Raise Events : Event « Event « VB.Net Tutorial

1. VB.Net Tutorial
2. Event
3. Event

Module Module1

    Dim WithEvents ValueInfo As New Value()

    Class Value
        Public Event ValueUp(ByVal Amount As Double)
        Public Event ValueDown(ByVal Amount As Double)
        Public Event Result(ByVal Amount As Double, ByVal AnnounceDate As DateTime)

        Public Sub GenerateEvents()
            RaiseEvent ValueUp(2)
            RaiseEvent ValueDown(-5.5)
            RaiseEvent Result(1.25, Now())
        End Sub
    End Class

    Sub PriceGoingUp(ByVal Price As Double)
        Console.WriteLine("Up: " & Price)
    End Sub

    Sub PriceGoingDown(ByVal Price As Double)
        Console.WriteLine("Down: " & Price)
    End Sub

    Sub ResultAnnouncement(ByVal Amount As Double, ByVal AnnounceDate As DateTime)
        Console.WriteLine("Result: " & Amount & " " & AnnounceDate)
    End Sub


    Sub Main()
        AddHandler ValueInfo.ValueUp, AddressOf PriceGoingUp
        AddHandler ValueInfo.ValueDown, AddressOf PriceGoingDown
        AddHandler ValueInfo.Result, AddressOf ResultAnnouncement

        ValueInfo.GenerateEvents()
    End Sub


End Module

Up: 2
Down: -5.5
Result: 1.25 11/05/2007 9:33:43 PM

11.1.Event
	11.1.1.	Raise Events
	11.1.2.	Multiple Event Handler
	11.1.3.	Event handler
	11.1.4.	Subclass EventArgs to create your own event arguments
	11.1.5.	Inherit Event
	11.1.6.	Custom event handler
	11.1.7.	WithEvents and Event method
	11.1.8.	Add and remove event handler
	11.1.9.	Handle events from more than one components
	11.1.10.	Add, remove event handler to/from ToggleButton
	11.1.11.	Use one method to handle more than one RadioButton click event
	11.1.12.	Get event sender type
	11.1.13.	Instantiating the Action<(Of <(T>)>) delegate rather than explicitly defining a new delegate and assigning a named method