CODEWITHSUNDEEP
wpfdata-binding
ksman
ksman

Reputation: 41

WPF Data Binding of Width Property

I'm trying to bind the Width property of a Canvas to the Width property of a Shape instance. So the Shape Width should be updated when the Canvas Width gets a new value

I want to do that in code, without XAML, because I create these elements on runtime.

I tried this, but it didnt work (the code is inside of my Canvas):

Binding binding = new Binding();
binding.Mode = BindingMode.OneTime;
binding.Source = this;
binding.Path = new PropertyPath("Width");
shape.SetBinding(FrameworkElement.WidthProperty, binding);

Thanks a lot for your help!

ksman

Upvotes: 0

Views: 1001

Answers (2)

default.kramer
default.kramer

Reputation: 6103

OneTime looks wrong. I think you want to use OneWay or TwoWay. Check the BindingModes

Edit

Since OneWay and ActualWidth didn't fix your problem, I should recommend you use a tool for debugging bindings. I use Snoop because it is free, but there are others. Debugging WPF without a tool like this can be painful.

Upvotes: 2

Joe White
Joe White

Reputation: 97656

You probably want to bind to ActualWidth and not Width.

Width is an input into the layout process -- it's something you may (but don't have to) specify.

ActualWidth is an output of the layout process -- it's the actual width that you see on the screen. This is partly determined by Width, if present, but other factors go into it too (especially if you didn't explicitly set Width in your XAML).

Upvotes: 1

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