WPF ListView 简单的拖拽实现(转)

首先设置ListView的AllowDrop=True；SelectionMode=Extended;并且ListView视图为GridVIew。

 private void listView1_MouseMove(object sender, MouseEventArgs e)
       {
           ListView listview = sender as ListView;
           if (e.LeftButton == MouseButtonState.Pressed)
           {
               System.Collections.IList list = listview.SelectedItems as System.Collections.IList;
               DataObject data = new DataObject(typeof(System.Collections.IList), list);
               if (list.Count > )
               {
                   DragDrop.DoDragDrop(listview, data, DragDropEffects.Move);
               }
           }
       }  

       private void listView1_Drop(object sender, DragEventArgs e)
       {
           if (e.Data.GetDataPresent(typeof(System.Collections.IList)))
           {
               System.Collections.IList peopleList = e.Data.GetData(typeof(System.Collections.IList)) as System.Collections.IList;
               //index为放置时鼠标下元素项的索引
               int index = GetCurrentIndex(new GetPositionDelegate(e.GetPosition));
               if (index > -)
               {
                   LogMessage Logmess = peopleList[] as LogMessage;
                   //拖动元素集合的第一个元素索引
                   int OldFirstIndex = StreamHelper.List.IndexOf(Logmess);
                   //下边那个循环要求数据源必须为ObservableCollection<T>类型，T为对象
                   for (int i = ; i < peopleList.Count; i++)
                   {
                       StreamHelper.List.Move(OldFirstIndex, index);
                   }
                   listView1.SelectedItems.Clear();
               }
           }
       }  

       private int GetCurrentIndex(GetPositionDelegate getPosition)
       {
           int index = -;
           for (int i = ; i < listView1.Items.Count; ++i)
           {
               ListViewItem item = GetListViewItem(i);
               if (item != null && this.IsMouseOverTarget(item, getPosition))
               {
                   index = i;
                   break;
               }
           }
           return index;
       }  

       private bool IsMouseOverTarget(Visual target, GetPositionDelegate getPosition)
       {
           Rect bounds = VisualTreeHelper.GetDescendantBounds(target);
           Point mousePos = getPosition((IInputElement)target);
           return bounds.Contains(mousePos);
       }  

       delegate Point GetPositionDelegate(IInputElement element);  

       ListViewItem GetListViewItem(int index)
       {
           if (listView1.ItemContainerGenerator.Status != GeneratorStatus.ContainersGenerated)
               return null;
           return listView1.ItemContainerGenerator.ContainerFromIndex(index) as ListViewItem;
       }  

其中StreamHelper.List是StreamHelper类里边有一个静态的ObservableCollection<LogMessage>集合名字为List；

LogMessage就是集合里边的T对象了；