 		t.MyList.Add(1);
  18. 		t.MyList.Add(2);
  19.  
  20. 		int siteNumbers = t.MyList.Where(i => i != -1)
  21.                    .Select(x => x)
  22.                    .Distinct()
  23.                    .Count();
  24.  
  25.         Console.WriteLine(siteNumbers);
  26. 	}
  27. }
Success #stdin #stdout 0.04s 24056KB
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https://ideone.com/LvOe0i
language:
C# (gmcs 5.20.1)
created:
8 years ago
visibility:
public

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