上下移动树中的节点 [英] Move Node in Tree up or Down

问题描述

在树状视图中上下移动节点的最准确方法是什么.我在每个节点上都有一个上下文菜单，应该将所选节点及其所有子节点一起移动.

What is the most accurate way to move a node up and down in a treeview. I got a context menu on each node and the selected node should be moved with all its subnodes.

我正在使用C#.Net 3.5 WinForms

I'm using C# .Net 3.5 WinForms

推荐答案

您可以使用以下扩展名:

You can use the following extensions :

public static class Extensions
{
    public static void MoveUp(this TreeNode node)
    {
        TreeNode parent = node.Parent;
        TreeView view = node.TreeView;
        if (parent != null)
        {
            int index = parent.Nodes.IndexOf(node);
            if (index > 0)
            {
                parent.Nodes.RemoveAt(index);
                parent.Nodes.Insert(index - 1, node);
            }
        }
        else if (node.TreeView.Nodes.Contains(node)) //root node
        {
            int index = view.Nodes.IndexOf(node);
            if (index > 0)
            {
                view.Nodes.RemoveAt(index);
                view.Nodes.Insert(index - 1, node);
            }
        }
    }

    public static void MoveDown(this TreeNode node)
    {
        TreeNode parent = node.Parent;
        TreeView view = node.TreeView;
        if (parent != null)
        {
            int index = parent.Nodes.IndexOf(node);
            if (index < parent.Nodes.Count -1)
            {
                parent.Nodes.RemoveAt(index);
                parent.Nodes.Insert(index + 1, node);
            }
        }
        else if (view != null && view.Nodes.Contains(node)) //root node
        {
            int index = view.Nodes.IndexOf(node);
            if (index < view.Nodes.Count - 1)
            {
                view.Nodes.RemoveAt(index);
                view.Nodes.Insert(index + 1, node);
            }
        }
    }
}

子节点将跟随其父节点.

Child nodes will follow their parents.

添加了以下情况:要移动的节点是TreeView中的根.

Added case that node to move is a root in the TreeView.

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