Having trouble binding list/grid to collection

Question

I have set up a grid and bound it to a collection. I can edit the items in the collection through my grid and the changes get propagated to the collection. And, the GUI is showing everything in the collection at the time the ItemSource is set. But, I am programmatically changing some of the items in the collection (after the ItemSource is set) and these changes aren't reflected in the grid/GUI. Is there something else I need to do in order to get it to refresh. FYI, for the fields I want to edit (MoveToResource, ResourceKey, and Resource Type), I have set the mode to TwoWay. Below is my grid.

            <ListView Name="lstXAMLStrings" Margin="5"  Grid.Row="1">
            <ListView.View>                    
                <GridView>
                    <GridView.Columns>
                        <GridViewColumn Header="Extract?">
                            <GridViewColumn.CellTemplate>
                                <DataTemplate>
                                    <CheckBox Content="" IsChecked="{Binding Path=MoveToResource, Mode=TwoWay}"  ></CheckBox>
                                </DataTemplate>
                            </GridViewColumn.CellTemplate>
                        </GridViewColumn>
                        <GridViewColumn Header="Text">
                            <GridViewColumn.CellTemplate>
                                <DataTemplate>
                                    <local:RichTextBlock RichText="{Binding Path=FormattedMatchedLines}"  TextWrapping="Wrap"  Width="650"></local:RichTextBlock>
                                </DataTemplate>
                            </GridViewColumn.CellTemplate>
                        </GridViewColumn>
                        <GridViewColumn Header="Key Name">
                            <GridViewColumn.CellTemplate>
                                <DataTemplate>
                                    <TextBox Text="{Binding Path=ResourceKey, Mode=TwoWay}" Width="150"></TextBox>
                                </DataTemplate>
                            </GridViewColumn.CellTemplate>
                        </GridViewColumn>
                        <GridViewColumn Header="Resource Type">
                            <GridViewColumn.CellTemplate>
                                <DataTemplate>
                                    <ComboBox ItemsSource="{Binding Source={StaticResource odp}}" SelectedItem="{Binding Path=Resource, Mode=TwoWay}"></ComboBox>
                                </DataTemplate>
                            </GridViewColumn.CellTemplate>
                        </GridViewColumn>
                    </GridView.Columns>
                </GridView>                   
            </ListView.View>
        </ListView>

Answer 1

Does your [view]model class implement INotifyPropertyChanged and fire the event whenever the property set accessor is used?

Answer 2

You need to make sure that your collection items implement INotifyPropertyChanged.

If each item you're changing programatically (correctly) implements that, your ListView/GridView will stay current.

This will work if you modify your collection items programatically, or in another screen.

Answer 3

You need to make sure that the collection itself that you're databinding to is an observable collection (a class that implements the INotifyCollectionChanged interface). You might be able to alternatively roll your own class that implements INotifyCollectionChanged, but that's the only reason ObservableCollection exists so it could save you some time.

There's an msdn article on how to do it.