Usercontrol & winform interaction

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I have a winform (vb.net) with a usercontrol (Elememthost) & I need to run the Public sub on the form (With values). After looking for what seem to be forever I am confused as some say you should not do this (Bad structure) & some say it is possible but I have tried everthing without getting anywhere. I this something I should not be doing or there a correct way.

I am new wpf & am sinking fast.

Sorry

What I have tried:

Window.GetWindow(Me)

Posted 25-Nov-19 8:49am

Knight school

Updated 25-Nov-19 10:08am

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RickZeeland · Answer 1 · 2019-11-25T09:08:00

Solution 1

In general you should not mix Winforms with WPF unless you have no other options.
If you must, here's an article about it: Mixing WPF and WinForms - Simple Talk[^]

And here is a walkthrough: Walkthrough: Hosting a WPF Composite Control in Windows Forms | Microsoft Docs[^]
It's in C#, but you can convert it to VB.NET with this online converter: Convert VB.NET to/from C# online - Roslyn Code Converter[^]

Posted 25-Nov-19 9:08am

RickZeeland

Updated 25-Nov-19 9:46am

v2

Comments

Knight school 25-Nov-19 15:24pm

Thanks,
I have no option as my self trained skills are based around Vb.net & I need the 3d capabilities of WPF (steep learning curve & which means c# which I have learnt over time to convert but not write). As for the article I had come across this on my travels but it did not seem to point to a solution or am I misunderstanding it?

Dave Kreskowiak · Answer 2 · 2019-11-25T10:08:00

Solution 2

UserControls should NEVER call a method on the form that hosts it. Doing that permanently binds the control to only ever being used on that one form and that one form only.

That pretty much defeats the purpose of creating a control - re-usability.

What you should be doing is creating an event in the control that the form can subscribe to. It'll be up to the form to decide what to do with the event, including calling whatever code the form decides needs to be called.

Posted 25-Nov-19 10:08am

Dave Kreskowiak

Comments

Knight school 26-Nov-19 15:01pm

Thanks.
That's a much clearer explanation of what I have been trying to understand from many days searching. The only question is how (possible some code as a pointer)?

Many Thanks

Dave Kreskowiak 26-Nov-19 16:02pm

Google: wpf usercontrol custom event[^]

Knight school 28-Nov-19 15:16pm

Sorry for the delay in getting back (I have been away). Thanks for link when I am back I will look into it. Have you got a working snippet you would be able pass on (It may save me time & help me understand it better (WPF is a steep learning curve from Winform))?
Thanks

Dave Kreskowiak 28-Nov-19 15:44pm

No, I don't.

Knight school 3-Dec-19 15:32pm

This must be beyond my understanding.

The Usercontrol needs to crete a RoutedEventArgs
So:-
Public Event CustomClick As RoutedEventHandler

With
RaiseEvent CustomClick(Me, New RoutedEventArgs())' to raise the event

And the the main form require Event to receive the event
main Form:-
Private Sub OnCustomButtonClick(ByVal sender As Object, ByVal e As Windows.RoutedEventArgs)
MsgBox("Got It")
End Sub

But nothing. Any pointers?

Dave Kreskowiak 3-Dec-19 22:32pm

Yeah, scrap what you have because it's all wrong.

Here's an example that shows how to do it: https://docs.microsoft.com/en-us/dotnet/framework/wpf/advanced/walkthrough-hosting-a-wpf-composite-control-in-windows-forms