Delegate Manipulation using VB.NET
we can reference multiple delegates by referencing one delegate
VB.NET Framework use a function pointer in the form of type safe. we specify a method and object in delegates to call the method. you use instances of the delegate as the reference to the another delegate. Hence we can reference multiple delegates by referencing one delegate. If the chain Reference is not null the delegates invoked one by one till the list is complete.
You can learn delegate manipulation by studying this code:
Example
Module Module1
Public Class del
Public Delegate Function simpleDelegate(ByVal a As Integer, ByVal b As Integer) As Integer
Public Function multiplynumber(ByVal a As Integer, ByVal b As Integer) As Integer
Return (a * b)
End Function
Public Function subtractnumber(ByVal a As Integer, ByVal b As Integer) As Integer
Return (a - b)
End Function
Public Shared Sub Main()
Dim obj As New del
Dim addDelegate As New simpleDelegate(AddressOf obj.multiplynumber)
Dim mulDelegate As New simpleDelegate(AddressOf obj.subtractnumber)
Dim multiply As Integer = addDelegate(23, 43)
Dim subtract As Integer = mulDelegate(20, 9)
Console.WriteLine("Result by first delegate: {0}", multiply)
Console.WriteLine("Result by second delegate: {0}", subtract)
Console.ReadLine()
End Sub
End Class
End Module
Output
CONCLUSION
This article helps you to understand about the declaration and implementation of delegates in Vb.Net