How to: Invoke a Delegate Method (Visual Basic)

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.

   VB

   Delegate Sub MySubDelegate(ByVal x As Integer)
   

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

   VB

   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.

   VB

   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

• Delegate Statement
• Delegates
• Events
• Multithreaded Applications