The actual application of Delegate.

The following code simplifies code writing by representing the meta-Delegate. Different meta-representing methods will be called at runtime, and corresponding running results will be displayed.
In VB. NET, it indicates that the meta-Delegate is somewhat similar to the pointer in C language, that is, it allows the user to transmit a Process reference and then call these referenced processes. This is a powerful programming technology that allows users to call corresponding processes without the need for If or Select statements. Here, the representative element plays a bridge role.
Create a notebook. The following code is used:
Imports System
Imports System. Windows. Forms
Public Module mymodule
Delegate Sub mydele (ByVal my1 As Int32, ByVal my2 As Int32)
Sub main ()
Dim dele As mydele
Dele = AddressOf my_add
Dele. Invoke (10, 20)
Dele = AddressOf my_sub
Dele. Invoke (10, 20)
Dele = AddressOf my_mul
Dele. Invoke (10, 20)
Dele = AddressOf my_div
Dele. Invoke (10, 20)
End Sub
Public Sub my_add (ByVal num1 As Int32, ByVal num2 As Int32)
MessageBox. Show ("Add:" & (num1 + num2). ToString, "Hello", MessageBoxButtons. OK)
End Sub