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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Text;
  5.  
  6. public class Test
  7. {
  8. 	public static void Main()
  9. 	{
  10. 		List<int> list1 = new List<int>() {1,2,3};
  11. 		List<int> list2 = null;
  12.  
  13. 		var agg = list1.Concat(list2.NeverNull());
  14. 	}
  15. }
  16.  
  17. public static class Extensions
  18. {
  19. 	public static IEnumerable<T> NeverNull<T>(this IEnumerable<T> list)
  20. 	{
  21. 		return list ?? Enumerable.Empty<T>();
  22. 	}
  23. }
  24.  
Success #stdin #stdout 0.01s 33632KB
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https://ideone.com/kblz2t
language:
C# (gmcs 5.20.1)
created:
11 years ago
visibility:
public

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