How do I trigger an event handler in VS designer?

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.NET4.5

Hi, I have a C# user control comprising three text boxes and some labels. It is designed to be laid out in either landscape fashion with the three text boxes and their labels laid out horizontally left-right next to each other, or in portrait mode with them above each other vertically. So I have a SizeChanged EventHandler which works well at run time - i.e. you can resize the form containing the user control and if the width is larger than the height it lays out horizontally, otherwise it lays out vertically. This works very well.

Now when I place the user control in VS Studio designer (Community 2015 edition) it does not initially lay out according to its resized dimensions. But if I subsequently resize it in VS designer, it does - obviously the SizeChanged EventHandler is being fired and correctly behaves. If I save that form and re-open it, it does not layout correctly again.

What do I have to do to get it to layout correctly when it is first placed or re-opened in VS designer?

What I have tried:

I have tried adding a call to the SizeChanged EventHandler in the User Control's Load Event handler and also in the host Form's Load Event handler but that doesn't solve the problem.

Posted 10-Jul-16 5:31am

Model Sounds Inc.

Updated 10-Jul-16 7:13am

v2

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[no name] 10-Jul-16 13:51pm

Maybe you have also to adjust the layout in something like "OnCreateControl" or "OnHandleCreated" or whatever fits.

Most probably "protected virtual void InitLayout()"

Richard MacCutchan 10-Jul-16 16:27pm

You need to understand that event handlers do not get actioned in Visual Studio, but only when the compiled application is running.

[no name] 11-Jul-16 3:37am

That is wrong.
c# - Winforms: Why do events fire at design-time? - Stack Overflow[^]

Richard MacCutchan 11-Jul-16 4:58am

Never happened with any of my forms.

[no name] 11-Jul-16 5:38am

That is right. It does not happen for form events, but for your own controls derived from Control or e.g. Panel.

Richard MacCutchan 11-Jul-16 6:01am

Yet another thing I need to try, and learn about. Thanks.

[no name] 11-Jul-16 6:11am

You are welcome. When you give it a try, don't follow the example from the link above. The better praxis from my point of view is to overwrite the respective virtual method, e.g. "protected virtual void OnResize(EventArgs e)" and of course call the base class method there also.

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