Pass through wpf dependency property of usercontrol to child control

Question

I have a custom MyControl : UserControl with dependency property

string Text

Inside the MyControl in XAML I have a TextBox.

I wish to bind the Text dependency property of MyControl to the Text dependency property of the TextBox.

What is the best way to do this? Can I declare the dependency property of MyControl to pass through to the child depenendency property?

Dan Puzey · Accepted Answer · 2013-01-30 14:29:47Z

5

The easiest way is to assign a x:Name="root" attribute to the root of your MyControl.xaml file, and then use a binding like this for your TextBox:

<TextBox Text="{Binding Text, ElementName=root}" />

(You can specify your own name for root.)

answered Jan 30, 2013 at 14:29

Dan Puzey

34.3k4 gold badges77 silver badges98 bronze badges

Sign up to request clarification or add additional context in comments.

6 Comments

bradgonesurfing Over a year ago

But does that implicitly create the DP on the user control. I would still have to declare it in code behind right?

Dan Puzey Over a year ago

You absolutely have to declare your property on the user control; there's no implicit creation of a property just because you bind to it. Your question states that you have a custom control with that dependency property already and is asking for help binding to it; if that's not the case then you should possibly reword your question.

bradgonesurfing Over a year ago

Nah I was just curious. There are lots of dark corners in WPF. It wouldn't have surprised me if it were possible :)

GetFuzzy Over a year ago

This works, but what about when you want to specify a StringFormat in the binding such as: UnitlessValue="{Binding NumberAsPercent, StringFormat=P1}, has anyone found a way to do this?

Dan Puzey Over a year ago

@GetFuzzy: have you tried {Binding NumberAsPercent, ElementName=root, StringFormat=P1}?

|

Community · Accepted Answer · 2017-05-23 11:46:24Z

My answer here details a nice example of how you can accomplish this. You'll essentially have your controls bound to properties on your view models, with the child view model having a dependency property that enables binding on the child control and can push the value to the child's view model. The example is in Silverlight but the implementation is the same for WPF.

Collectives™ on Stack Overflow

Pass through wpf dependency property of usercontrol to child control

2 Answers 2

6 Comments

Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

6 Comments

Comments

Linked

Related