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Obviously, using delegates in place of events might be construed as overkill because events work quite nicely for scenarios where an event model is required.
However, because delegates are function pointers, they also provide other capabilities that you can take advantage of, such as function substitution and asynchronous operation.
This article is excerpted from Chapter 4, "Object-Oriented Features," from Building Distributed Applications with VB. This material is based on the Beta2 release version of Microsoft's . This article assumes that the reader has some experience with VB, the Windows environment, event-based programming, basic HTML, and scripting.
The basic event handling syntax has not changed significantly from previous versions of VB, although it has been extended (as you'll see shortly).
In above scenario both provide same o/p and consuming timing. So can you help me how event help to smooth my code.
events are hierarchical and will cascade up and down the parent chain until the appropriate control is reached.
For all sizing enumerations, values with names that refer to displayed cells limit their calculations to cells in displayed rows.
With these values, you can limit which cells are used to calculate the preferred sizes.
To make this a little clearer, examine the code in Listing 4.4 that shows the Public Class Registration Watch Delegate Sub New Registrations(By Val p Students As Data Set) ' Other methods and properties Private mfound as New Registrations Public Sub Register Client(By Val found As New Registrations) Mfound = found End Sub Public Sub Look() Dim ds Studs As Data Set Dim fl New As Boolean ' Method that fires on a timer to look for new registration ' If one is found then create a Data Set with the new students ' and raise the event fl New = True ds Studs = New Data Set() If fl New Then mfound.
Invoke(ds Studs) 'invoke the delegate End If End Sub End Class Notice also you don't have to explicitly create the add and remove methods, even when specifying the delegate yourself; the VB. The client code also changes in order to instantiate the delegate as it is being passed to the Private mobj Reg As Registration Watch ' in a class or module mobj Reg = New Registration Watch() mobj Reg. New Registrations( _ Address Of New Registrations)) mobj Reg.
As in previous versions, events can be declared within a class using the Public Class Registration Watch Public Event New Registrations(By Val p Students As Data Set) ' Other methods and properties Public Sub Look() Dim ds Studs As Data Set Dim fl New As Boolean ' Method that fires on a timer to look for new registrations ' since the last invocation of the method ' If one is found then create a Data Set with the new students ' and raise the event fl New = True ds Studs = New Data Set() If fl New Then Raise Event New Registrations(ds Studs) End If End Sub End Class keyword to indicate precisely which event the procedure handles rather than simply relying on the naming convention used by the event handler as in previous versions.Tags: Adult Dating, affair dating, sex dating