namespace exercise_1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)       /*问题似乎从这里开始，调试断点发现这一条没有被执行，直接跳过了*/
        {
            int i = 2;
            switch (i)
            {
                case 1: MessageBox.Show("一只狗");
                    break;
                case 2: MessageBox.Show("两只狗");
                    break;
                case 3: MessageBox.Show("三只狗");
                    break;
                default: MessageBox.Show("没有狗");
                    break;
            }
        }
    }
}