winform跨界面进行的操作

 private void button1_Click(object sender, EventArgs e)
        {
            Form2 f2 = new Form2();
            Action<string> f2CallBack = x =>
              {
                  label1.Text = x;//函数体。要进行的操作
              };//(3)设置与窗体2相同签名的委托
            f2.CallBack = f2CallBack;//(4)对声明委托的窗体进行委托绑定
            f2.Show();

        }
     

       //(1)声明委托
        public Action<string> CallBack;
        private void button1_Click(object sender, EventArgs e)
        {
            //(2)传递参数
            this.CallBack?.Invoke(textBox1.Text);//传递变量值
        }