c# winform listview 拖放排序

来源：互联网发布：java sip 协议栈编辑：程序博客网时间：2024/05/17 04:14

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)
        {

        }
    }
}