您的问题是如何在TreeView之间进行拖放？
我以为找到一个微软的示例会很容易，但我的快速搜索只找到了“一棵树”的版本。没关系，没有太多的东西。这里有一些基本的东西，非常类似于这个MS示例树视图。项目拖动，但适用于两棵树。

public MainForm()
    {
        InitializeComponent();
        treeViewA.AllowDrop = true;
        treeViewA.ItemDrag += onAnyItemDrag;
        treeViewA.DragDrop += onAnyDragDrop;
        treeViewA.DragOver += onAnyDragOver;

        treeViewB.AllowDrop = true;
        treeViewB.ItemDrag += onAnyItemDrag;
        treeViewB.DragDrop += onAnyDragDrop;
        treeViewB.DragOver += onAnyDragOver;
    }

    private void onAnyItemDrag(object? sender, ItemDragEventArgs e)
    {
        if(sender is TreeView treeView)
        {
            treeView.DoDragDrop(e.Item, DragDropEffects.Move);
        }
    }

    private void onAnyDragOver(object? sender, DragEventArgs e)
    {
        if (sender is TreeView treeView)
        {
            TreeNode
                dragNode = (TreeNode)e.Data.GetData(typeof(TreeNode)),
                dropNode = treeView.GetNodeAt(treeView.PointToClient(new Point(e.X, e.Y)));
            if(ReferenceEquals(dragNode, dropNode)) 
            {
                e.Effect = 0;
                // To Do
                // Can't drop on descendant node either.
            }
            else
            {
                e.Effect = e.AllowedEffect;
            }
        }
    }

    private void onAnyDragDrop(object? sender, DragEventArgs e)
    {
        if (sender is TreeView treeView)
        {
            TreeNode
                dragNode = (TreeNode)e.Data.GetData(typeof(TreeNode)),
                dropNode = treeView.GetNodeAt(treeView.PointToClient(new Point(e.X, e.Y)));
            // Remove from where it is now
            dragNode.Remove();
            if(dropNode == null)
            {
                treeView.Nodes.Add(dragNode);
            }
            else
            {
                dropNode.Nodes.Add(dragNode);
            }
            dragNode.Parent?.Expand();
        }
    }
}

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