Enumerable.GroupBy groups the elements of a sequence according to a specified key selector function and projects the elements for each group by using a specified function. : Enumerable « Data Structure « VB.Net

1. VB.Net
2. Data Structure
3. Enumerable

Enumerable.GroupBy groups the elements of a sequence according to a specified key selector function and projects the elements for each group by using a specified function.

 


Imports System
Imports System.Linq
Imports System.Collections.Generic
    Structure Pet
        Public Name As String
        Public Age As Integer
    End Structure



Public Class Example

    Public Shared Sub Main() 
        Dim pets As New List(Of Pet)(New Pet() _
                                     {New Pet With {.Name = "Barley", .Age = 8}, _
                                      New Pet With {.Name = "Boots", .Age = 4}, _
                                      New Pet With {.Name = "Whiskers", .Age = 1}, _
                                      New Pet With {.Name = "Daisy", .Age = 4}})

        Dim query As IEnumerable(Of IGrouping(Of Integer, String)) = _
            pets.GroupBy(Function(pet) pet.Age, _
                         Function(pet) pet.Name)

        For Each petGroup As IGrouping(Of Integer, String) In query
            Console.WriteLine(petGroup.Key)
            For Each name As String In petGroup
                Console.WriteLine("  " & name)
            Next
        Next

    End Sub
End Class

   
  

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