Func with user-defined function : Func « LINQ « VB.Net






  1. VB.Net
  2. LINQ
  3. Func

Func with user-defined function

  

Imports System.Collections.Generic
Imports System.Linq
Imports System.Runtime.CompilerServices


Public Class Role
    Public ID As Integer
    Public RoleDescription As String
End Class

Public Class Person
    Public ID As Integer
    Public IDRole As Integer
    Public LastName As String
    Public FirstName As String
End Class


Module Module1

    Sub Main()
        Dim people As New List(Of Person)(New Person() { _
            New Person With {.ID = 1, .IDRole = 1, .LastName = "A", .FirstName = "Brad"}, _
            New Person With {.ID = 2, .IDRole = 2, .LastName = "G", .FirstName = "Tom"} _
        })

        Dim roles As New List(Of Role)(New Role() { _
            New Role With {.ID = 1, .RoleDescription = "Manager"}, _
            New Role With {.ID = 2, .RoleDescription = "Developer"} _
        })
        Dim predicate As New Func(Of Person, Boolean)(AddressOf wherePredicate)
        Dim query = people.Where(predicate)

    End Sub

    Public Function wherePredicate(ByVal p As Person) As Boolean
        Return p.ID = 1
    End Function
End Module








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2.Using Func to do filter 2