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POSorting Columns of type decimal? (nullable) in WPF DataGrid
 

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  1. POSorting Columns of type decimal? (nullable) in WPF DataGrid
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    <p>I am working with a <code>DataGrid</code> in WPF with several <code>decimal</code> columns. I recently changed the bound properties to <code>decimal?</code>s and now these columns are not able to be sorted by clicking on the header (as my other columns are). However, I can still sort them using methods in my code-behind. Does anybody know if it's possible to sort the <code>decimal?</code> columns by clicking the header or what the reason behind it is if it's not possible? Here is my relevant code:</p> <p>A couple of the columns in question (The attribute attaches to a behavior for the DataGrid. Enabling/disabling the behavior makes no difference):</p> <pre><code>[Column("PPAvg", 7)] public decimal? ProjectedPointsAvg { get; set; } [Column("PPHi", 8)] public decimal? ProjectedPointsHi { get; set; } [Column("PPLo", 9)] public decimal? ProjectedPointsLo { get; set; } </code></pre> <p>The DataGrid itself:</p> <pre><code>&lt;DataGrid x:Name="poolDataGrid" Grid.Row="1" CanUserAddRows="False" IsReadOnly="True" MouseDoubleClick="poolDataGrid_MouseDoubleClick"&gt; &lt;i:Interaction.Behaviors&gt; &lt;local:ColumnHeaderBehavior /&gt; &lt;/i:Interaction.Behaviors&gt; &lt;/DataGrid&gt; </code></pre> <p>I can still sort via code-behind using something like this:</p> <pre><code>var col = poolDataGrid.Columns.SingleOrDefault(c =&gt; c is DataGridTextColumn &amp;&amp; c.Header.ToString() == "PPHi"); poolDataGrid.Items.SortDescriptions.Add(new SortDescription(col.SortMemberPath, ListSortDirection.Descending)); </code></pre> <p>Unfortunately, I don't have much else to add. If anybody could help me out with this I would greatly appreciate it.</p>
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