Reference a method that has one parameter and returns a value: Func<(Of <(T, TResult>)>) : Delegate « Class Module « VB.Net Tutorial






  1. VB.Net Tutorial
  2. Class Module
  3. Delegate
Delegate Sub DisplayMessage(message As String) 

Module TestCustomDelegate
   Public Sub Main
      Dim messageTarget As DisplayMessage 

      If Environment.GetCommandLineArgs().Length > 1 Then
         messageTarget = AddressOf ShowWindowsMessage
      Else
         messageTarget = AddressOf Console.WriteLine
      End If
      messageTarget("Hello, World!")
   End Sub

   Private Sub ShowWindowsMessage(message As String)
      MsgBox(message)
   End Sub   
End Module








6.28.Delegate
6.28.1.Define delegate
6.28.2.Define a delegate to be a pointer to a subroutine that has a string parameter.
6.28.3.Use Delegate Sub
6.28.4.Delegate Function
6.28.5.Uses delegates to sort random numbers (ascending or descending)
6.28.6.Use AddressOf to assign function to a delegate
6.28.7.Comparison method based on delegate
6.28.8.Multiple Delegates
6.28.9.Math delegation
6.28.10.Use one Delegate to reference two different functions
6.28.11.Reference a method that has one parameter and returns a value: Func<(Of <(T, TResult>)>)