ItemsControl property of child item does not get parent datacontext
I have a property in my model-view:
public BitmapImage MyImage {get; set;}
I have an ItemsControl whose items have multiple images and some text. One of the images in the itemcontrol elements should be MyImage. However, the ItemsControl has an ItemsSource property that I have set to bind Path = Result and I know that all items in itemcontrol take the result data context.
So now when I do this:
<Image Source="{Binding Path=MyImage}" />
Of course I am getting the error:
BindingExpression path error: 'MyImage' property not found on 'object' ''KeyValuePair`2' (HashCode=-853042223)'. BindingExpression:Path=MyImage; DataItem='KeyValuePair`2' (HashCode=-853042223); target element is 'Image' (Name=''); target property is 'Source' (type 'ImageSource')
System.Windows.Data error: 40:
This is because MyImage is direct and the binding is not looking for direct properties. Instead, it looks in the context of the parent's data.
How can I avoid this?
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use RelativeSource here
<Image Source="{Binding Path=DataContext.MyImage, RelativeSource={RelativeSource FindAncestor,AncestorType=ItemsControl}}" />
this way you can access parent DataContext in element template etc.
EDIT
I just thought of another possible binding problem, it looks like you are binding a dictionary of elements
If the image path is in one of the keys or values then maybe this is the solution
<Image Source="{Binding Path=Key.MyImage}" />
or
<Image Source="{Binding Path=Value.MyImage}" />
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