C#ListView详解(三)

最新推荐文章于 2023-03-06 00:53:10 发布

玄之

最新推荐文章于 2023-03-06 00:53:10 发布

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分类专栏：控件Control 文章标签： listview DragDrop C#ListView 拖放

本文链接：https://blog.youkuaiyun.com/kang_xuan/article/details/75808096

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本文详细介绍了如何在C#中使用ListView进行拖放操作，包括ListViewItem的重新排序及两个ListView之间的拖放效果，提供了相关的代码示例。

了解ListView的成员和简单demo请查看详解一和详解二
Demo3:
拖放ListVIewItem实现重新排序
注意拖放的事件发生顺序(讲解一)
Code:

        private void btnDemo3_Click(object sender, EventArgs e)
        {
            lvContainer.BeginUpdate();
            lvContainer.Clear();
            //如果不设置为View.List则会导致ListView.Items.Insert函数插入的ListViewItem在最后一项
            lvContainer.View = View.List;
            //必须设置为true
            lvContainer.AllowDrop = true;
            lvContainer.SmallImageList = imageListSource;
            for (int i = 0; i < 10; i++)
            {
                ListViewItem item = new ListViewItem();
                item.ImageIndex = 0;
                item.Text = i.ToString();
                lvContainer.Items.Add(item);
            }
            lvContainer.EndUpdate();
        }

        //开始拖放项
        private void lvContainer_ItemDrag(object sender, ItemDragEventArgs e)
        {
            //继承Control的函数,当调用此函数后,DragDrop事件完成后，才会执行之后的代码
            lvContainer.DoDragDrop(e.Item, DragDropEffects.Copy);
        }
        private void lvContainer_DragEnter(object sender, DragEventArgs e)
        {
            e.Effect = e.AllowedEffect;
        }

        private void lvContainer_DragDrop(object sender, DragEventArgs e)
        {
            int nearestItemIndex = lvContainer.InsertionMark.NearestIndex(lvContainer.PointToClient(new Point(e.X, e.Y)));
            ListViewItem item = (ListViewItem)e.Data.GetData(typeof(ListViewItem));
            lvContainer.Items.Insert(nearestItemIndex, (ListViewItem)item.Clone());
            lvContainer.Items.Remove(item);
        }

Effect Picture:
![这里写图片描述](https://img-blog.youkuaiyun.com/20170723080724205?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQva2FuZ194dWFu/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)

Demo4:
两个ListView之间进行ListViewItem拖放效果
Code

//进行数据加载
        private void ListItemDragDropDemo_Load(object sender, EventArgs e)
        {
            //设置源ListView
            lvSource.LargeImageList = iList;
            lvSource.View = View.LargeIcon;
            lvSource.AllowDrop = true;
            for (int i = 0; i < 10; i++)
            {
                ListViewItem item = new ListViewItem();
                item.ImageIndex = 0;
                item.Text = i.ToString();
                lvSource.Items.Add(item);
                item.Tag = (i + 10).ToString();
            }

            //设置目标ListView
            lvDestination.LargeImageList = iList;
            lvDestination.View = View.LargeIcon;
            lvDestination.AllowDrop = true;
        }

        private void lvSource_ItemDrag(object sender, ItemDragEventArgs e)
        {
            lvSource.DoDragDrop(e.Item, DragDropEffects.Copy);
        }

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

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

        private void lvDestination_DragDrop(object sender, DragEventArgs e)
        {
           ListViewItem item=(ListViewItem)e.Data.GetData(typeof(ListViewItem));
            //由于不需要进行重新排序，所以进行Item增加即可，View不采用List
           lvDestination.Items.Add((ListViewItem)item.Clone());
           lvSource.Items.Remove(item);
        }

Effect Pictrue
![这里写图片描述](https://img-blog.youkuaiyun.com/20170723081617782?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQva2FuZ194dWFu/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)