WPF Datagrid: Clear column sorting

13
votes

I am using a WPF Datagrid in my application where columns can be sorted by clicking on the header.

I was wondering if there was any way to clear a column's sorting programatically ?

I tried sorting a column and then clearing MyDataGrid.Items.SortDescriptions, but that collection was empty (even though one column was sorted).

I also tried :

MyDataGridColumn.SortDirection = null;

The problem is that the column indication is gone, but the sorting still occurs when editing a cell and switching rows.

Is there no way to clear a column's sort ?

Edit (for clarity): The problem is that I'd like to allow sorting again if the user re-clicks on the same column header, so setting CanUserSort to false would be problematic, even if it were done in the XAML. In short, what I'm attempting to do, is prevent rows from being ordered once a sorted column has a cell that was modified. I want to force the user to re-click on the header.

7
c#wpfwpfdatagrid
I did not know it would resort when you edit a row. – paparazzo
@Blam Yep it does. If you select another row, the cell that was edited will have its row sorted. – Hussein Khalil
Clear from the CollectionView for example: stackoverflow.com/questions/5401912/… – Vibes

7 Answers

16
votes

Here is what you need:

using System.Windows.Data;
using System.ComponentModel;

ICollectionView view = CollectionViewSource.GetDefaultView(grid.ItemsSource);
if (view != null)
{
    view.SortDescriptions.Clear();
    foreach (DataGridColumn column in grid.Columns)
    {
        column.SortDirection = null;
    }
}

Original source: https://stackoverflow.com/a/9533076/964053

What I want to know is what was M$ thinking for not putting a ClearSort() method...

4
votes

Set CanUserSort to false for all columns -

foreach (var a in MyDataGrid.Columns)
{
    a.CanUserSort = false;
}
3
votes

as an extension...

    public static  void ClearSort(this DataGrid grid)
    {
        var view = CollectionViewSource.GetDefaultView(grid.ItemsSource);
        view?.SortDescriptions.Clear();

        foreach (var column in grid.Columns)
        {
            column.SortDirection = null;
        }
    }
0
votes

In XAML you can turn it off using this code.

<DataGridTextColumn Header="Header Name" CanUserSort="False"/>
0
votes

This is what I use in my program (I have a RESET button and use this to clear the sorting on a datagrid).

System.Windows.Data.CollectionViewSource.GetDefaultView(MY_DATA_GRID.ItemsSource).SortDescriptions.Clear();

Works like a charm.

Cheers, Iato

-2
votes

In the XAML code of DataGrid you can add CanUserSortColumns="False". Then noboady would be able to sort any column at rumtime.

-2
votes

This is a small code snippet to disable the sorting of DataGridView.

for (int i = 0; i < dataGridView1.ColumnCount; i++)
{
    dataGridView1.Columns[i].SortMode = DataGridViewColumnSortMode.NotSortable;
}