Question

与此问题类似： get contextmenustrip from toolstripmenuitem

现在除了现在我需要找到在点击ToolStripMenuItem时打开了上下文菜单的对象。

SourceControl，Parent，Owner和GetParentControl()都返回null。

最初我有一个TreeView，并设置了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."));

我是否ContextMenuStrip不正确？为什么cms的SourceControl属性在OpenHandler中起作用，而不是在ToolStripMenuItem eventhandler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中：

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
        {
        }
    }

}
}

的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());
    }
}
}

不幸的是我不知道上传文件的方法。我尝试将它们作为imgs上传，但是没有用。

Answer 1

假设您已将ContextMenuStrip设置为TreeView。您可以轻松控制Opened的{{1}}处理程序触发的菜单：

ContextMenuStrip

如果ContextMenuStrip设置为treeView的项目，则此代码也可以使用。

PS：在真正的应用程序中，你不应该使用private void contextMenuStrip1_Opened(object sender, EventArgs e) { TreeView tv = (sender as ContextMenuStrip).SourceControl as TreeView; tv.Nodes.Add("Tree event catched!"); }这样的结构，因为可能有空指针。你应该在每次演员之后检查null。

<强> [编辑]
好的，现在我理解你的目标了当您处理菜单项(sender as ContextMenuStrip).SourceControl as TreeView;对象指向项目触发事件时。要找出弹出上下文菜单的控件，您应该做三件事：

查找根项目。很可能，点击的项目是另一个项目或更深层次的子项目。
从根项目中，您应该找到ContextMenuStrip对象
很容易从ContextMenuStrip的sender属性中找到有趣的控件

我写了一个简单的方法来完成所有这些工作：

SourceControl

您可以简单地使用它。例如，我们有菜单项单击事件处理程序：

/// <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;
}

<强> [EDIT2]
事实证明，这个问题很早就被提到了（SourceControl of ContextMenuStrip is Nothing in ToolStripMenuItem Click?）。单击根项时，SourceControl属性不为null，但是如果单击subitem，则它等于null。因此解决方案是将SourceControl的值存储在稍后使用的位置。我建议在private void toolStripMenuItem1_Click(object sender, EventArgs e) { TreeView tv = GetSourceControl(sender) as TreeView; if (tv != null) { tv.Nodes.Add("Tree event catched!"); } }属性中执行此操作。因此所有方法都如下：

Tag

在链接的问题中，有私有字段的解决方法，但Tag属性对我来说是习惯性的

通过toolstripmenuitem eventhandler获取控件（treeView）

1 个答案: