WPF bindings in window and user control

Question

I have Control Library and WPF application. I need to create my custom control to vizualize graph. So I made GraphControl and set there custom attribute GraphData:

public static readonly DependencyProperty GraphDataProperty = DependencyProperty.Register("GraphData", typeof(Graph), typeof(GraphControl)); public Graph GraphData { get { return (Graph)GetValue(GraphDataProperty); } set { SetValue(GraphDataProperty, value); TextBlock.Text = "asdfasdfasdfasdfasd"; } }

This part is done, but now I want to bind GraphData to property in MainWindow of application where GraphControl is nested. I mean I want to change some graphData property in MainWindow and when I do that, graph rerenders, and all rendering occurs inside control, not window. Ex:

<controls:GraphControl x:Name="GraphControl" GraphData="{Binding GraphData}"/>

If I create new DependencyProperty in Window, then all changes are handled in window, not control.

Leonardo Spina · Accepted Answer · 2015-12-07 17:21:21Z

1

As far as I can understand, you want to bind a property of your control to a property on the window rather than on the DataContext. If this is the case, you can achieve it using the RelativeSource attibute, like this:

<controls:GraphControl x:Name="GraphControl" GraphData="{Binding Path=GraphData, RelativeSource={RelativeSource AncestorType={x:Type Window}}}"/>

answered Dec 7, 2015 at 17:21

Leonardo Spina

6806 silver badges15 bronze badges

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

4 Comments

Vadim Martynov Over a year ago

+ there is no reason to create DependencyProperty in MainWindow class, you should just implement INotifyPropertychanged to bind data to your control.

Ilya Livshits Over a year ago

@VadimMartynov You see, even with your code when I define new DependencyProperty in Window it becomes new instance and does not affect UserControl. I mean for example I change text inside Control by code in setter in Control code-behind, I put breakpoint there. When my form appears I reach this bp, but not when I set property in Window

adminSoftDK Over a year ago

Just to add to Leo's answer you need Mode=TwoWay, to actually make it work. But if you are going to use the same property twice, then don't create it twice, have an attach property instead.

Leonardo Spina Over a year ago

Well yes actually "Mode=TwoWay" could be the default, depending on the property you're binding.

Collectives™ on Stack Overflow

WPF bindings in window and user control

1 Answer 1

4 Comments

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

4 Comments

Related