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  1. using System;
  2. using System.Linq;
  3.  
  4. public class Test
  5. {
  6. 	public static void Main()
  7. 	{
  8. var products = new [] {
  9. 	new { Name="A", Priority="1", Value=default(string) },
  10. 	new { Name="A", Priority="2", Value=default(string) },
  11. 	new { Name="A", Priority="3", Value="10" },
  12. 	new { Name="A", Priority="4", Value=default(string) },
  13. 	new { Name="A", Priority="5", Value="20" },
  14. 	new { Name="A", Priority="6", Value=default(string) },
  15. 	new { Name="B", Priority="1", Value="15" },
  16. 	new { Name="B", Priority="2", Value=default(string) },
  17. 	new { Name="B", Priority="3", Value="10" },
  18. 	new { Name="B", Priority="4", Value=default(string) },
  19. 	new { Name="B", Priority="5", Value="20" },
  20. 	new { Name="B", Priority="6", Value=default(string) },
  21. };
  22.  
  23. var result = products
  24. 	.GroupBy(p => p.Name)
  25. 	.SelectMany (grp =>
  26. 		grp.OrderBy(p => p.Priority)            // sort by priority
  27. 			.SkipWhile(p => p.Value == null)     // skip null entries at beginnig
  28. 			.Reverse()                           // reverse
  29. 			.SkipWhile(p => p.Value == null)     // skip null entries at end
  30. 			.Reverse()                           // reverse back to normal
  31. 			.Where(p => p.Value == null)        // then find null entries
  32. 	);
  33.  
  34. foreach (var product in result)
  35. {
  36. 	Console.WriteLine("Product(Name=" + product.Name + ",Priority=" + product.Priority + ",Value=" + product.Value + ")");
  37. }
  38. 	}
  39. }
Success #stdin #stdout 0.06s 38360KB
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stdin
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Standard input is empty
stdout
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Product(Name=A,Priority=4,Value=)
Product(Name=B,Priority=2,Value=)
Product(Name=B,Priority=4,Value=)
https://ideone.com/2dU9L
language:
C# (gmcs 5.20.1)
created:
11 years ago
visibility:
public

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