How to make Width to Auto in a binding?

Question

Hello all,

I have a UserControl and binds its Width property to a property of my own model class. The XMAL I'm using is :

<UserControl Width={Binding ModelWidth, Mode=TwoWay}/>

The ModelWidth is a normal CLR property where its type is double.
Normally it works fine.

However, now I want to make the width of the UserControl to "auto" if the value of ModelWidth is double.NaN.

I know there is a way to make a usercontrol to "auto" by C# code:

usercontrol.ClearValue(FrameworkElement.WidthProperty);

The best way I think is to use pure XAML + Converters. How can I achieve this?

Best regards,
Zach

Answer 1

Auto is Double.NaN. So, if you bind the Width to ModelWidth (which is double.NaN), the width should be set to Auto.

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Geert van Horrik - CatenaLogic
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Answer 2

Many Thanks!

Best regards