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New Message on BDOTNET
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From: Ritesh_Kesharwani
Message 4 in Discussion
Hi, See the Example of Delegate.. Delegates is perhaps one of the powerful feature
.NET has introduced in C#, VB.NET and other languages. Delegates serve the same
purpose as function pointers in c++ but they are type-safe. Delegates can be used in
many ways, the following example shows the use of delegates as function pointers.
Option Strict Off 'This Option tells the compiler not to check Type conversions
Imports system
Imports microsoft.visualbasic
Class MyDelegate
Delegate Sub dg()
Shared Sub main()
'Declare variables of delegate type
Dim i dg
'make i point the sub Hi
i = AddressOf Hi <o:p></o:p>
End Sub
Shared Sub Hi()
msgbox("Hi")
End Sub
End Class<o:p></o:p>
This code when compiled and run would result into a message box displaying "HI"
Delegates could also point to two function, sounds interesting check this
out.<o:p></o:p>
Option Strict Off 'This Option tells the compiler not to check Type conversions
Imports system
Imports microsoft.visualbasic
Class MyDelegate
Delegate Sub dg()
Shared Sub main()
'Declare variables of delegate type
Dim i, a, y As dg
'make i point the sub Hi
i = AddressOf Hi
'make a point to Bye
a = AddressOf Bye
'combine the two delegates
y = System.Delegate.Combine(i, a)
'invoke the delegate
y()
End Sub
Shared Sub Hi()
msgbox("Hi")
End Sub
Shared Sub Bye()
msgbox("Bye")
End Sub
End Class
This code when compiled and run will result in Two Message boxes invoked from the same
delegate y().
Regard's
Ritesh Kesharwani
Aditi Technology Pvt. Ltd. Bangalore.
<o:p></o:p>
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