ListView 拖拽实例

ListView 拖拽实例

实例内容：
ListView之间单项数据拖拽；
ListView之间多项数据拖拽；
ListView之间多项数据双向拖拽；
ListView内部位置移动；
ListView内部值的交换。

部分代码：

        #region  ListView之间单项数据拖拽
         private   void  listView4_ItemDrag( object  sender, ItemDragEventArgs e)
        {
            listView4.DoDragDrop(e.Item, DragDropEffects.Move);
        }

         private   void  listView5_DragEnter( object  sender, DragEventArgs e)
        {
            e.Effect  =  e.AllowedEffect;
        }

         private   void  listView5_DragDrop( object  sender, DragEventArgs e)
        {
            ListViewItem draggedItem  =  (ListViewItem)e.Data.GetData( typeof (ListViewItem));
            listView5.Items.Insert( 0 ,(ListViewItem)draggedItem.Clone());
        }
         #endregion

         #region  ListView之间多项数据拖拽
         private   void  listView2_ItemDrag( object  sender, ItemDragEventArgs e)
        {
            ListViewItem[] items  =   new  ListViewItem[((ListView)(sender)).SelectedItems.Count];
             int  i  =   0 ;

             foreach  (ListViewItem item  in  ((ListView)(sender)).SelectedItems)
            {
                items[i]  =  item;
                i ++ ;
            }

            ((ListView)(sender)).DoDragDrop( new  DataObject( " System.Windows.Forms.ListViewItem() " , items), DragDropEffects.Copy);
        }

         private   void  listView3_DragEnter( object  sender, DragEventArgs e)
        {
             if  (e.Data.GetDataPresent( " System.Windows.Forms.ListViewItem() " ))
            {
                e.Effect  =  DragDropEffects.Copy;
            }
             else
            {
                e.Effect  =  DragDropEffects.None;
            }
        }   

         private   void  listView3_DragDrop( object  sender, DragEventArgs e)
        {
            ListViewItem[] items  =  (ListViewItem[])(e.Data.GetData( " System.Windows.Forms.ListViewItem() " ));
             int  i  =   0 ;

             foreach  (ListViewItem item  in  items)
            {
                ListViewItem listItem  =   new  ListViewItem(items[i].Text,item.ImageIndex);
                listItem.SubItems.Add(items[i].SubItems[ 1 ].Text);
                listItem.SubItems.Add(items[i].SubItems[ 2 ].Text);
                ((ListView)(sender)).Items.Add(listItem);
                 try
                {
                     if  (sender  ==  listView3)
                    {
                       listView2.Items.Remove(listView2.SelectedItems[ 0 ]);                       
                    }
                }
                 catch  (Exception exc)
                {
                    MessageBox.Show(exc.Message);
                }
                
                i ++ ;
            }
        }
         #endregion

         #region   ListView内部位置移动
         private   void  listView1_ItemDrag( object  sender, ItemDragEventArgs e)
        {
            listView1.DoDragDrop(e.Item, DragDropEffects.Move);
        }

         private   void  listView1_DragEnter( object  sender, DragEventArgs e)
        {
            e.Effect  =  e.AllowedEffect;
        }

         private   void  listView1_DragOver( object  sender, DragEventArgs e)
        {
            Point targetPoint  =  listView1.PointToClient( new  Point(e.X, e.Y));
             int  targetIndex  =  listView1.InsertionMark.NearestIndex(targetPoint);

             if  (targetIndex >- 1 )
            {
                Rectangle itemBounds  =  listView1.GetItemRect(targetIndex);
                 if  (targetPoint.X > itemBounds.Left + (itemBounds.Width / 2 ))
                {
                    listView1.InsertionMark.AppearsAfterItem  =   true ;
                }
                 else
                {
                    listView1.InsertionMark.AppearsAfterItem  =   false ;
                }
            }
            listView1.InsertionMark.Index  =  targetIndex;
        }

         private   void  listView1_DragLeave( object  sender, EventArgs e)
        {
            listView1.InsertionMark.Index  =   - 1 ;
        }

         private   void  listView1_DragDrop( object  sender, DragEventArgs e)
        {
             int  targetIndex  =  listView1.InsertionMark.Index;
             if  (targetIndex ==- 1 )
            {
                 return ;
            }

             if  (listView1.InsertionMark.AppearsAfterItem)
            {
                targetIndex ++ ;
            }

            ListViewItem draggedItme  =  (ListViewItem)e.Data.GetData( typeof (ListViewItem));

            listView1.Items.Insert(targetIndex,(ListViewItem)draggedItme.Clone());
            listView1.Items.Remove(draggedItme);
        }

         private   class  ListViewIndexComparer : System.Collections.IComparer
        {
             public   int  Compare( object  x,  object  y)
            {
                 return  ((ListViewItem)x).Index  -  ((ListViewItem)y).Index;
            }
        }
         #endregion         

。。。。。。
下载： http://files.cnblogs.com/EasyData/ListViewDragTest.rar