validate listcontrol items after drag and drop

[Elizabeth]

Hi,

I have implemented the RadItemDragDropManager example that allows me to drag multiple list items from one list control to another.

I need to validate that the user is not dragging certain incompatible list items into the destination list control.

The problem is that when dragging multiple items, the selected items collection isn't really preserved.

How can I compare the items being dragged to the items in the destination list control?

Thank you!
Beth

[Peter]

Hi Elizabeth,

Thank you for contacting Telerik support.

I would like to clarify that RadItemDragDropManager example does not support scrolling and you can Drag&Drop only visible items. I can suggest checking the items in BeginDrag method. For example:

private void BeginDrag(MouseEventArgs e)
{
    RadListDataItem[] selectedItems = new RadListDataItem[ this.sourceListBox.SelectedItems.Count];//TODO Count!=0
    this.sourceListBox.SelectedItems.CopyTo(selectedItems,0);
    foreach (RadListDataItem item in selectedItems)
    {
        if(item.Text.Contains("Tuna Salad"))//exclude this item from D&D
        {
            item.Selected = false;
        }
    }

I hope this will be useful for you. Should you have further questions, I would be glad to help.

Greetings,
Peter
the Telerik team