Call a method with parameters

Question

I want to call a method when an animation ends. I'm using this statement:

AddHandler anim.Completed, AddressOf anim_completed

But i want the anim_completed sub to be with parameters. Any ideas how to do that?

Just add parameters to the sub...i don't get it. Also, you're method names need work. Upper camel case. — rory.ap, Aug 22 '16 at 14:32
Why would you think i didn't try that? Anyway if i add parameters to the sub i get this:'Public Sub anim_completed(target As Ellipse)' does not have a signature compatible with delegate 'Delegate Sub EventHandler(sender As Object, e As EventArgs)'. — dreameral, Aug 22 '16 at 14:37
[Completed](https://msdn.microsoft.com/en-us/library/system.windows.media.animation.timeline.completed(v=vs.110).aspx) is an event that takes a handler method with a fixed signature. You can't change that. — Clemens, Aug 22 '16 at 14:37
So i can't call a method with parameters when an event occurs? — dreameral, Aug 22 '16 at 14:38
@Eae --, well, I would think you didn't try that because you didn't say so. Why didn't you include more pertinent information in your question like "if i add parameters to the sub i get this:'Public Sub anim_completed(target As Ellipse)' does not have a signature compatible with delegate 'Delegate Sub EventHandler(sender As Object, e As EventArgs)'"?? — rory.ap, Aug 22 '16 at 14:38

score 1 · Accepted Answer · answered Aug 22 '16 at 15:08

1

Simple solution. Use Anonymous Event Handler, then you will be able to access Ellipse object directly.

Dim target As Ellipse = Nothing

AddHandler anim.Completed, Sub()
                                If target IsNot Nothing Then

                                End If
                            End Sub

answered Aug 22 '16 at 15:08

Anton Kedrov

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`Use Anonymous Event Handler` this is asking for issues when not `Removing` them... There is a thing called `WithEvents` that handles all of this for you, adding and removing handlers... – Trevor Aug 22 '16 at 15:27
Do you need to? :) If you find that you do, then you can find answers here: http://stackoverflow.com/questions/1362204/how-to-remove-a-lambda-event-handler – Anton Kedrov Aug 22 '16 at 15:34

score 0 · Answer 2 · answered Aug 22 '16 at 15:23

0

Your delegate/method need to have the same signature as the event. But inside that event you can call what ever you want.

AddHandler anim.Completed, AddressOf onAnimCompleted

Sub onAnimCompleted(sender As Object, e As EventArgs)

    Dim target As New Ellipse

    anim_completed(target)

End Sub

answered Aug 22 '16 at 15:23

the_lotus

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But i want to pass an existing ellipse – dreameral Aug 22 '16 at 15:27
@Eae Instead of creating a new Ellipse like in my example, you can get an existing ellipse. – the_lotus Aug 22 '16 at 15:34

Call a method with parameters

2 Answers2