Initialization of ComboBox in datagrid, Silverlight 4.0
- by Budda
I have datagrid with list of MyPlayer objects linked to ItemsSource, there are ComboBoxes inside of grid that are linked to a list of inner object, and binding works correctly: when I select one of the item then its value is pushed to data model and appropriately updated in other places, where it is used.
The only problem: initial selections are not displayed in my ComboBoxes. I don't know why..?
Instance of the ViewModel is assigned to view DataContext. Here is grid with ComboBoxes (grid is binded to the SquadPlayers property of ViewModel):
<data:DataGrid ="True" AutoGenerateColumns="False" ItemsSource="{Binding SquadPlayers}">
<data:DataGrid.Columns>
<data:DataGridTemplateColumn Header="Rig." Width="50">
<data:DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<ComboBox SelectedItem="{Binding Rigid, Mode=TwoWay}"
ItemsSource="{Binding IntLevels, Mode=TwoWay}"/>
</DataTemplate>
</data:DataGridTemplateColumn.CellTemplate>
</data:DataGridTemplateColumn>
</data:DataGrid.Columns>
</data:DataGrid>
Here is ViewModel class ('_model_DataReceivedEvent' method is called asynchronously, when data are received from server):
public class SquadViewModel : ViewModelBase<SquadModel>
{
public SquadViewModel()
{
SquadPlayers = new ObservableCollection<SquadPlayer>();
}
private void _model_DataReceivedEvent(List<SostavPlayerData> allReadyPlayers)
{
TeamTask task = new TeamTask { Rigid = 1 };
foreach (SostavPlayerData spd in allReadyPlayers)
{
SquadPlayer sp = new SquadPlayer(spd, task);
SquadPlayers.Add(sp);
}
RaisePropertyChanged("SquadPlayers");
}
And here is SquadPlayer class (it's objects are binded to the grid rows):
public class SquadPlayer : INotifyPropertyChanged
{
public SquadPlayer(SostavPlayerData spd)
{
_spd = spd;
Rigid = 2;
}
public event PropertyChangedEventHandler PropertyChanged;
private int _rigid;
public int Rigid
{
get { return _rigid; }
set
{
_rigid = value;
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs("Rigid"));
}
}
}
private readonly ObservableCollection<int> _statIntLevels = new ObservableCollection<int> { 1, 2, 3, 4, 5 };
public ObservableCollection<int> IntLevels { get { return _statIntLevels; } }
It is expected to have all "Rigid" comboboxes set to "2" value, but they are not selected (items are in the drop-down list, and if any value is selected it is going to ViewModel).
What is wrong with this example? Any help will be welcome.
Thanks.
