C validating canceleventargs


24-Jul-2019 11:32

Cancel property to subsequently know if further processing (e.g., actually close the form) is to be aborted? The upshot here is that I'm looking into providing a cancellable events - and I was wondering how I might make use of Cancel Event Args. My plan is to derive a new "event args" class from Cancel Event Args, and let the client set the . Cancel = true, How does the form subsequently know to NOT close the form?Cancel property - just like we can set that property for the Form Closing event. In consideration of the brief sample code at the following link... More generally, after an event is raised, does the event raising class somehow retain a reference to the Cancel Event Args instance, and then check the value of the . Note that there's no magic to "somehow retaining a reference".In my windows form projects , i have validated the fields using Boolean method.

The event handler receives an argument of type System. Cancel Event Args containing data related to this event.Private Sub Other Initialize() ' Exchange commented line and note the difference. Data Saved = True ' Data Saved = False End Sub ' Other Initialize Private Sub Form1_Closing(sender As Object, e As _ System. That means the user cannot close the form unless the field passes validation.

Note also that the user can leave a field if it doesn’t have a This entry was posted in controls and tagged C#, C# programming, controls, example, example program, validate field, validate form, Validating event, Windows Forms programming. The upshot here is that I'm looking into providing a cancellable events -and I was wondering how I might make use of Cancel Event Args. Myplan is to derive a new "event args" class from Cancel Event Args, and letthe client set the .



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