Drag and drop issue in between two data grids in WPF

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Hi All,

I'm developing an application in WPF, in it I use a DataGrids

.Here i am trying to implementing drag and drop functionality in between two grids.I am trying drag row from one datagrid and dropping to another datagrid.
Here i am using the below code.
XAML code

 <DataGrid HorizontalAlignment="Left" AutoGenerateColumns="True" Name="SourceGrid" Margin="12,29,0,12" Width="325" PreviewMouseLeftButtonDown="SourceGrid_PreviewMouseLeftButtonDown" />
<DataGrid Name="DestGrid" AutoGenerateColumns="True" HorizontalAlignment="Right" AllowDrop="True" Margin="0,29,16,12" Width="325" Drop="DestGrid_Drop"/>

XAML.CS code is

private void SourceGrid_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            DataGrid parent = (DataGrid)sender;
            dragSource = parent;
            object data = GetDataFromSourceGrid(dragSource, e.GetPosition(parent));

            if (data != null)
            {
                DragDrop.DoDragDrop(parent, data, DragDropEffects.Move);
            }
        }
        private static object GetDataFromSourceGrid(DataGrid source, Point point)
        {
            UIElement element = source.InputHitTest(point) as UIElement;
            if (element != null)
            {
                object data = DependencyProperty.UnsetValue;
                while (data == DependencyProperty.UnsetValue)
                {
                    data = source.ItemContainerGenerator.ItemFromContainer(element);

                    if (data == DependencyProperty.UnsetValue)
                    {
                        element = VisualTreeHelper.GetParent(element) as UIElement;
                    }

                    if (element == source)
                    {
                        return null;
                    }
                }

                if (data != DependencyProperty.UnsetValue)
                {
                    return data;
                }
            }

            return null;
        }

        private void DestGrid_Drop(object sender, DragEventArgs e)
        {
            DataGrid parent = (DataGrid)sender;
            object data = e.Data.GetData(typeof(string));
            ((IList)dragSource.ItemsSource).Remove(data);
            parent.Items.Add(data);
        }

Here every thing is working fine but in

DestGrid_Drop

event

object data = e.Data.GetData(typeof(string));

this line i am getting null value.

Any one could you please help me.

What I have tried:

i tried so many articles.Same code if i can apply to Listboxes it's working fine.

Posted 19-Aug-19 21:26pm

Ram349

Updated 5-Sep-19 20:42pm

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3 solutions

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Maciej Los · Answer 1 · 2019-08-19T21:39:00

Solution 1

Check out this:
WPF 4 DataGrid Row Drag and Drop | DotNetCurry[^]
Drag and Drop DataGrid Row in WPF[^]

You've missed the part which is responsible for row selecting.

Posted 19-Aug-19 21:39pm

Maciej Los

Comments

Ram349 20-Aug-19 3:55am

Hi Maciej Los,
Thanks for responding my post.I am doing dragging row from one data grid to another data grid.
I tried your one that one not worked.Could you please share any suggestion.

Richard Deeming · Answer 2 · 2019-08-22T02:40:00

Solution 2

The GongSolutions.WPF.DragDrop library includes an example of drag and drop between two DataGrids:
GitHub - punker76/gong-wpf-dragdrop: The GongSolutions.WPF.DragDrop library is a drag'n'drop framework for WPF[^]
gong-wpf-dragdrop/DataGridSamples.xaml at dev · punker76/gong-wpf-dragdrop · GitHub[^]

Posted 22-Aug-19 2:40am

Richard Deeming

Comments

Maciej Los 22-Aug-19 8:45am

:thumbsup:

PureNsanity · Answer 3 · 2019-09-05T20:42:00

If your source DataGrid has a list of string items (which I don't know why you'd really be using a DataGrid in that case) then change this method:

private void DestGrid_Drop(object sender, DragEventArgs e)
{
    DataGrid parent = (DataGrid)sender;
    object data = e.Data.GetData(typeof(string));
    ((IList)dragSource.ItemsSource).Remove(data);
    parent.Items.Add(data);
}

Change it to:

private void DestGrid_Drop(object sender, DragEventArgs e)
{
    DataGrid parent = (DataGrid)sender;

    // If the DataObject contains string data, extract it.
    if (e.Data.GetDataPresent(DataFormats.StringFormat))
    {
        var data = (string)e.Data.GetData(DataFormats.StringFormat);
        ((IList)dragSource.ItemsSource).Remove(data);
        parent.Items.Add(data);
    }
}