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  1. using System;
  2. using System.Linq;
  3. using System.Collections.Generic;
  4.  
  5. class Item{
  6.    public string ItemName { get; set; }
  7.    public string GroupName { get; set; }
  8. }
  9.  
  10. public class Test
  11. {
  12. 	public static void Main()
  13. 	{
  14.             List<Item> webservice = new List<Item>() { 
  15.                 new Item(){ItemName="Item1",GroupName="A"},
  16.                 new Item(){ItemName="Item2",GroupName="B"},
  17.                 new Item(){ItemName="Item3",GroupName="B"},
  18.                 new Item(){ItemName="Item4",GroupName="A"},
  19.                 new Item(){ItemName="Item5",GroupName="A"},
  20.             };
  21.             var groupItems =
  22.                 webservice.Where(i => i.GroupName != null)
  23.                           .GroupBy(i => i.GroupName)
  24.                           .Select(grp => new { Group=grp.Key,Items=grp.ToList()});
  25.             foreach (var groupItem in groupItems)
  26.                 Console.WriteLine("Groupname: {0} Items: {1}"
  27.                     , groupItem.Group
  28.                     , string.Join(",", groupItem.Items.Select(i => i.ItemName).ToArray()));	
  29. 	}
  30. }
Success #stdin #stdout 0.05s 37184KB
comments ()
stdin
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Standard input is empty
stdout
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Groupname: A Items: Item1,Item4,Item5
Groupname: B Items: Item2,Item3
https://ideone.com/R3jjZ
language:
C# (gmcs 5.20.1)
created:
12 years ago
visibility:
public

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