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POHow to bind DataGridColumn.Visibility?
 

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  1. POHow to bind DataGridColumn.Visibility?
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    <p>I have an issue similar to the following post:</p> <p><a href="https://stackoverflow.com/questions/983272/silverlight-datagridtextcolumn-binding-visibility">Silverlight DataGridTextColumn Binding Visibility</a></p> <p>I need to have a Column within a Silverlight DataGrid be visibile/collapsed based on a value within a ViewModel. To accomplish this I am attempting to Bind the Visibility property to a ViewModel. However I soon discovered that the Visibility property is not a DependencyProperty, therefore it cannot be bound.</p> <p>To solve this, I attempted to subclass my own DataGridTextColumn. With this new class, I have created a DependencyProperty, which ultimately pushes the changes to the DataGridTextColumn.Visibility property. This works well, if I don't databind. The moment I databind to my new property, it fails, with a AG_E_PARSER_BAD_PROPERTY_VALUE exception.</p> <pre><code>public class MyDataGridTextColumn : DataGridTextColumn { #region public Visibility MyVisibility public static readonly DependencyProperty MyVisibilityProperty = DependencyProperty.Register("MyVisibility", typeof(Visibility), typeof(MyDataGridTextColumn), new PropertyMetadata(Visibility.Visible, OnMyVisibilityPropertyChanged)); private static void OnMyVisibilityPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { var @this = d as MyDataGridTextColumn; if (@this != null) { @this.OnMyVisibilityChanged((Visibility)e.OldValue, (Visibility)e.NewValue); } } private void OnMyVisibilityChanged(Visibility oldValue, Visibility newValue) { Visibility = newValue; } public Visibility MyVisibility { get { return (Visibility)GetValue(MyVisibilityProperty); } set { SetValue(MyVisibilityProperty, value); } } #endregion public Visibility MyVisibility } </code></pre> <p>Here is a small snippet of the XAML.</p> <pre><code>&lt;DataGrid ....&gt; &lt;DataGrid.Columns&gt; &lt;MyDataGridTextColumn Header="User Name" Foreground="#FFFFFFFF" Binding="{Binding User.UserName}" MinWidth="150" CanUserSort="True" CanUserResize="False" CanUserReorder="True" MyVisibility="{Binding Converter={StaticResource BoolToVisibilityConverter}, Path=ShouldShowUser}"/&gt; &lt;DataGridTextColumn .../&gt; &lt;/DataGrid.Columns&gt; &lt;/DataGrid&gt; </code></pre> <p><strong>A couple important facts.</strong> </p> <ul> <li>The Converter is indeed defined above in the local resources.</li> <li>The Converter is correct, it is used many other places in the solution.</li> <li>If I replace the {Binding} syntax for the MyVisibility property with "Collapsed" the Column does in fact disappear.</li> <li>If I create a new DependencyProperty (i.e. string Foo), and bind to it I receive the AG_E_PARSER_BAD_PROPERTY_VALUE exception too.</li> </ul> <p>Does anybody have any ideas as to why this isn't working?</p>
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    1. COAny resolution on this? I'm not sure what's going on (the dp looks fine to me...), but if you can't add a new string DependencyProperty and bind to it, that seems like it has got to be the problem.
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      1. USErik Mork
 

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