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POBinding in a WPF data grid text column
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copied!<p>I'm trying to build a data grid where one of the columns is a font name displayed in that font. Previously, I was working with a list box where I had defined the following template:</p> <pre><code><TextBlock Text="{Binding Path=Name}" FontFamily="{Binding Path=Name}"/> </code></pre> <p>This worked just fine. So, I tweaked the data structure (Name became Font.Name) and moved onto a data grid to try this:</p> <pre><code><dg:DataGridTextColumn Binding="{Binding Font.Name}" FontFamily="{Binding Font.Name}" IsReadOnly="True" Header="Font"/> </code></pre> <p>Now the font names are all displayed in the default font, and I get this error:</p> <pre><code>System.Windows.Data Error: 2 : Cannot find governing FrameworkElement or FrameworkContentElement for target element. BindingExpression:Path=Font.Name; DataItem=null; target element is 'DataGridTextColumn' (HashCode=56915998); target property is 'FontFamily' (type 'FontFamily') </code></pre> <p>A few Google results dealing with custom controls suggest changing the property from DependencyObject to FrameworkElement, but I'd have to inherit DataGridTextColumn and define my own property to do so - there must be a better way.</p> <p>I've tried several different approaches to the binding, including attempting to change just the font size with a distinct property in my data class (i.e., <code>FontSize="{Binding FontSize}"</code>). They've all resulted in the same error as above.</p> <p>Anyone know what I'm doing wrong here?</p> <p><strong>Edit:</strong></p> <p>Thanks to Jared's reply, I found the following:</p> <p><a href="http://blogs.msdn.com/jaimer/archive/2008/11/22/forwarding-the-datagrid-s-datacontext-to-its-columns.aspx" rel="noreferrer">http://blogs.msdn.com/jaimer/archive/2008/11/22/forwarding-the-datagrid-s-datacontext-to-its-columns.aspx</a></p> <p>The method looks sound, but I need to make a binding that references the correct element in the DataContext for each row, as opposed to sharing a single value for the entire column.</p> <p>Code behind:</p> <pre><code>fontDataGrid.DataContext = from font in new InstalledFontCollection().Families; </code></pre> <p>XAML:</p> <pre><code>Binding="{Binding Font.Name}" FontFamily="{Binding (FrameworkElement.DataContext).Font.Name, RelativeSource={x:Static RelativeSource.Self}}" </code></pre> <p>Using the above XAML clearly isn't correct, because DataContext is the entire collection of fonts. But I can't index the collection, since I don't know what the row number is (or do I?). Is there some approach I can use to achieve this?</p> <p>And a secondary question - why does the Binding attribute seem to work just fine, even without the DataContext? Is it looking at ItemsSource instead?</p>

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