Binding to a relativesource in the code behind

Question

In my UserControl, I have the following code in my XAML

<TextBlock Grid.Row="2" Text="{Binding Path=StartTime, RelativeSource={RelativeSource Mode=FindAncestor, AncestorLevel=1, AncestorType=Window}}" />

This simply gets the value of a property from the parent window and it works great.

How can I do this in the code behind?

Binding b = new Binding(); b.RelativeSource = new RelativeSource(RelativeSourceMode.FindAncestor, typeof(Window), 1); b.Path = "StartTime"; myProperty = b.value;// obviously there is no b.value but this // is what I'm trying to achieve. //BindingOperations.SetBinding(StartTime, StartTimeProperty, b); //This does not work sadly, it can't convert string to DependancyObject

Rohit Vats · Accepted Answer · 2013-11-05 17:09:05Z

Give x:Name to your TextBlock -

then you can do that in code behind like this -

Binding b = new Binding("StartTime"); b.RelativeSource = new RelativeSource(RelativeSourceMode.FindAncestor, typeof(Window), 1); textBlock.SetBinding(TextBlock.TextProperty, b);

gehho · Accepted Answer · 2013-11-05 16:31:47Z

11

You should try BindingOperations.SetBinding. This should work something like this:

BindingOperations.SetBinding(this, myProperty, b);

(assuming that this is a DependencyObject and myProperty is the DependencyProperty.

edited Nov 5, 2013 at 16:31

answered Nov 5, 2013 at 16:19

gehho

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3 Comments

Dave Over a year ago

I had tried this, but I didn't' use this I used the property instead.

gehho Over a year ago

It would be helpful if you posted the code which contains the declaration of myProperty. In my example, this must be a DependencyObject (e.g. a Control), and myProperty must be a DependencyProperty. I assume this is not the case. You might have to change myProperty to something like MyClass.MyProperty (the static DependencyProperty field.

Dave Over a year ago

Sorry, my message wasn't meant to say your example is wrong, more that I was doing it wrong! Your example is what I wanted. Thanks

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