Bind Visability of Template Column to underlying data

Question

I'm trying to figure out how to bind the viability of a DataGrid Template column to the observable collection that is the datacontext for the datagrid. Note: I'm a beginner with this stuff though, so you probably have to explain like you would to a 10yr old...

I know this is is related to this stackoverflow but I still can't seem to get it to go.

I have a breakpoint in the converter but it never gets hit when data is added to the observable collection...

I hope this makes sense... Thanks a lot

                    <DataGrid AutoGenerateColumns="False" AlternatingRowBackground="LightBlue" ItemsSource="{Binding historyColl}" Margin="0,75,6,26" Name="historyDataGrid" FontSize="12" HorizontalAlignment="Right" Width="381">
                    <DataGrid.Columns>
                        <DataGridTemplateColumn Header="Date (dd-mm)" Width="80*">
                            <DataGridTemplateColumn.CellTemplate>
                                <DataTemplate>
                                    <TextBlock Text="{Binding Date}" Background="{Binding Converter={StaticResource TradedBackground}}"/>
                                </DataTemplate>
                            </DataGridTemplateColumn.CellTemplate>
                        </DataGridTemplateColumn>

                        <DataGridTemplateColumn Header="Test" Width="50" Visibility="{Binding RelativeSource={x:Static RelativeSource.Self}, 
                                Path=FrameworkElement.DataContext, Converter={StaticResource booleanToVisiblityConverter}}">
                           <DataGridTemplateColumn.CellTemplate>
                                <DataTemplate>
                                    <TextBlock Text="{Binding Test}"/>
                                </DataTemplate>
                            </DataGridTemplateColumn.CellTemplate>
                        </DataGridTemplateColumn>

                    </DataGrid.Columns>
                </DataGrid>

Didn't you forget to define your `booleanToVisiblityConverter` in resources? Also, I would use just `Visibility="{Binding PathToVisibilityFlagInDataContext, Converter={StaticResource booleanToVisiblityConverter}}"` with appropriate `PathToVisibilityFlagInDataContext`. (You seem to forget this one as well.) — Vlad, Sep 17 '12 at 19:24
I did define the converter, but did it in the window resources though... where do I put this on the C# side though?PathToVisibilityFlagInDataContext — keynesiancross, Sep 17 '12 at 19:29
I was basically hoping the converter would allow me to access the first row of the ObservableCollection, and then from there I could set the visibility.. — keynesiancross, Sep 17 '12 at 19:31
Well, `PathToVisibilityFlagInDataContext` is not needed if your converter is ready to get the whole collection. — Vlad, Sep 17 '12 at 19:42
Are you sure the data context of `DataGridTemplateColumn` is what you expect? I would try `RelativeSource={RelativeSource FindAncestor, AncestorType=DataGrid}`: `DataGrid` should have the data context as you expect. Did you try to check the data context with [snoop](http://snoopwpf.codeplex.com/)? — Vlad, Sep 17 '12 at 19:45
Downloading snoop now, will give that a go. I added the above relative source bit but no dice.. — keynesiancross, Sep 17 '12 at 19:49
so I have snoop going, and have it looking at my datagrid, but I have no idea how to find that column... — keynesiancross, Sep 17 '12 at 19:56
Well, you can see the whole visual tree in snoop, right? You can expand the DataGrid node it and see which are the visual elements available. — Vlad, Sep 18 '12 at 09:56

score 0 · Answer 1 · answered Sep 18 '12 at 12:40

I would join the discussion below the question but I don't have enough points to do so. I am pretty sure that Path=FrameworkElement.DataContext is the problem. The converter expects a boolean, but gets a DataContext instead.

I would expect a property of type bool within the DataContext itself to which you could bind the visibility, using the converter.

Defining the converter in window resources is just fine.

Bind Visability of Template Column to underlying data

1 Answers1