WPF double sorting in DataGrid

Question

I have custom sorting for IP column with reset. And I have reseting for other columns

public static void SortHandler(object sender, DataGridSortingEventArgs e)
    {            
        DataGrid dataGrid = sender as DataGrid;
        string sortPropertyName = Helpers.GetSortMemberPath(e.Column);           

        if (!string.IsNullOrEmpty(sortPropertyName))
        {
            Console.WriteLine(sortPropertyName);
            if (sortPropertyName == "Ip")
            {   
                IComparer comparer = null;                   
                e.Handled = true;         

                if (e.Column.SortDirection.HasValue && e.Column.SortDirection.Value == ListSortDirection.Descending)
                {
                    e.Column.SortDirection = null;                        
                }
                else
                {
                    ListSortDirection direction = (e.Column.SortDirection != ListSortDirection.Ascending) ? ListSortDirection.Ascending : ListSortDirection.Descending;                        
                    e.Column.SortDirection = direction;
                    comparer = new SortIPAddress(direction);
                }                    
                ListCollectionView lcv = (ListCollectionView)CollectionViewSource.GetDefaultView(dataGrid.ItemsSource);                   
                lcv.CustomSort = comparer;
            }                
            // sorting is cleared when the previous state is Descending
            if (e.Column.SortDirection.HasValue && e.Column.SortDirection.Value == ListSortDirection.Descending)
            {                    
                int index = Helpers.FindSortDescription(dataGrid.Items.SortDescriptions, sortPropertyName);
                if (index != -1)
                {
                    e.Column.SortDirection = null;                       
                    dataGrid.Items.SortDescriptions.RemoveAt(index);
                    dataGrid.Items.Refresh();

                    if ((Keyboard.Modifiers & ModifierKeys.Shift) != ModifierKeys.Shift)
                    {                            
                        dataGrid.Items.SortDescriptions.Clear();
                        dataGrid.Items.Refresh();
                    }

                    // stop the default sort
                    e.Handled = true;
                }
            }
        }             
    }

But if I do double sorting with shift , sorting for IP column resets.How to fix double sorting? Forum ask for more details, but I do not know what else to add

Answer 1

Could you modify your code to add the sorting groups like so

DataG.SortDescriptions.Add(new SortDescription("col1", ListSortDirection.Ascending));
DataG.SortDescriptions.Add(new SortDescription("col2", ListSortDirection.Ascending));

which would apply sorting as you described.

Answer 2

If your data is coming from a collection of some class type, add a custom property that is combination of multiple fields...

public class YourClassType
{
   public string SomeColumn {get; set;}
   public int SomeInt {get; set; }
   ...

   public string SortCombination { get { return SomeColumn + SomeSort; }}
}

Then in the xaml data grid column, set the "SortMemberPath" to that property name. Ex:

SortMemberPath = "SortCombination";

No extra "helper" to sort / double-sort... it uses the one column as the sort basis. You could even format the number to be sure properly justified same length depending on its content.