I have a DataGrid which has a DataGridTemplateColumn that uses the ItemsSource binding of the DataGrid, but in the ComboBox of the DataGridTemplateColumn, I want to be able to bind to the ViewModel for the View instead of the ItemsSource.
<DataGrid ItemsSource="{Binding ModelValues, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" >
<DataGridTemplateColumn Header="myHeader" Width="200">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<ComboBox DisplayMemberPath="Value" SelectedValuePath="Key" IsEnabled="False"
SelectedValue="{Binding myID, Mode=TwoWay}"
ItemsSource="{Binding Path=myList,
RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type local:ViewModel}}}" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
<DataGridTemplateColumn.CellEditingTemplate>
<DataTemplate>
<ComboBox DisplayMemberPath="Value" SelectedValuePath="Key" IsEnabled="False"
SelectedValue="{Binding myID, Mode=TwoWay}"
ItemsSource="{Binding Path=myList,
RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type local:ViewModel}}}" />
</DataTemplate>
</DataGridTemplateColumn.CellEditingTemplate>
</DataGridTemplateColumn>
</DataGrid>
The ViewModel has a ModelValues
property as well as myList
property. The ModelValues
is used for the ItemsSource
of the DataGrid
and I want to use myList
for the ComboBox
ItemsSource
.
How would I change my RelativeSource
command so that it would work?
Bind to the datacontext of the grid :
<DataGrid ItemsSource="{Binding ModelValues, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" >
<DataGridTemplateColumn Header="myHeader" Width="200">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<ComboBox DisplayMemberPath="Value" SelectedValuePath="Key" IsEnabled="False"
SelectedValue="{Binding myID, Mode=TwoWay}"
ItemsSource="{Binding Path=DataContext.myList,
RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGrid}}}" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
<DataGridTemplateColumn.CellEditingTemplate>
<DataTemplate>
<ComboBox DisplayMemberPath="Value" SelectedValuePath="Key" IsEnabled="False"
SelectedValue="{Binding myID, Mode=TwoWay}"
ItemsSource="{Binding Path=DataContext.myList,
RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGrid}}}" />
</DataTemplate>
</DataGridTemplateColumn.CellEditingTemplate>
</DataGridTemplateColumn>
</DataGrid>