Drag & Drop from/to multiple listboxes in WPF using MVVM

I have ListBoxes I create dynamically (according to the number of teams in DB). Each ListBox contains User objects. I want to be able to drag and drop users from one ListBox to another. All the examples I could find were to drag and drop from one predefined source list to another predefined target ListBox.

我有动态创建的ListBox（根据DB中的团队数量）。每个ListBox都包含User对象。我希望能够将用户从一个ListBox拖放到另一个ListBox。我能找到的所有示例都是从一个预定义的源列表拖放到另一个预定义的目标ListBox。

How this can be implemented?

如何实现？

1 个解决方案

#1

I don't have time to test this right now, but could you try attaching the events from Joby's link to your dynamically created ListBoxes? It would look something like:

我现在没有时间对此进行测试，但您是否可以尝试将Joby链接中的事件附加到动态创建的ListBox中？它看起来像：

// Create an instance of the control
var control = Activator.CreateInstance(ListBox);

control.PreviewMouseLeftButtonDown += ListBox_PreviewMouseLeftButtonDown;
control.Drop += ListBox_Drop;

For completeness, in case the source link disappears, here are the event handlers from http://www.c-sharpcorner.com/uploadfile/dpatra/drag-and-drop-item-in-listbox-in-wpf/

为了完整性，如果源链接消失，以下是来自http://www.c-sharpcorner.com/uploadfile/dpatra/drag-and-drop-item-in-listbox-in-wpf/的事件处理程序

ListBox dragSource = null;
private void ListBox_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
   ListBox parent = (ListBox)sender;
   dragSource = parent;
   object data = GetDataFromListBox(dragSource, e.GetPosition(parent));

   if (data != null)
   {
      DragDrop.DoDragDrop(parent, data, DragDropEffects.Move);
   }
}

#region GetDataFromListBox(ListBox,Point)
private static object GetDataFromListBox(ListBox 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;
 }

#endregion

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

#1