Viewmodel有一个项目列表，每个项目都有另一个项目列表

Question

I have a datagrid with the following itemsource

ItemsSource="{Binding Path=MyItems, Mode=OneWay}"

Inside each item there is a collection called "MySubItems" and I want to show them in a combobox.. But somehow I can't reach them...

ItemsSource="{Binding MySubItems,Source={StaticResource MyItemsModel}}"

How do I implement this? thank you !

Answer 1

You can use dot notation to access sub properties:

ItemsSource="{Binding Path=MyItems.MySubItems, Mode=OneWay}"

Since you're trying to access properties on a sub object, however, I think the easiest way is to bind the grid to a selected value property and then have the combo box bound to that:

<ComboBox ItemsSource="{Binding SelectedItem.SubItems}"
          SelectedItem="{Binding SelectedComboItem}"
          IsSynchronizedWithCurrentItem="True"/>

DataGrid binding:

<DataGrid ItemsSource="{Binding Path=MyItems, Mode=OneWay}"
          SelectedItem="{Binding SelectedItem, Mode=TwoWay}">