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How to: Invoke a Delegate Method (Visual Basic)

  • Άρθρο

This example shows how to associate a method with a delegate and then invoke that method through the delegate.

Create the delegate and matching procedures

  1. Create a delegate named MySubDelegate.

    Delegate Sub MySubDelegate(ByVal x As Integer)

  2. Declare a class that contains a method with the same signature as the delegate.

    Class class1
    Sub Sub1(ByVal x As Integer)
        MsgBox("The value of x is: " & CStr(x))
    End Sub
End Class

  3. Define a method that creates an instance of the delegate and invokes the method associated with the delegate by calling the built-in Invoke method.

    Protected Sub DelegateTest()
    Dim c1 As New class1
    ' Create an instance of the delegate.
    Dim msd As MySubDelegate = AddressOf c1.Sub1
    ' Call the method.
    msd.Invoke(10)
End Sub

See also