Question

I want to add a DataBinding per Codebehind for an attached Property and want to show the Canvas.Left property in a TextBox. How do I add this property?

Answer 1

It’s somewhat unclear from your question, but I think you’re asking how one would bind to the attached property Canvas.Left and show it in a TextBox. I’ll assume you want it for a control other than the TextBox.

<Canvas>    <TextBox x:Name='textBox' Text='{Binding ElementName=button, Path=(Canvas.Left)}' />    <Button x:Name='button' Content='Press me' /> </Canvas> 

Note the brackets around the attached property.

EDIT: To do the equivalent in code, use the following:

Binding binding = new Binding(); binding.Source = button; binding.Path = new PropertyPath(Canvas.LeftProperty); textBox.SetBinding(TextBlock.TextProperty, binding);