紅綠燈(2)

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        Timer t = new Timer();
        int count;
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            t.Interval = 1000;
            t.Enabled = false;
            t.Tick += new EventHandler(Timer_Tick);
        }
       
        private void button1_Click(object sender, EventArgs e)
        {
            t.Start();
            count = 0;
        }
        public void Timer_Tick(object sender, EventArgs eArgs)
        {
            count = count % 3 + 1;
            switch (count)
            {
                case 1:
                    pictureBox1.Visible = true;
                    pictureBox2.Visible = false;
                    pictureBox3.Visible = false;
                    pictureBox4.Visible = false;
                    pictureBox5.Visible = false;
                    pictureBox6.Visible = false;
                    pictureBox7.Visible = false;
                    break;
                case 2:
                    pictureBox1.Visible = false;
                    pictureBox2.Visible = true;
                    pictureBox3.Visible = false;
                    pictureBox4.Visible = false;
                    pictureBox5.Visible = false;
                    pictureBox6.Visible = false;
                    pictureBox7.Visible = false;
                    break;
                case 3:
                    pictureBox1.Visible = false;
                    pictureBox2.Visible = false;
                    pictureBox3.Visible = true;
                    pictureBox4.Visible = false;
                    pictureBox5.Visible = false;
                    pictureBox6.Visible = false;
                    pictureBox7.Visible = false;
                    break;

            }
        }
        private void button2_Click(object sender, EventArgs e)
        {
            pictureBox1.Visible = false;
            pictureBox2.Visible = false;
            pictureBox3.Visible = false;
            pictureBox4.Visible = false;
            pictureBox5.Visible = true;
            pictureBox6.Visible = true;
            pictureBox7.Visible = true;
            t.Enabled = false;
        }

    }
}