I'm working on becoming as familiar with C# as I am with VB.NET (the language used at my workplace). One of the best things about the learning process is that by learning about the other language you tend to learn more about your primary language--little questions like this pop up:
According to the sources I've found, and past experience, a field in VB.NET that is declared as WithEvents is capable of raising events. I understand that C# doesn't have a direct equivalent--but my question is: fields without this keyword in VB.NET cannot raise events, is there a way to create this same behavior in C#? Does the VB compiler simply block these objects from having their events handled (while actually allowing them to raise events as usual)?
I'm just curious; I don't have any particular application for the question...
Omitting WithEvents doesn't block members from raising events. It just stops you from using the 'handles' keyword on their events.
Here is a typical use of WithEvents:
Class C1
Public WithEvents ev As New EventThrower()
Public Sub catcher() Handles ev.event
Debug.print("Event")
End Sub
End Class
Here is a class which doesn't use WithEvents and is approximately equivalent. It demonstrates why WithEvents is quite useful:
Class C2
Private _ev As EventThrower
Public Property ev() As EventThrower
Get
Return _ev
End Get
Set(ByVal value As EventThrower)
If _ev IsNot Nothing Then
removehandler _ev.event, addressof catcher
End If
_ev = value
If _ev IsNot Nothing Then
addhandler _ev.event, addressof catcher
End If
End Set
End Property
Public Sub New()
ev = New EventThrower()
End Sub
Public Sub catcher()
Debug.print("Event")
End Sub
End Class