CODEWITHSUNDEEP
wpfbindingdatacontext
Zerox
Zerox

Reputation: 13

WPF binding child controls DataContext to HierarchicalDataTemplate ItemsSource item

I have a collection of Barcodes that contains a collection of Positions. How do I set the DataContext of a custom control to a Position item in the collection?

    <TreeView ItemsSource="{Binding SelectedPlate.Barcodes}">
        <TreeView.ItemTemplate>
            <HierarchicalDataTemplate ItemsSource="{Binding Positions}"
                                  DataType="{x:Type ControlViewModels:BarcodeViewModel}">

                <TextBox Text="{Binding Code}"/>

                <HierarchicalDataTemplate.ItemTemplate>
                    <DataTemplate>

                        <!--The Custom Control that needs to bind to the Position item-->
                        <ControlViews:PositionControl DataContext="{Binding}"/>
                        
                    </DataTemplate>
                </HierarchicalDataTemplate.ItemTemplate>
            </HierarchicalDataTemplate>
        </TreeView.ItemTemplate>

    </TreeView>

Upvotes: 1

Views: 138

Answers (1)

mm8
mm8

Reputation: 169200

The root element in the ItemTemplate inherits the DataContext so you can remove DataContext="{Binding}".

<TreeView ItemsSource="{Binding SelectedPlate.Barcodes}">
    <TreeView.ItemTemplate>
        <HierarchicalDataTemplate ItemsSource="{Binding Positions}"
                                  DataType="{x:Type ControlViewModels:BarcodeViewModel}">
            <TextBox Text="{Binding Code}"/>
            <HierarchicalDataTemplate.ItemTemplate>
                <DataTemplate>
                    <ControlViews:PositionControl />
                </DataTemplate>
            </HierarchicalDataTemplate.ItemTemplate>
        </HierarchicalDataTemplate>
    </TreeView.ItemTemplate>
</TreeView>

In the PositionControl you can then bind directly to a public property of a Position object assuming you don't explicitly set the DataContext of the control somewhere.

Upvotes: 1

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