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I need to access a WPF usercontrol's designheight and designwidth at runtime. I know this is impossible, so I'll explain why I want to do it, and hopefully someone can provide an example of the right approach.

From a C# winforms app, I open a new window containing a very large WPF usercontrol. If the monitor I'm running on can handle it, I want it to open the window at the full design size of the usercontrol. If the monitor I'm running on can't handle it, then I want to open the window as large as possible, leaving 1 pixel on each side of the screen. So I need to know the usercontrol's current design width and height before the usercontrol is displayed.

I want to avoid hard coding values in the winforms app, or using unbound public properties in the user control, because then I have to trust other developers to update them when they change the user control. I don't know if it's possible to bind a local variable to designheight or designwidth, or how to code that in XAML. Since I don't know a lot of WPF, there may be some other way to reach the goal that I don't know about.

Thanks for your help and advice.

Aging Hippie
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Why don't you try something like Resize WPF Window and contents depening on screen resolution

The answer suggests that you bind the screen size to the window height and width. It will automatically size the window according to screen size. You can even set a % value for the size of the window.

Shivani Katukota
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