Cell Highlighing in WPF DataGrid

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I am using the below method to highlight cells from my code-behind for my data grid. But the problem is that when I scroll out of view, the highlighted cells are getting lost and are jumping around. I have set both row and column virtualization to false. please help.

C#

public void ColourCell(int row, int column, Color color, bool HighlightFlag = true)
        {
            DataGridRow rowContainer = GetRow(row);

            if (rowContainer != null)
            {
                DataGridCellsPresenter presenter = GetVisualChild<DataGridCellsPresenter>(rowContainer);
                // try to get the cell but it may possibly be virtualized but enable virtualizion is off
                DataGridCell cell = (DataGridCell)presenter.ItemContainerGenerator.ContainerFromIndex(column);
                // now try to bring into view and retreive the cell
                if (cell != null)
                {
                    if (HighlightFlag == false)
                        cell.Background = new SolidColorBrush(Colors.MediumPurple);
                    else
                    {
                        cell.Background = new SolidColorBrush(color);
                    }
                }
            }
        }

C#

public DataGridRow GetRow(int index)
        {
            DataGridRow row = (DataGridRow)DataGridControl.ItemContainerGenerator.ContainerFromIndex(index);
            if (row == null)
            {
                row = (DataGridRow)DataGridControl.ItemContainerGenerator.ContainerFromIndex(index);
            }
            return row;
        }

C#

static T GetVisualChild<T>(Visual parent) where T : Visual
        {
            T child = default(T);
            int numVisuals = VisualTreeHelper.GetChildrenCount(parent);
            for (int i = 0; i < numVisuals; i++)
            {
                Visual v = (Visual)VisualTreeHelper.GetChild(parent, i);
                child = v as T;
                if (child == null)
                {
                    child = GetVisualChild<T>(v);
                }
                if (child != null)
                {
                    break;
                }
            }
            return child;
        }

Posted 29-May-13 3:12am

rohith naik

Updated 11-Jan-18 7:21am

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Kenneth Haugland · Answer 1 · 2013-05-29T03:31:00

Solution 1

The XAML version is much better:
http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/a5fd5413-f055-4b56-83af-6d6bdb1d6fe9/[^]

Posted 29-May-13 3:31am

Kenneth Haugland

Comments

rohith naik 29-May-13 10:02am

Please help me with the problem I have. Your link is almost completely irrelevant.

Kenneth Haugland 29-May-13 10:29am

I dont actually think so, with a IValueConverter I dont think your problem will occur.

rohith naik 30-May-13 7:07am

Can you atleast tell me why you think using a IValueConverter will help my problem ?

Graeme_Grant 12-Jan-18 3:55am

WPF controls work best if you use Data Binding.

IValueConverter or IMultiValueConverter use the value passed and outputs a modified value using data binding. So you can pass any value to the converter and output the calculated value for that property.

rohith naik 30-May-13 7:34am

Additionally, I am not using XAML as there is a very complex logic to which cells I want to highlight. This works fine if the datagrid fits into 'one page' of sorts, i.e, there is no need to scroll. But if i scroll down and lose sight of the cell, The background change which I made jumps around.

Shamim Ahamed Pavel · Answer 2 · 2018-01-11T07:16:00

This code will help you.

C#

private void GetCell(DataGridRow row, DataGridColumn column)
{

    DependencyObject parent = row;

    Lable1:

    for (int i = 0; i < VisualTreeHelper.GetChildrenCount(parent); i++)
    {
        var item = VisualTreeHelper.GetChild(parent, i);
        if (item is DataGridCellsPresenter)
        {
            DataGridCellsPresenter presenter = item as DataGridCellsPresenter;

            DataGridCell cell = presenter.ItemContainerGenerator.ContainerFromIndex(1) as DataGridCell;

            cell.Background = Brushes.Red;

            break;
        }
        else
        {
            parent = item;
            goto Lable1;
        }
    }
}

Cell Highlighing in WPF DataGrid

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Cell Highlighing in WPF DataGrid

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