.Net - C# 如何判断程序里某个窗体是否为Windows的当前活动窗体？(附代码)

 private void timer1_Tick(object sender, EventArgs e)
        {
            foreach (Form f in Application.OpenForms)
            {
                Console.WriteLine("Name: " + f.Name + " Focused:" + f.Focused);

                Console.WriteLine("is activted? " + ((Form.ActiveForm == f) ? "true" : "false"));

            }

        }