c# 检测子窗口是否开启

        /// <summary>
        /// 检测窗口是否开启
        /// </summary>
        /// <param name="sFromClassName">要检测的窗口类名</param>
        /// <returns>返回是否打开,是为打开，并激活被打开的窗口，否未打开</returns>
        private bool CheckFormIsOpen(string sFromClassName)
        {
            foreach (Form childrenForm in this.MdiChildren)
            {
                //检测是不是当前子窗体名称
                if (childrenForm.Name == sFromClassName)
                {
                    //是的话就是把他显示
                    childrenForm.Visible = true;
                    //并激活该窗体
                    childrenForm.Activate();
                    return true;
                }
            }
            return false;
        }