FeatureDataGrid binding errors

KirkKuykendall — Fri, 21 Oct 2011 21:32:16 GMT

With SDK version 2.2, I have a View with a tabcontrol where its itemssource is bound to an ObserveableCollection of GraphicsLayers on a ViewModel.

<TabControl ItemsSource="{Binding Layers}" Grid.Row="3" Grid.ColumnSpan="3">
    <TabControl.ItemTemplate>
        <DataTemplate>
            <TabItem >
                <TabItem.Header>
                    <StackPanel Orientation="Horizontal">
                        <TextBlock Text="{Binding ID}"></TextBlock>
                        <Button Content="x" Margin="3" Command="{Binding ElementName=LayoutRoot,Path=DataContext.Delete}" CommandParameter="{Binding}"></Button>
                    </StackPanel>
                </TabItem.Header>
            </TabItem>
        </DataTemplate>
    </TabControl.ItemTemplate>
    <TabControl.ContentTemplate>
        <DataTemplate>
            <Grid>
                <toolkit:FeatureDataGrid Map="{Binding ElementName=LayoutRoot, Path=DataContext.Map}" GraphicsLayer="{Binding}"></toolkit:FeatureDataGrid>
            </Grid>
        </DataTemplate>
    </TabControl.ContentTemplate>
</TabControl>

Here's the ViewModel:

public ObservableCollection<GraphicsLayer> Layers
{
    get { return m_Layers; }
    set
    {
        m_Layers = value;
        RaisePropertyChange("Layers");
    }
}

The first time I add a graphicslayer to the viewmodel, it works fine. But I do see these errors:

System.Windows.Data Error: 1 : Cannot create default converter to perform 'one-way' conversions between types 'System.Windows.Controls.DataGridHeadersVisibility' and 'System.Windows.Visibility'. Consider using Converter property of Binding. BindingExpression:Path=HeadersVisibility; DataItem='FeatureDataGrid' (Name=''); target element is 'Button' (Name=''); target property is 'Visibility' (type 'Visibility')
System.Windows.Data Error: 5 : Value produced by BindingExpression is not valid for target property.; Value='Column' BindingExpression:Path=HeadersVisibility; DataItem='FeatureDataGrid' (Name=''); target element is 'Button' (Name=''); target property is 'Visibility' (type 'Visibility')
System.Windows.Data Error: 1 : Cannot create default converter to perform 'one-way' conversions between types 'System.Windows.Controls.DataGridHeadersVisibility' and 'System.Windows.Visibility'. Consider using Converter property of Binding. BindingExpression:Path=HeadersVisibility; DataItem='FeatureDataGrid' (Name=''); target element is 'DataGridColumnHeadersPresenter' (Name='PART_ColumnHeadersPresenter'); target property is 'Visibility' (type 'Visibility')
System.Windows.Data Error: 5 : Value produced by BindingExpression is not valid for target property.; Value='Column' BindingExpression:Path=HeadersVisibility; DataItem='FeatureDataGrid' (Name=''); target element is 'DataGridColumnHeadersPresenter' (Name='PART_ColumnHeadersPresenter'); target property is 'Visibility' (type 'Visibility')

After I clear the collection then add a layer to the collection, I get a tab item, but no FeatureDataGrid. When I have multiple tabs showing (with featuredatagrids) and switch between them I get a unhandled exception crash.

Is this a bug, or am I doing something wrong?

Thanks!

Re: FeatureDataGrid binding errors

JenniferNery — Sun, 23 Oct 2011 20:48:34 GMT

The binding errors could be with the TabControl as I have tried binding to from ComboBox.SelectedItem to FeatureDataGrid before and it worked fine. I do see cast exception with TabControl though.

You can look at this Silverlight forum post: http://forums.silverlight.net/p/18256/165714.aspx

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FeatureDataGrid binding errors

Re: FeatureDataGrid binding errors