通过工具tripmenuitem事件处理程序获取控件（treeView）

|| 与此问题类似： 从toolstripmenuitem获取contextmenustrip 除了现在，我需要找到单击“ 0”时打开上下文菜单的对象。 
SourceControl
，
Parent
，
Owner
和
GetParentControl()
都返回null。 最初我有一个
TreeView
，并且设置了它的
ContextMenuStrip
属性。 这是我的初步代码： 
        ToolStripMenuItem tsmi = (ToolStripMenuItem)sender;
        ToolStripMenuItem tsmip = (ToolStripMenuItem)tsmi.OwnerItem;
        ContextMenuStrip cms = (ContextMenuStrip)tsmip.GetCurrentParent();
        TreeView tv = (TreeView)cms.SourceControl; 
        // returns null, but not in the cms_openHandler
        tv.Nodes.Add(new TreeNode(\"event fired.\"));
我不正确地得到6英镑吗？为什么cms的
SourceControl
属性在OpenHandler中起作用，而不是在
ToolStripMenuItem
事件处理程序中起作用？ Form1.Designer.cs： 
namespace TestWFA
{
partial class Form1
{
    /// <summary>
    /// Required designer variable.
    /// </summary>
    private System.ComponentModel.IContainer components = null;

    /// <summary>
    /// Clean up any resources being used.
    /// </summary>
    /// <param name=\"disposing\">true if managed resources should be disposed; otherwise, false.</param>
    protected override void Dispose(bool disposing)
    {
        if (disposing && (components != null))
        {
            components.Dispose();
        }
        base.Dispose(disposing);
    }

    #region Windows Form Designer generated code

    /// <summary>
    /// Required method for Designer support - do not modify
    /// the contents of this method with the code editor.
    /// </summary>
    private void InitializeComponent()
    {
        this.components = new System.ComponentModel.Container();
        this.treeView1 = new System.Windows.Forms.TreeView();
        this.contextMenuStrip1 = new System.Windows.Forms.ContextMenuStrip(this.components);
        this.expandToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
        this.childrenToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
        this.allDescendantsToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
        this.collapseToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
        this.childrenToolStripMenuItem1 = new System.Windows.Forms.ToolStripMenuItem();
        this.parentToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
        this.childrenToolStripMenuItem2 = new System.Windows.Forms.ToolStripMenuItem();
        this.allDescendantsToolStripMenuItem1 = new System.Windows.Forms.ToolStripMenuItem();
        this.contextMenuStrip1.SuspendLayout();
        this.SuspendLayout();
        // 
        // treeView1
        // 
        this.treeView1.ContextMenuStrip = this.contextMenuStrip1;
        this.treeView1.Location = new System.Drawing.Point(64, 75);
        this.treeView1.Name = \"treeView1\";
        this.treeView1.Size = new System.Drawing.Size(262, 247);
        this.treeView1.TabIndex = 0;
        // 
        // contextMenuStrip1
        // 
        this.contextMenuStrip1.Items.AddRange(new System.Windows.Forms.ToolStripItem[] {
        this.expandToolStripMenuItem,
        this.collapseToolStripMenuItem});
        this.contextMenuStrip1.Name = \"contextMenuStrip1\";
        this.contextMenuStrip1.Size = new System.Drawing.Size(153, 70);
        this.contextMenuStrip1.Opening += new System.ComponentModel.CancelEventHandler(this.contextMenuStrip1_Opening);
        // 
        // expandToolStripMenuItem
        // 
        this.expandToolStripMenuItem.DropDownItems.AddRange(new System.Windows.Forms.ToolStripItem[] {
        this.childrenToolStripMenuItem,
        this.allDescendantsToolStripMenuItem});
        this.expandToolStripMenuItem.Name = \"expandToolStripMenuItem\";
        this.expandToolStripMenuItem.Size = new System.Drawing.Size(152, 22);
        this.expandToolStripMenuItem.Text = \"Expand\";
        // 
        // childrenToolStripMenuItem
        // 
        this.childrenToolStripMenuItem.Name = \"childrenToolStripMenuItem\";
        this.childrenToolStripMenuItem.Size = new System.Drawing.Size(161, 22);
        this.childrenToolStripMenuItem.Text = \"Children\";
        this.childrenToolStripMenuItem.Click += new System.EventHandler(this.childrenToolStripMenuItem_Click);
        // 
        // allDescendantsToolStripMenuItem
        // 
        this.allDescendantsToolStripMenuItem.Name = \"allDescendantsToolStripMenuItem\";
        this.allDescendantsToolStripMenuItem.Size = new System.Drawing.Size(161, 22);
        this.allDescendantsToolStripMenuItem.Text = \"All Descendants\";
        this.allDescendantsToolStripMenuItem.Click += new System.EventHandler(this.allDescendantsToolStripMenuItem_Click);
        // 
        // collapseToolStripMenuItem
        // 
        this.collapseToolStripMenuItem.DropDownItems.AddRange(new System.Windows.Forms.ToolStripItem[] {
        this.childrenToolStripMenuItem1,
        this.parentToolStripMenuItem,
        this.childrenToolStripMenuItem2,
        this.allDescendantsToolStripMenuItem1});
        this.collapseToolStripMenuItem.Name = \"collapseToolStripMenuItem\";
        this.collapseToolStripMenuItem.Size = new System.Drawing.Size(152, 22);
        this.collapseToolStripMenuItem.Text = \"Collapse\";
        // 
        // childrenToolStripMenuItem1
        // 
        this.childrenToolStripMenuItem1.Name = \"childrenToolStripMenuItem1\";
        this.childrenToolStripMenuItem1.Size = new System.Drawing.Size(161, 22);
        this.childrenToolStripMenuItem1.Text = \"All Ancestors\";
        this.childrenToolStripMenuItem1.Click += new System.EventHandler(this.childrenToolStripMenuItem1_Click);
        // 
        // parentToolStripMenuItem
        // 
        this.parentToolStripMenuItem.Name = \"parentToolStripMenuItem\";
        this.parentToolStripMenuItem.Size = new System.Drawing.Size(161, 22);
        this.parentToolStripMenuItem.Text = \"Parent\";
        this.parentToolStripMenuItem.Click += new System.EventHandler(this.parentToolStripMenuItem_Click);
        // 
        // childrenToolStripMenuItem2
        // 
        this.childrenToolStripMenuItem2.Name = \"childrenToolStripMenuItem2\";
        this.childrenToolStripMenuItem2.Size = new System.Drawing.Size(161, 22);
        this.childrenToolStripMenuItem2.Text = \"Children\";
        this.childrenToolStripMenuItem2.Click += new System.EventHandler(this.childrenToolStripMenuItem2_Click);
        // 
        // allDescendantsToolStripMenuItem1
        // 
        this.allDescendantsToolStripMenuItem1.Name = \"allDescendantsToolStripMenuItem1\";
        this.allDescendantsToolStripMenuItem1.Size = new System.Drawing.Size(161, 22);
        this.allDescendantsToolStripMenuItem1.Text = \"All Descendants\";
        this.allDescendantsToolStripMenuItem1.Click += new System.EventHandler(this.allDescendantsToolStripMenuItem1_Click);
        // 
        // Form1
        // 
        this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
        this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
        this.ClientSize = new System.Drawing.Size(406, 365);
        this.Controls.Add(this.treeView1);
        this.Name = \"Form1\";
        this.Text = \"Form1\";
        this.contextMenuStrip1.ResumeLayout(false);
        this.ResumeLayout(false);

    }

    #endregion

    private System.Windows.Forms.TreeView treeView1;
    private System.Windows.Forms.ContextMenuStrip contextMenuStrip1;
    private System.Windows.Forms.ToolStripMenuItem expandToolStripMenuItem;
    private System.Windows.Forms.ToolStripMenuItem childrenToolStripMenuItem;
    private System.Windows.Forms.ToolStripMenuItem allDescendantsToolStripMenuItem;
    private System.Windows.Forms.ToolStripMenuItem collapseToolStripMenuItem;
    private System.Windows.Forms.ToolStripMenuItem childrenToolStripMenuItem1;
    private System.Windows.Forms.ToolStripMenuItem parentToolStripMenuItem;
    private System.Windows.Forms.ToolStripMenuItem childrenToolStripMenuItem2;
    private System.Windows.Forms.ToolStripMenuItem allDescendantsToolStripMenuItem1;
}
}
Form1.cs： 
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace TestWFA
{
public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        treeView1.Nodes.Add(new TreeNode(\"root\"));
    }

    private void childrenToolStripMenuItem1_Click(object sender, EventArgs e)
    {
        TreeView tv = GetSourceControl(sender) as TreeView;

        if (tv != null)
        {
            tv.Nodes.Add(\"Tree event catched!\");
        }

        /*ToolStripMenuItem tsmi = (ToolStripMenuItem)sender;
        ToolStripMenuItem tsmip = (ToolStripMenuItem)tsmi.OwnerItem;


        ContextMenuStrip cms = (ContextMenuStrip)tsmip.GetCurrentParent();
        ToolStrip ts = tsmip.GetCurrentParent();

        IContainer c = cms.Container;
        TreeView tv = (TreeView)c;
        tv.Nodes.Add(new TreeNode(\"event fired.\"));*/
    }

    private object GetSourceControl(object Sender)
    {
        if (Sender as ContextMenuStrip != null)
        {
            return ContextMenuStrip.SourceControl;
        }

        var item = Sender as ToolStripItem;

        // move to root item
        while (item.OwnerItem != null)
        {
            item = item.OwnerItem;
        }

        // we have root item now, so lets take ContextMenuStrip object
        var menuObject = item.Owner as ContextMenuStrip;

        if (menuObject != null)
        {
            return menuObject.SourceControl;
        }

        return null;

    }

    private void parentToolStripMenuItem_Click(object sender, EventArgs e)
    {

    }

    private void childrenToolStripMenuItem2_Click(object sender, EventArgs e)
    {

    }

    private void allDescendantsToolStripMenuItem1_Click(object sender, EventArgs e)
    {

    }

    private void childrenToolStripMenuItem_Click(object sender, EventArgs e)
    {

    }

    private void allDescendantsToolStripMenuItem_Click(object sender, EventArgs e)
    {
    }

    private void contextMenuStrip1_Opening(object sender, CancelEventArgs e)
    {
        try
        {
            ContextMenuStrip cms = (ContextMenuStrip)sender;

        }
        catch
        {
        }
        try
        {
            TreeView tv = (TreeView)sender;
        }
        catch
        {
        }
    }

}
}
Program.cs： 
using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;

namespace TestWFA
{
static class Program
{
    /// <summary>
    /// The main entry point for the application.
    /// </summary>
    [STAThread]
    static void Main()
    {
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        Application.Run(new Form1());
    }
}
}
不幸的是，我不知道任何上传文件的方式。我尝试将其上传为img，但没有用。     
2020-02-02 2 条评论
分享

没有找到相关结果

    已邀请:

    凰葱崎济邯

            假设您已将ContextMenuStrip设置为TreeView。您可以轻松地控制
    ContextMenuStrip
    从
    Opened
    处理程序触发了哪个菜单： 
    private void contextMenuStrip1_Opened(object sender, EventArgs e)
{
  TreeView tv = (sender as ContextMenuStrip).SourceControl as TreeView;
  tv.Nodes.Add(\"Tree event catched!\");
}
    如果将ContextMenuStrip设置为treeView \的项目，则此代码也将起作用。 PS：在实际应用中，由于可能会出现空指针，因此不应使用
    (sender as ContextMenuStrip).SourceControl as TreeView;
    这样的构造。您应该在每次强制转换之后检查null。 [编辑] 好，现在我明白你的目标了。 当您处理菜单项
    sender
    时，对象指向项目触发的事件。为了找出弹出了上下文菜单的控件，您应该做三件事： 查找根项目。被点击的项目很可能是另一个项目的子项目，甚至更深。 从根项目中，您应该找到ContextMenuStrip对象 很容易从ContextMenuStrip的
    SourceControl
    属性中找到有趣的控件 我编写了简单的方法来完成所有工作： 
    /// <summary>
/// Gets controls for context menu
/// </summary>
/// <param name=\"Sender\">Sender object from menu event handler</param>
/// <returns></returns>
private object GetSourceControl(Object Sender)
{
  // ContextMenuStrip sended?
  if (Sender as ContextMenuStrip != null)
  {
    ContextMenuStrip cms = Sender as ContextMenuStrip;
    return cms.SourceControl;
  }

  var item = Sender as ToolStripItem;

  // move to root item
  while (item.OwnerItem != null)
  {
    item = item.OwnerItem;
  }

  // we have root item now, so lets take ContextMenuStrip object
  var menuObject = item.Owner as ContextMenuStrip;

  if (menuObject != null)
  {
    return menuObject.SourceControl;
  }

  return null;
}
    您可以简单地使用它。例如，我们有菜单项click事件处理程序： 
    private void toolStripMenuItem1_Click(object sender, EventArgs e)
{
  TreeView tv = GetSourceControl(sender) as TreeView;

  if (tv != null)
  {
    tv.Nodes.Add(\"Tree event catched!\");
  }
}
    [EDIT2] 事实证明，这个问题是较早讨论的（ContextMenuStrip的SourceControl在ToolStripMenuItem Click中是Nothing）。单击根项目时，SourceControl属性不为null，但是如果您单击子项，则该属性等于null。因此解决方案是将SourceControl的值存储在以后的地方。我建议在
    Tag
    属性中进行此操作。因此，所有方法将如下所示： 
    private void contextMenuStrip1_Opening(object sender, CancelEventArgs e)
{
  contextMenuStrip1.Tag = (sender as ContextMenuStrip).SourceControl;
}
....

private object GetSourceControl(object Sender)
{
  if (Sender as ContextMenuStrip != null)
  {
    return ContextMenuStrip.SourceControl;
  }

  var item = Sender as ToolStripItem;

  // move to root item
  while (item.OwnerItem != null)
  {
    item = item.OwnerItem;
  }

  // we have root item now, so lets take ContextMenuStrip object
  var menuObject = item.Owner as ContextMenuStrip;

  if (menuObject != null)
  {
    return menuObject.Tag;
  }

  return null;
}
    在链接的问题中，有一个针对私有字段的解决方法，但是Tag属性对我来说是惯用的     
    2020-02-02 0 0
    分享
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