Delegates and Events

Question

User1396641445 posted

Hi,  What is the difference b/w Delegates and Events. I have little bit confusion. Where delegates are used, and when we have to used delegates. Can, you give some examples(both delebates and events) in vb.net.

Thanks!

Answer 1

User-1659704165 posted

Hi,

There No keyword Delegate While using event

Event can decalred  in Inteface  But delegate is Not.

event is Class specific and delegate can used who ever can Acess it..

OR

http://blog.monstuff.com/archives/000040.html

chk the abov elink

Answer 2

User-952121411 posted

Check out some of the following links with detailed descriptions and examples in VB.NET:

Visual Basic Language Concepts - Events and Delegates:

http://msdn.microsoft.com/en-us/library/aa903294(VS.71).aspx

VB.NET School - Delegates and Events: 

http://www.programmersheaven.com/2/Les_VBNET_10_p1

Event Handling in VB.NET:

http://devcity.net/Articles/25/1/20020316.aspx

Hope this helps!

 

Answer 3

User1364706731 posted

Events are the actions of the system on user manipulations (e.g. mouse clicks, key press, timer etc.) or any event triggered by the program.
Delegate is type which holds the method(s) reference in an object. It is also refered as a type safe function pointers.

Answer 4

User406085191 posted

Hi delegates and events with example

http://www.codersource.net/csharp_delegates_events.html

http://www.codeproject.com/KB/cs/delegates-part1.aspx 

http://msdn.microsoft.com/en-us/library/aa288459(VS.71).aspx

Answer 5

User2115139740 posted

this link might help you 

http://www.vikramlakhotia.com/Difference_between_delegate_and_event.aspx

Answer 6

User-379429695 posted

For a dummy explination, as I would be one who requires such an answer:

(this is more "in concept" that exact code syntax, but I will do my best with the syntax as well)

a delegate is a reference to a method.  in other words, you could have a function, but instead of having to call the function by its name every time you want to use it, you could assign that function to an object, or... a variable.

Delegate Function MyDelegate(ByVal p As Integer, ByVal q As Integer) As Integer
    
Public Sub TestSomething()
        Dim arithMethod As New MyDelegate(AddressOf Add)
        Dim res As Integer = arithMethod(3, 4)
        Console.WriteLine("The result of your operation is: " & res)
End Sub
    
Function Add(ByVal a As Integer, ByVal b As Integer) As Integer
        Return a + b
End Function

 

An event on the other hand, is something that your program (or possibly even the .net platform) does, or can do.. that you have the ability to be notified about.  such as the value of a dropdown list changing, it has an event "selected value changed".

 

hopefully i didnt just make a bigger mess, and this helps clear things up :)