C# Binding does not work?

Question

I am trying to bing a grid size (i.e. Width and Height) to one of its child (i.e. a Viewbox). I tried this :

Binding bind = new Binding(); bind.Source = this._vb; this._container.SetBinding(Grid.DataContextProperty, bind);

But it did not work as expected so I tried this

Binding bindWidth = new Binding(); bindWidth.Source = this._vb.Width; this._container.SetBinding(Grid.WidthProperty, bindWidth); Binding bindHeight = new Binding(); bindHeight.Source = this._vb.Height; this._container.SetBinding(Grid.HeightProperty, bindHeight);

I wanted to zoom the Viewbox to have its child zoomed as well and update the Grid parent of my Viewbox. I also tried to do the opposite way (zoom the grid binded to my viewbox but it did not work).

Does someone know why it happens ?

It tells me I need Path or XPath to use a bidirectional Binding — baptiste
– baptiste, Commented Jun 13, 2014 at 13:37
Ah ok I tried with with the first solution I implemented. I thought it would be the same >< — baptiste
– baptiste, Commented Jun 13, 2014 at 13:41
It didnt change anything... I will try to find why. Thanks for your fast answers ! — baptiste
– baptiste, Commented Jun 13, 2014 at 13:45

JimBobBennett · Accepted Answer · 2014-06-13 16:05:34Z

Width an Height properties to guide the calculation of Width and Height. Try binding to ActualWidth/ActualHeight instead.

var binding = new Binding("ActualHeight"); binding.Source = this._vb; this._container.SetBinding("Height", binding);

This will update the Height property on the _container to match the ActualHeight of the _vb object.

It works great. I just needed to specify a DependencyProperty into the SetBinding function. The "Height" didn't work and I just replaced it by Grid.HeightProperty. Just for information. Anyway thanks!

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