c# winform listview 拖放排序

源代码 http://download.csdn.net/detail/songconglai/5190885

建个winform工程 添加 listview 控件       设置 allowDrop 为true  ，添加DragDrop，DragEnter，DragLeave，DragOver事件

  public Form1()

        {

            InitializeComponent();

            listView1.ListViewItemSorter = new ListViewIndexComparer();

        }

        private void button1_Click(object sender, EventArgs e)

        {

        }

        //启动拖拽，设置拖拽的数据和效果。

        private void listView1_ItemDrag(object sender, ItemDragEventArgs e)

        {

            listView1.DoDragDrop(e.Item, DragDropEffects.Move);

        }

        //拖拽进入ListView，判断拖拽的数据格式，并设置拖拽的效果。

        private void listView1_DragEnter(object sender, DragEventArgs e)

        {

            e.Effect = e.AllowedEffect;

            //e.Effect = DragDropEffects.Move;

        }

        //拖动经过ListView时，设置拖动的效果，显示拖放位置线

        private void listView1_DragOver(object sender, DragEventArgs e)

        {

            Point ptScreen = new Point(e.X, e.Y);

            Point pt = listView1.PointToClient(ptScreen);

            ListViewItem item = listView1.GetItemAt(pt.X, pt.Y);

            int targetIndex = listView1.InsertionMark.NearestIndex(pt);

            if (targetIndex >-1)

            {

                Rectangle itemBounds = listView1.GetItemRect(targetIndex);

                if (pt.X > itemBounds.Left + (itemBounds.Width / 2))

                {

                    listView1.InsertionMark.AppearsAfterItem = true;

                }

                else {

                    listView1.InsertionMark.AppearsAfterItem = false;

                }

            }

            listView1.InsertionMark.Index = targetIndex;

            //if (item != null)

            //    item.Checked = true;

        }

        //拖拽释放，移动行

        private void listView1_DragDrop(object sender, DragEventArgs e)

        {

            int targetIndex = listView1.InsertionMark.Index;

            if (targetIndex == -1)

            {

                return;

            }

            if (listView1.InsertionMark.AppearsAfterItem)

            {

                targetIndex++;

            }

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

            //Point ptScreen = new Point(e.X, e.Y);

            //Point pt = listView1.PointToClient(ptScreen);

            //ListViewItem targetItem = listView1.GetItemAt(pt.X, pt.Y);//拖动的项将放置于该项之前

            //if (null == targetItem || targetItem == draggedItem)

            //    return;

            // NeedForFix: 项实际已经交换，但是显示没有交换

            listView1.BeginUpdate();

            listView1.Items.Insert(targetIndex, (ListViewItem)draggedItem.Clone());

            listView1.Items.Remove(draggedItem);

            listView1.EndUpdate();

        }

        private void listView1_DragLeave(object sender, EventArgs e)

        {

            listView1.InsertionMark.Index = -1;

        }

        private class ListViewIndexComparer : System.Collections.IComparer

        {

            public int Compare(object x, object y)

            {

                return ((ListViewItem)x).Index - ((ListViewItem)y).Index;

            }

        }

        private void listView1_SelectedIndexChanged(object sender, EventArgs e)

        {

        }

    }

}