Question

I am working an a sortable WPF ListView and I made a lot of progress already. It’s not so hard since there is a lot of stuff on the internet already. But there is a little bit of information I am still missing.

With a Column like that:

<GridViewColumn Width="200" Header="Fahrzeugname" DisplayMemberBinding="{Binding Name}">

I can sort it like this:

Binding columnBinding = column.DisplayMemberBinding as Binding;

if (columnBinding != null)
{
    sorts.Clear();
    sorts.Add(new SortDescription(columnBinding.Path.Path, direction));
    lastColumnSorted = column;
}

But my problem is I don’t have a DisplayMemberBinding since I use a DataTemplate:

<DataTemplate>
    <TextBlock Text="{Binding Name}" TextAlignment="Left"/>
</DataTemplate>

How do I get the Binding property for this column in the C# Code?

Answer 1

I wrote a set of attached properties to do exactly what Kent suggested, you can check it out here

---

EDIT : as requested, here’s a sample of a command for GridViewSort.Command :

    private ICommand _sortCommand;
    public ICommand SortCommand
    {
        get
        {
            if (_sortCommand == null)
            {
                _sortCommand = new RelayCommand(SortPersonsBy);
            }
            return _sortCommand;
        }
        set { _sortCommand = value; }
    }

    private void SortPersonsBy(object param)
    {
        string propertyName = param as string;
        ICollectionView view = CollectionViewSource.GetDefaultView(_persons);
        ListSortDirection direction = ListSortDirection.Ascending;
        if (view.SortDescriptions.Count > 0)
        {
            SortDescription currentSort = view.SortDescriptions[0];
            if (currentSort.PropertyName == propertyName)
            {
                if (currentSort.Direction == ListSortDirection.Ascending)
                    direction = ListSortDirection.Descending;
                else
                    direction = ListSortDirection.Ascending;
            }
            view.SortDescriptions.Clear();
        }
        if (!string.IsNullOrEmpty(propertyName))
        {
            view.SortDescriptions.Add(new SortDescription(propertyName, direction));
        }
    }

(it actually implements the same behavior as when GridViewSort.AutoSort is set to true…)