在中继器中获取div，而不使用findcontrol

private Control FindControlRecursive(Control root, string id)
{
    if (root.ID == id)
    {
        return root;
    }

    foreach (Control control in root.Controls)
    {
        Control foundControl = FindControlRecursive(control, id);
        if (foundControl != null)
        {
            return foundControl;
        }
    }

    return null;
}

protected void Page_Load(object sender, EventArgs e)
{
    // 获取div控件
    Control divControl = FindControlRecursive(Page, "divId");

    if (divControl != null)
    {
        // 执行相关操作
        // ...
    }
}