Please Explain me about Delegates
- Thread starter chandru
- Start date
I'm not a pro, by here's my explanation (hope it helps):
How to you call another function without knowing its name? Just like you receive a variable ByRef without its name, you can do that with subs & functions. They are "safe" function pointers, or delegates.
If you want to create a delegate for a function, do this:
and receive such a delegate by:
If someone calls MySub, they should do this:
Hope this helps, and please correct any problems.
How to you call another function without knowing its name? Just like you receive a variable ByRef without its name, you can do that with subs & functions. They are "safe" function pointers, or delegates.
If you want to create a delegate for a function, do this:
VB.NET:
Public Delegate Sub MyDelegate(ByVal arg1 As Integer)
VB.NET:
Public Sub MySub(ByVal del As MyDelegate)If someone calls MySub, they should do this:
VB.NET:
MySub(New MyDelegate(AddressOf AnotherSubWithTheRightArguments))Hope this helps, and please correct any problems.
i think delegates are required for cross thread calls too
Delegates are also used by events. When an event is declared VB.Net creates a hidden delegate by same signature. It's the invocation list of this delegate that all subscribed instance methods are added to or removed from through WithEvents/AddHandler/RemoveHandler, and all these methods are called (invoked) in succession when the event is raised.
cjard
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Hi Friends, Thank you very much for your support.The approach is simple and at the same time effective to learn about delegates.Thanking you all for the help. have a great dayRegardschandru
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