Setting MaxWidth at runtime in WPF

Question

This is a .Net 4.5 WPF question. I am trying to set the MaxWidth of a FrameworkElement defined in XAML (specifically, an Expander) programmatically, but I've tried

• myFrameworkElement.MaxWidth = value
• myFrameworkElement.SetValue(MaxWidthProperty,value) -and-
• myFrameworkElement.Dispatcher.Invoke(() => MaxWidth = value);

No joy. When I run it through the debugger, MaxWidth stubbornly remains at the value specified at compile-time in the XAML. Is it even possible to set MaxWidth and MaxHeight at runtime?

Thanks.

Answer 1

Try to set the MaxWidth of your control in double in code. For example, for Textbox names txtTest you can set its maxwidth as below.

txtTest.MaxWidth=300.0;

In case of Expander as well this mechanism works properly. can you show me your xaml how you have defined your expander