WPF Datagrid Master Detail MVVM

Question

I have an WPF application. I have two datagrids, one contains a list of indicators and another datagrid that I want to show further details of the selected indicator of the top datagrid.

However my detail grid does not show any data and I can't work out why. I should point out that the master datagrid is populating fine. I have put a break in the setter of the property IndicatorSelected and can see it is being called when an item is selected & the see the data is correct but is just not being displayed in the detail datagrid.

XAML

<DataGrid x:Name="dgModels" Grid.Column="0" 
                      ItemsSource="{Binding Path=IndicatorList}"
                      SelectedItem="{Binding Path=IndicatorSelected}"
                      AutoGenerateColumns="false">
    <DataGrid.Columns>
        <DataGridTextColumn Header="Model" Binding="{Binding Name}" IsReadOnly="True"/>
        <DataGridCheckBoxColumn Header="Run" Binding="{Binding Run}" IsReadOnly="false"/>
    </DataGrid.Columns>                                            
</DataGrid>

<DataGrid x:Name="dgParameterInfo" Grid.Column="1"
          ItemsSource="{Binding Path=IndicatorSelected}"
          AutoGenerateColumns="false">
    <DataGrid.Columns>
        <DataGridTextColumn Header="Parameter Name" Binding="{Binding Path=Name}" IsReadOnly="True"/>
        <DataGridTextColumn Header="Default Value" Binding="{Binding Path=DefaultValue}" IsReadOnly="True"/>
        <DataGridTextColumn Header="Run Value" Binding="{Binding Path=RunValue}" IsReadOnly="True"/>
        <DataGridTextColumn Header="Parameter Type" Binding="{Binding Path=ParaType}" IsReadOnly="True"/>
    </DataGrid.Columns>                    
</DataGrid>

C#

class ViewModel : INotifyPropertyChanged
{
    List<IndicatorWrapper> _indicatorList;
    IndicatorWrapper _indicatorWrapper; 

    public List<IndicatorWrapper> IndicatorList
    {
        get { return _indicatorList; }
        set 
        { 
            _indicatorList = value;
            OnPropertyChanged("IndicatorList");
        }
    }
    public IndicatorWrapper IndicatorSelected
    {
        get { return _indicatorWrapper; }
        set
        {
            _indicatorWrapper = value;
            OnPropertyChanged("IndicatorWrapper");
        }
    }

    public ViewModel()
    {
        DatabaseRetrieveSimulator db = new DatabaseRetrieveSimulator();
        IndicatorList = db.GetIndicators();
    }
}

Mark Feldman Mark Feldman · Accepted Answer · 2013-12-04T23:12:21

In your IndicatorSelected setter you're calling OnPropertyChanged with IndicatorWrapper...it should be IndicatorSelected :)

WPF Datagrid Master Detail MVVM

1 Answers