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POUsing bindings to control column order in a DataGrid
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  1. POUsing bindings to control column order in a DataGrid
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    copied!<p><strong>Problem</strong></p> <p>I have a WPF Toolkit <code>DataGrid</code>, and I'd like to be able to switch among several preset column orders. This is an MVVM project, so the column orders are stored in a <code>ViewModel</code>. The problem is, I can't get bindings to work for the <code>DisplayIndex</code> property. No matter what I try, including the sweet method in <a href="http://blogs.infragistics.com/blogs/josh_smith/archive/2008/06/26/data-binding-the-isvisible-property-of-contextualtabgroup.aspx" rel="noreferrer">this Josh Smith tutorial</a>, I get:</p> <blockquote> <p>The DisplayIndex for the DataGridColumn with Header 'ID' is out of range. DisplayIndex must be greater than or equal to 0 and less than Columns.Count. Parameter name: displayIndex. Actual value was -1.</p> </blockquote> <p><strong>Is there any workaround for this?</strong></p> <p>I'm including my test code below. Please let me know if you see any problems with it.</p> <hr> <p><strong>ViewModel code</strong></p> <pre><code>public class MainViewModel { public List&lt;Plan&gt; Plans { get; set; } public int IdDisplayIndex { get; set; } public int NameDisplayIndex { get; set; } public int DescriptionDisplayIndex { get; set; } public MainViewModel() { Initialize(); } private void Initialize() { IdDisplayIndex = 1; NameDisplayIndex = 2; DescriptionDisplayIndex = 0; Plans = new List&lt;Plan&gt; { new Plan { Id = 1, Name = "Primary", Description = "Likely to work." }, new Plan { Id = 2, Name = "Plan B", Description = "Backup plan." }, new Plan { Id = 3, Name = "Plan C", Description = "Last resort." } }; } } </code></pre> <hr> <p><strong>Plan Class</strong></p> <pre><code>public class Plan { public int Id { get; set; } public string Name { get; set; } public string Description { get; set; } } </code></pre> <hr> <p><strong>Window code</strong> - this uses <a href="http://blogs.infragistics.com/blogs/josh_smith/archive/2008/06/26/data-binding-the-isvisible-property-of-contextualtabgroup.aspx" rel="noreferrer">Josh Smith's DataContextSpy</a></p> <pre><code>&lt;Window x:Class="WpfApplication1.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:WpfApplication1" xmlns:mwc="http://schemas.microsoft.com/wpf/2008/toolkit" Title="Main Window" Height="300" Width="300"&gt; &lt;Grid&gt; &lt;mwc:DataGrid ItemsSource="{Binding Plans}" AutoGenerateColumns="False"&gt; &lt;mwc:DataGrid.Resources&gt; &lt;local:DataContextSpy x:Key="spy" /&gt; &lt;/mwc:DataGrid.Resources&gt; &lt;mwc:DataGrid.Columns&gt; &lt;mwc:DataGridTextColumn Header="ID" Binding="{Binding Id}" DisplayIndex="{Binding Source={StaticResource spy}, Path=DataContext.IdDisplayIndex}" /&gt; &lt;mwc:DataGridTextColumn Header="Name" Binding="{Binding Name}" DisplayIndex="{Binding Source={StaticResource spy}, Path=DataContext.NameDisplayIndex}" /&gt; &lt;mwc:DataGridTextColumn Header="Description" Binding="{Binding Description}" DisplayIndex="{Binding Source={StaticResource spy}, Path=DataContext.DescriptionDisplayIndex}" /&gt; &lt;/mwc:DataGrid.Columns&gt; &lt;/mwc:DataGrid&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre> <hr> <p><strong>Note:</strong> If I just use plain numbers for <code>DisplayIndex</code>, everything works fine, so the problem is definitely with the bindings.</p> <hr> <p><strong>Update 5/1/2010</strong></p> <p>I was just doing a little maintenance on my project, and I noticed that when I ran it, the problem I discuss in this post had returned. I knew that it worked last time I ran it, so I eventually narrowed the problem down to the fact that I had installed a newer version of the WPF Toolkit (Feb '10). When I reverted to the June '09 version, everything worked fine again. So, I'm now doing something I should have done in the first place: I'm including the WPFToolkit.dll that works in my solution folder and checking it into version control. It's unfortunate, though, that the newer toolkit has a breaking change.</p>
 

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