Here is the XAML:
<DataGrid Grid.Column="0" AutoGenerateColumns="False" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" ItemsSource="{Binding Path=Columns}"
x:Name="ColumnsGrid" RowHeaderWidth="0">
<DataGrid.Columns>
<DataGridTextColumn Width="*" Binding="{Binding Path=Header}"
Header="{Binding ElementName=ColumnsGrid, Path=DataContext.Count, StringFormat=Columns ({0}), diag:PresentationTraceSources.TraceLevel=High}"/>
</DataGrid.Columns>
</DataGrid>
Binding returns error: System.Windows.Data Error: 2 : Cannot find governing FrameworkElement or FrameworkContentElement for target element.
What do I miss?
Update:
Here is the answer: http://blogs.msdn.com/b/jaimer/archive/2008/11/22/forwarding-the-datagrid-s-datacontext-to-its-columns.aspx
What is happening here? The Columns collection is just a property in the Datagrid; this collection is not in the logical (or visual) tree, therefore the DataContext is not being inherited, which leads to there being nothing to bind to.
Update 2: Good article about DataGrid's caveats: http://blogs.msdn.com/b/vinsibal/archive/2009/04/07/5-random-gotchas-with-the-wpf-datagrid.aspx
Binding on DataGridColumn
for Header
abd Visibility
properties needs special treatment...
See this...
Bind datagrid column visibility MVVM
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