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2018 年 5 月 10 日更新。orhtej2 建议我的问题可能是确定使用 ContextMenuStrip 的控件是什么。这几乎是一个重复,但我的情况有一个显着的不同。有关详细信息,请参阅我修改后的问题和我的答案。

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。

现在,当我右键单击两个子节点之一时,将单击的if语句TreeView1_NodeMouseClick加载TreeNode到全局treeViewClickedNode TreeNode对象中。然后,当我左键单击两者之一时contextMenuStripChildNode ToolStripMenuItem,该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.

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:我在设计器中做的唯一一件事就是放置treeview1在 上Form1,将其停靠到Form1并将“treeview1”设置NodeMouseClickTreeView1_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
            }
        }
    }
}
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1 回答 1

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SO问题的For a ContextMenuStrip答案部分确定使用ContextMenuStrip的控件 几乎可以回答我的问题。

但是,在我的情况下,我想处理ContextMenuStrip项目右键单击并在更改时访问ContextMenuStrip项目,因此我的代码使用项目事件方法而不是项目事件方法。因此,我需要将发件人转换为 a而不是 a 。除此之外,我使用来自 SO 问题的部分答案确定 ContextMenuStrip在我的事件方法中使用的控件:CheckStateCheckStateContextMenuStrip_CheckStateChangedContextMenuStrip_ClickToolStripMenuItemToolStripItemFor a ContextMenuStripDocumentActionToolStripMenuItem_CheckStateChanged

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
        }
    }

}
于 2018-05-10T12:58:32.553 回答