Question

Firstly let me clarify (if the title wasn’t clear enough): I’m discussing System.Windows.Controls.DataGrid from the .NET 4.0 Framework, not the toolkit edition.

I’m currently building up a small re-usable set of classes/view models/etc in my project to build a rather powerfull DataGrid for my application.

Now, by default given an IEnumarable<> ItemsSource the DataGrid control supports header-clicking column sorting.

However, my implementation now uses a CollectionViewSource and ICollectionView to expose data members to the DataGrid. When hooked up in this fashion it seems to rely on the SortDescriptions to sort.

While I like having control from code (could be hooked into all sorts of things) I also require the ability for my users to click the header bars to sort thier results. I’m looking for a way to hook the header-bar clicks to signal my code to adjust the CollectionViewSource appropriately.

1. Am I going to have to re-style the header buttons to do fire the events?
2. Is there a way to hook the sort events from the DataGrid control’s existing headers?
3. What is the best way to go about this?
4. Am I using ICollectionView incorrectly?

Answer 1

Actually I found the answer. A complete blunder on my part. It stemmed from settings on the Columns in the DataGrid Control.

Had to make sure that CanUserSort="True" was set on the DataGridColumn, and that the SortMemberPath property was set.

Example:

            <DataGridTemplateColumn Header="Account #" Width="Auto" CanUserSort="True" SortMemberPath="AccountNum">
                <DataGridTemplateColumn.CellTemplate>
                    <DataTemplate>
                        <TextBlock Text="{Binding AccountNum}" />
                    </DataTemplate>
                </DataGridTemplateColumn.CellTemplate>
            </DataGridTemplateColumn>