WPF C＃：通过拖放重新排列列表框中的项目

我试着用observablecollection创建一个，看看

    ObservableCollection<Emp> _empList = new ObservableCollection<Emp>();    public Window1()    {        InitializeComponent();        _empList .Add(new Emp("1", 22));        _empList .Add(new Emp("2", 18));        _empList .Add(new Emp("3", 29));        _empList .Add(new Emp("4", 9));        _empList .Add(new Emp("5", 29));        _empList .Add(new Emp("6", 9));        listbox1.DisplayMemberPath = "Name";        listbox1.ItemsSource = _empList;        Style itemContainerStyle = new Style(typeof(ListBoxItem));        itemContainerStyle.Setters.Add(new Setter(ListBoxItem.AllowDropProperty, true));        itemContainerStyle.Setters.Add(new EventSetter(ListBoxItem.PreviewMouseLeftButtonDownEvent, new MouseButtonEventHandler(s_PreviewMouseLeftButtonDown)));        itemContainerStyle.Setters.Add(new EventSetter(ListBoxItem.DropEvent, new DragEventHandler(listbox1_Drop)));        listbox1.ItemContainerStyle = itemContainerStyle;    }

拖放过程

    void s_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)    {        if (sender is ListBoxItem)        { ListBoxItem draggedItem = sender as ListBoxItem; DragDrop.DoDragDrop(draggedItem, draggedItem.DataContext, DragDropEffects.Move); draggedItem.IsSelected = true;        }    }    void listbox1_Drop(object sender, DragEventArgs e)    {        Emp droppedData = e.Data.GetData(typeof(Emp)) as Emp;        Emp target = ((ListBoxItem)(sender)).DataContext as Emp;        int removedIdx = listbox1.Items.IndexOf(droppedData);        int targetIdx = listbox1.Items.IndexOf(target);        if (removedIdx < targetIdx)        { _empList.Insert(targetIdx + 1, droppedData); _empList.RemoveAt(removedIdx);        }        else        { int remIdx = removedIdx+1; if (_empList.Count + 1 > remIdx) {     _empList.Insert(targetIdx, droppedData);     _empList.RemoveAt(remIdx); }        }    }

注意：

• 在实现中很糟糕的一点是，由于它使用了

  PreviewMouseLeftButtonDown

  事件，因此被拖动的项目看起来好像未被选中
• 并且为了更容易实现，放置目标是列表框项目而不是列表框本身-为此可能需要更好的解决方案