有没有办法知道哪个 TreeNode 在其 ContextMenuStrip 项目之一被左键单击并且项目的 CheckedState 更改后被右键单击？

Question

2018 年 5 月 10 日更新。 orhtej2 建议我的问题可能是Determine what control the ContextMenuStrip was used on 的重复。这是几乎重复，但我的情况有一个显着的差异。有关详细信息，请参阅我修改后的问题和答案。

请参阅下面的代码。我的目标是更清楚地确定哪个 TreeNode 在其 ContextMenuItems 之一被左键单击后被右键单击。

就像现在一样，当我右键单击两个子节点之一时，TreeView1_NodeMouseClick 中的 if 语句会将单击的 TreeNode 加载到全局 treeViewClickedNode TreeNode 对象中。然后，当我左键单击两个contextMenuStripChildNode ToolStripMenuItem 之一时，DocumentActionToolStripMenuItem_CheckStateChanged 方法被触发。然后我可以检查检查状态。如果选中，我可以对 treeViewClickedNode TreeNode 做点什么。

我的问题：有没有一种更简洁的方法来确定在其 ContextMenuStrip 项目之一被左键单击后右键单击哪个 TreeNode，即，有没有办法取消全局变量 treeViewClickedNode？

注意：我在设计器中所做的唯一事情是将treeview1 放在Form1 上，将其停靠到Form1 并将'treeview1' NodeMouseClick 设置为TreeView1_NodeMouseClick

using System;
using System.Windows.Forms;

namespace WindowsFormsApp_Scratch
{
    public partial class Form1 : Form
    {
        TreeNode treeViewClickedNode;
        ContextMenu mnu = new ContextMenu();

        public Form1()        
        {
            InitializeComponent();

            // Create the root node.
            TreeNode treeNodeRoot = new TreeNode("Documents");

            // Add the root node to the TreeView.
            treeView1.Nodes.Add(treeNodeRoot);

            //Create and add child 2 nodes each with a two item ContextMenuStrip.
            string[] childNodeLabels = { "document1.docx", "document2.docx"};
            string[] contextItemLabels = { "Action A", "Action B" };

            foreach (String childNodeLabel in childNodeLabels)
            {
                TreeNode treeNode = treeNodeRoot.Nodes.Add(childNodeLabel);

                // Create a ContextMenuStrip for this child node.
                ContextMenuStrip contextMenuStripChildNode = new ContextMenuStrip
                {
                    ShowCheckMargin = true,
                    ShowImageMargin = false
                };

                foreach (String contextItemLabel in contextItemLabels)
                {
                    //Create a menu item.
                    ToolStripMenuItem action = new ToolStripMenuItem(contextItemLabel, null, DocumentActionToolStripMenuItem_CheckStateChanged)
                    {
                        CheckOnClick = true
                    };

                    contextMenuStripChildNode.Items.Add(action);
                }

                treeNode.ContextMenuStrip = contextMenuStripChildNode;
            }


        private void TreeView1_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
        {
            TreeView t = (TreeView)sender;
            //Force the node that was right-clicked to be selected
            t.SelectedNode = t.GetNodeAt(e.X, e.Y);

            if (e.Button == MouseButtons.Right)
            {
                treeViewClickedNode = e.Node;
            }
        }

        private void DocumentActionToolStripMenuItem_CheckStateChanged(object sender, EventArgs e)
        {
            ToolStripMenuItem toolStripMenuItem = (ToolStripMenuItem)sender;

            if (toolStripMenuItem.CheckState == CheckState.Checked)
            {
                //Do something with treeViewClickedNode object
            }
        }
    }
}

Answer 1

S.O. 答案的For a ContextMenuStrip 部分。 question Determine what control the ContextMenuStrip was used on几乎回答了我的问题。

然而，就我而言，我想处理ContextMenuStrip 项目右键单击并在CheckState 更改时访问CheckState 项目的CheckState，因此我的代码使用ContextMenuStrip 项目_CheckStateChanged事件方法而不是 ContextMenuStrip 项目 _Click 事件方法。因此，我需要将发件人转换为ToolStripMenuItem 而不是ToolStripItem。除此之外，我使用来自 S.O. 的答案的 For a ContextMenuStrip 部分。在我的DocumentActionToolStripMenuItem_CheckStateChanged 事件方法中提问Determine what control the ContextMenuStrip was used on：

private void DocumentActionToolStripMenuItem_CheckStateChanged(object sender, EventArgs e)
{
    Control treeNodeControl;

    ToolStripMenuItem toolStripMenuItem = (ToolStripMenuItem)sender;

    // if the ToolStripMenuItem item is owned by a ContextMenuStrip ...
    if (toolStripMenuItem.Owner is ContextMenuStrip contextMenuStrip)
    {
        // Get the TreeNode that is displaying this context menu
        treeNodeControl = contextMenuStrip.SourceControl;

        if (toolStripMenuItem.CheckState == CheckState.Checked)
        {
            //Do something with treeNodeControl.SelectedNode treeView node
        }
    }

}