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 Form12 : Form

    {

        public enum RunState

        {

            running,

            pause,

            stop

        }

        private int i = 0;

        RunState state = RunState.stop;  

        public Form12()

        {

            InitializeComponent();

        }

        private void RunProc(object sender, EventArgs e)//执行的部分   

        {

            timer1.Enabled = false;

            if (state == RunState.running)

            {

                label1.Refresh();

                label1.Text = "";

                label1.Text = i.ToString();

                label1.Refresh();

                i++;

                timer1.Enabled = true;

            }

        }

        private void button1_Click(object sender, EventArgs e)

        {

            if (this.button1.Text == "开始")

            {

                this.button1.Enabled = false;

                this.button2.Enabled = true;

                this.button3.Enabled = true;

                timer1.Tick += new EventHandler(RunProc);

                timer1.Enabled = true;

                this.state = RunState.running;

            }  

        }

        private void button2_Click(object sender, EventArgs e)

        {

            if (this.button2.Text == "暂停")

            {

                timer1.Enabled = false;

                state = RunState.pause;

                this.button2.Text = "继续";

            }

            else

            {

                timer1.Enabled = true;

                this.state = RunState.running;

                this.button2.Text = "暂停";

                this.button2.Enabled = true;

                //timer1.Start();   

            }  

        }

        private void button3_Click(object sender, EventArgs e)

        {

            this.timer1.Enabled = false;

            this.i = 0;

            this.label1.Text = "0";

            this.state = RunState.stop;

            this.button1.Text = "开始";

            this.button1.Enabled = true;

            this.button2.Text = "暂停";

            this.button2.Enabled = false;

            this.button3.Enabled = false;  

        }

        private void Form12_Load(object sender, EventArgs e)

        {

            this.label1.Text = "0";

            this.button2.Enabled = false;

            this.button3.Enabled = false;

        }

    }

}