Question

I’m trying to implement a C# drag and drop row-reorder with a listview which would then update an SQL database with the current order of the rows. I’ve come across some snippets of code on the internet (one from this website which implemented a ‘var’ class) but none seem to be working with my needs. I don’t need help updating the database as I have a good idea how I’d do this, but can’t seem to get the row reordering to work correctly, any input would be appreciated.

-thanks

m&a

Answer 1

1. Ensure that AllowDragDrop is set to true.

2. Implement handlers for at least these 3 events

   private void myList_ItemDrag(object sender, ItemDragEventArgs e)
       {
           DoDragDrop(e.Item, DragDropEffects.Link);
       }
   
       private void myList_DragEnter(object sender, DragEventArgs e)
       {
           e.Effect = DragDropEffects.Link;
       }
   
       private void myList_DragDrop(object sender, DragEventArgs e)
       {
           // do whatever you need to reorder the list.
       }
   

   Getting the index of the row you dropped onto may look something like:

   Point cp = myList.PointToClient(new Point(e.X, e.Y));
   ListViewItem dragToItem = myList.GetItemAt(cp.X, cp.Y);
   int dropIndex = dragToItem.Index;