为什么ToolStripMenuItem.Click事件处理程序显示相同的内容？

private void menuItem1_Click(object sender, EventArgs e)
{
    // 处理 menuItem1 的点击事件
    MessageBox.Show("MenuItem1 被点击");
}

private void menuItem2_Click(object sender, EventArgs e)
{
    // 处理 menuItem2 的点击事件
    MessageBox.Show("MenuItem2 被点击");
}

menuItem1.Click += new EventHandler(menuItem1_Click);
menuItem2.Click += new EventHandler(menuItem2_Click);

private void menuItem_Click(object sender, EventArgs e)
{
    ToolStripMenuItem clickedItem = sender as ToolStripMenuItem;
    if (clickedItem != null)
    {
        switch (clickedItem.Name)
        {
            case "menuItem1":
                MessageBox.Show("MenuItem1 被点击");
                break;
            case "menuItem2":
                MessageBox.Show("MenuItem2 被点击");
                break;
            // 其他菜单项的处理逻辑
        }
    }
}

menuItem1.Click += new EventHandler(menuItem_Click);
menuItem2.Click += new EventHandler(menuItem_Click);

private void menuItem_Click(object sender, EventArgs e)
{
    ToolStripMenuItem clickedItem = sender as ToolStripMenuItem;
    if (clickedItem != null)
    {
        label1.Text = $"当前点击的菜单项是: {clickedItem.Text}";
    }
}