winform 用户控件事件的写法

 public partial class UcTest : UserControl

    {

        public UcTest()

        {

            InitializeComponent();

        }

        //定义事件

        public event EventHandler UserControlBtnClicked;

        private void btn_Click(object sender, EventArgs e)

        {

            UserControlBtnClicked?.Invoke(sender, new EventArgs());//把按钮自身作为参数传递

        }

    }