列表视图不允许我使用当前代码拖放 [英] List View Doesn't Allow Me To Drag and Drop With Current Code

问题描述

嘿，我只是想知道为什么winforms不喜欢我的代码？

当我试图拖放时，它似乎给了我一个没有诅咒的迹象..

 private void textureListView_ItemDrag（object sender，ItemDragEventArgs e）
 {
 itemsToMove =（from object textureListView.SelectedItems中的item选择项）.ToList（）; 
 numItems = textureListView.Items.Count; 
 textureListView.DoDragDrop（e.Item，DragDropEffects.None）; 
 
 
} 
 private void textureListView_DragEnter（object sender，DragEventArgs e）
 {
 
 e.Effect = DragDropEffects.None; 
 / * 
 for（int i = 0; i< itemsToMove.Count; i ++）
 {
 var selectedItem = itemsToMove [i]; 
 int oldIndex = textureListView.Items.IndexOf（（ListViewItem）selectedItem）; 
 int newIndex = textureListView.GetItemAt（e.X，e.Y）.Index; 
 
 textureListView.Items.Remove（（ListViewItem）selectedItem）; 
 textureListView.Items.Insert（newIndex，（ListViewItem）selectedItem）; 
 //textureListView.Items[newIndex].Selected = true; 
} 
 * / 
} 
 private void textureListView_DragDrop（object sender，DragEventArgs e）
 {
 for（int i = 0; i< itemsToMove .Count; i ++）
 {
 var selectedItem = itemsToMove [i]; 
 int oldIndex = textureListView.Items.IndexOf（（ListViewItem）selectedItem）; 
 int newIndex = textureListView.GetItemAt（e.X，e.Y）.Index; 
 
 textureListView.Items.Remove（（ListViewItem）selectedItem）; 
 textureListView.Items.Insert（newIndex，（ListViewItem）selectedItem）; 
 //textureListView.Items[newIndex].Selected = true; 
} 
} 

解决方案

确保"AllowDrop"首先设置为true;

尝试此代码。

 // 3.拖放操作时触发完成了。 
 private void textureListView_DragDrop（object sender，DragEventArgs e）
 {
 ListView.SelectedListViewItemCollection items = e.Data.GetData（typeof（ListView.SelectedListViewItemCollection））ListView.SelectedListViewItemCollection; 
 foreach（项目中的ListViewItem项目）
 {
（（ListView）（发送者））。Items.Add（item.Text）; 
 
 textureListView.Items.Remove（textureListView.SelectedItems [0]）; 
} 
} 
 // 2。将项目拖动到ListView控件的区域时触发。 
 private void textureListView_DragEnter（object sender，DragEventArgs e）
 {
 
 if（e.Data.GetDataPresent（typeof（ListView.SelectedListViewItemCollection）））
 e.Effect = DragDropEffects.Move; 
 else 
 e.Effect = DragDropEffects.None; 
} 
 // 1。当用户在ListView上拖动Item时会触发它。 
 private void textureListView_ItemDrag（object sender，ItemDragEventArgs e）
 {
 textureListView.DoDragDrop（textureListView.SelectedItems，DragDropEffects.Move）; 
} 

最好的问候，

Bob

hey I was just wondering why winforms doesn't like my code?

it seems to give me a no curser sign when I try to drag and drop..

        private void textureListView_ItemDrag(object sender, ItemDragEventArgs e)
        {
            itemsToMove = (from object item in textureListView.SelectedItems select item).ToList();
            numItems = textureListView.Items.Count;
            textureListView.DoDragDrop(e.Item, DragDropEffects.None);


        }
        private void textureListView_DragEnter(object sender, DragEventArgs e)
        {

            e.Effect = DragDropEffects.None;
            /*
            for (int i = 0; i < itemsToMove.Count; i++)
            {
                var selectedItem = itemsToMove[i];
                int oldIndex = textureListView.Items.IndexOf((ListViewItem)selectedItem);
                int newIndex = textureListView.GetItemAt(e.X, e.Y).Index;

                textureListView.Items.Remove((ListViewItem)selectedItem);
                textureListView.Items.Insert(newIndex, (ListViewItem)selectedItem);
                //textureListView.Items[newIndex].Selected = true;
            }
            */
        }
        private void textureListView_DragDrop(object sender, DragEventArgs e)
        {
            for (int i = 0; i < itemsToMove.Count; i++)
            {
                var selectedItem = itemsToMove[i];
                int oldIndex = textureListView.Items.IndexOf((ListViewItem)selectedItem);
                int newIndex = textureListView.GetItemAt(e.X, e.Y).Index;

                textureListView.Items.Remove((ListViewItem)selectedItem);
                textureListView.Items.Insert(newIndex, (ListViewItem)selectedItem);
                //textureListView.Items[newIndex].Selected = true;
            }
        }

解决方案

Hi,

Ensure that "AllowDrop" is set to true first;

Try this code.

//3.Triggered when the drag-and-drop operation is complete. 
private void textureListView_DragDrop(object sender, DragEventArgs e)
        {
            ListView.SelectedListViewItemCollection items = e.Data.GetData(typeof(ListView.SelectedListViewItemCollection)) as ListView.SelectedListViewItemCollection;
            foreach (ListViewItem item in items)
            {
                ((ListView)(sender)).Items.Add(item.Text);

                textureListView.Items.Remove(textureListView.SelectedItems[0]);
            }
        }
        //2. triggered when the item is dragged to the region of the ListView control.
        private void textureListView_DragEnter(object sender, DragEventArgs e)
        {

            if (e.Data.GetDataPresent(typeof(ListView.SelectedListViewItemCollection)))
                e.Effect = DragDropEffects.Move;
            else
                e.Effect = DragDropEffects.None;
        }
        //1. It is triggered when the user is dragging the Item on the ListView.
        private void textureListView_ItemDrag(object sender, ItemDragEventArgs e)
        { 
            textureListView.DoDragDrop(textureListView.SelectedItems, DragDropEffects.Move);
        }

Best Regards,

Bob

这篇关于列表视图不允许我使用当前代码拖放的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！