ComboBox ItemsSource has a different datacontext from SelectedItem

Question

I have ComboBox where I get my ItemsSource from my "Settings" object with the UserTypes ObservableCollection inside, and I need to bind its SelectedItem to my "Employee" object's type property. There are other fields within the window, which binds properly to other properties in the "Employee" object, the ItemsSource is correctly populated with the UserTypes property within Settings, and the only thing that is not working is the type property not binding with the combobo'x selecteditem, possibly because it's datacontext is set to the "Settings" object. Here is what I have so far:

<CollectionViewSource x:Key="settingsViewSource" d:DesignSource="{d:DesignInstance my:Settings, CreateList=True}" />
<CollectionViewSource x:Key="settingsUserTypesViewSource" Source="{Binding Path=UserTypes, Source={StaticResource settingsViewSource}}" />

<ComboBox DataContext="{StaticResource settingsUserTypesViewSource}" Name="userTypeBox" VerticalAlignment="Top" Width="100" Margin="2" ItemsSource="{Binding}"
SelectedItem="{Binding Path=Type, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}">

In the code behind, I have:

        InitializeComponent();
        this.emp = emp;
        InfoTab.DataContext = emp;
        userTypeBox.DataContext = MainWindow.ViewSettings.UserTypes;

emp is a specific employee bound to the fields correctly, only the combo boxes' selecteditem is not working. Any help would be greatly appreciated.

Just a thought...¿Do your objects have a "Type" property? Try changing that name, as already exists a "System.Type". — NestorArturo
pls post your corresponding ViewModel code where the bounded properties reside ... — marc wellman

LadderLogic LadderLogic · Accepted Answer · 2012-07-18T21:23:29

I don't know if you have a typo in the actual code or if it's just here, but you are missing a bracket

SelectedItem="Binding Path=Type, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"

should be

SelectedItem="{Binding Path=Type, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"

ComboBox ItemsSource has a different datacontext from SelectedItem

1 Answers