.net C# listbox的上下移动,拖动排序,两个listbox相互拖动

 定义多个Listbox,可以实现相互拖动,如listbox1,listbox2,设置如下allowdrop=true和

this.listBox2.DragDrop += new System.Windows.Forms.DragEventHandler(this.ListBox1_DragDrop);
            this.listBox2.MouseDown += new System.Windows.Forms.MouseEventHandler(this.ListBox1_MouseDown);
            this.listBox2.DragOver += new System.Windows.Forms.DragEventHandler(this.ListBox1_DragOver);

 

   private   void  moveUpListBox(ListBox ListBox1)  // 向上移动
         ... {
            //by 闫磊 Email:[email protected],[email protected] 2007.10.11
            //若不是第一行则上移
            if (ListBox1.SelectedIndex > 0)
            ...{

                int index = ListBox1.SelectedIndex;
                string temp = ListBox1.Items[index - 1].ToString();
                ListBox1.Items[index - 1] = ListBox1.SelectedItem.ToString(); ;
                ListBox1.Items[index] = temp;
                ListBox1.SelectedIndex = index - 1;


            }
        }
         private   void  moveDownListBox(ListBox ListBox1)   /**/ /**/ /**/ ////向下移动
         ... {
            //若不是第最后一行则下移
            if (ListBox1.SelectedIndex < ListBox1.Items.Count - 1)
            ...{

                int index = ListBox1.SelectedIndex;
                string temp = ListBox1.Items[index + 1].ToString();
                ListBox1.Items[index + 1] = ListBox1.SelectedItem.ToString(); ;
                ListBox1.Items[index] = temp;
                ListBox1.SelectedIndex = index + 1;
                //ListBox1.val



            }
        }
         private   void  button1_Click( object  sender, EventArgs e)  // 调用向上移动
         ... {
            moveUpListBox(ListBox1);

        }

         private   void  button2_Click( object  sender, EventArgs e)  // 调用向下移动
         ... {
            moveUpListBox(ListBox1);
        }
        // 下面是拖动
       // by 闫磊 Email:[email protected],[email protected] 2007.10.11

         private  ListBox sourcelbl; // 拖动源


         private   void  ListBox1_DragOver( object  sender, DragEventArgs e)
         ... {

            //拖动源和放置的目的地一定是一个ListBox
            if (e.Data.GetDataPresent(typeof(System.String)))
            ...{
                e.Effect = DragDropEffects.Move;
            }
            else
                e.Effect = DragDropEffects.None;

        }

         private   void  ListBox1_DragDrop( object  sender, DragEventArgs e)
         ... {


            ListBox listbox = (ListBox)sender;
            int indexoftarget = listbox.IndexFromPoint(listbox.PointToClient(new Point(e.X, e.Y)));

            //拖动源和放置的目的地可能不一样
            int idx = -1;
            for (int i = sourcelbl.SelectedItems.Count - 1; i == 0; i--)
            ...{
                if (!listbox.Equals(sourcelbl) && indexoftarget == -1)
                ...{
                    idx = listbox.Items.Add(sourcelbl.SelectedItems[i].ToString());

                }
                else
                ...{
                    listbox.Items.Insert(indexoftarget, sourcelbl.SelectedItems[i].ToString());


                }

            }
            sourcelbl.Items.RemoveAt(sourcelbl.SelectedIndex);

            if (idx > -1)
            ...{
                listbox.SelectedIndex = idx;
            }
            else
                listbox.SelectedIndex = indexoftarget;

        }


         private   void  ListBox1_MouseDown( object  sender, MouseEventArgs e)
         ... {
            sourcelbl = (ListBox)sender;
            int indexofsource = sourcelbl.SelectedIndex;
            if (indexofsource > -1)
            ...{
                sourcelbl.DoDragDrop(sourcelbl.Items[indexofsource].ToString(), DragDropEffects.All);

            }

        }

 

//本文参考:http://blog.csdn.net/J_S_S/archive/2007/06/02/1635012.aspx,对本文的作者表示由衷感谢