Binding to Parent DataTemplate Property from ItemsControl

Question

Say I have this ViewModel and xaml:

class MyViewModel { public MyStringValue {get;set;} = "HelloWorld" public IList<CustomObject> ChildViewModels{get;set;} } <DataTemplate DataType="{x:Type local:MyViewModel}"> <ItemsControl ItemsSource="{Binding ChildViewModels}"> <ItemsControl.ItemTemplate> <DataTemplate> <Grid> <TextBlock Text="{Binding Path=MyStringValue, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type local:MyViewModel}}}"/> </Grid> </DataTemplate> </ItemsControl.ItemTemplate> </ItemsControl> </DataTemplate>

I keep getting this error message: "Cannot find source for binding with reference 'RelativeSource FindAncestor ... " So basically, I'm trying to bind the parents property container of ItemsControl and it seems like I can't.

Does this answer your question? Access parent DataContext from DataTemplate — StayOnTarget
– StayOnTarget, Commented Mar 3, 2021 at 14:03

StayOnTarget · Accepted Answer · 2021-03-03 14:03:05Z

9

RelativeSource AncestorType is something which belongs to a higher level of visual tree (ItemsControl here).

Since MyStringValue is not a property of ItemsControl, you should change Binding Path as well to point to view model (DataContext):

{Binding Path=DataContext.MyStringValue, RelativeSource={RelativeSource AncestorType=ItemsControl}}"

edited Mar 3, 2021 at 14:03

StayOnTarget

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answered Apr 16, 2016 at 18:31

ASh

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2 Comments

Cgt Over a year ago

wow, that's all it took? I am still new to wpf visual tree concept, and I have tried for hours to get it to work. Thanks a lot! Thanks @Ash! Is there any good tutorial on where I can read up on the visual tree level and how binding works?

ASh Over a year ago

@Cgt, take a look here: stackoverflow.com/questions/15982834/… and stackoverflow.com/questions/3456677/…

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