C#动态添加事件处理程序

Question

嗨我有一个简单的问题.这是我的代码:

        XmlDocument xmlData = new XmlDocument();
        xmlData.Load("xml.xml");

        /* Load announcements first */
        XmlNodeList announcements = xmlData.GetElementsByTagName("announcement");

        for (int i = 0; i < announcements.Count; i++)
        {
            ToolStripMenuItem item = new ToolStripMenuItem();

            item.Name = announcements[i].FirstChild.InnerText;
            item.Text = announcements[i].FirstChild.InnerText;

            /* HERE IS WERE I NEED HELP */

            item.Click += new EventHandler();

            this.freedomMenu.Items.AddRange(new System.Windows.Forms.ToolStripItem[] { item });
        }

xml LastChild包含每个公告的信息.我想创建一个单击事件处理程序,当单击列表项时,会显示一个消息框,其中包含数据.我的问题是我不知道如何动态生成事件处理程序来做到这一点:(

Answer 1

尝试:

 /* HERE IS WERE I NEED HELP */

 item.Click += new EventHandler(toolStripClick);

实际处理程序

void toolStripClick(object sender, EventArgs e)
{
     ToolStripItem item = (ToolStripItem)sender;
     MessageBox.Show(item.Text);
}    

Answer 2

您可以使用ToolStripMenuItem的Tag属性:

item.Tag = Announcements[i].LastChild.InnerText;

public void item_click(object sender, EventArgs e)
{
    var menu = sender as ToolStripMenuItem;
    if (menu!= null)
        MessageBox.Show(menu.Tag);
}

或者您可以使用lambda,它将捕获变量:

string data = Announcements[i].LastChild.InnerText;
item.Click += (s, e) => { MessageBox.Show(data); };