lock Thread的作用

lock在图形的绘制方面有一定的应用，
特别是当要求结束一个计算后，再进行绘图时，常会将计算的任务用lock, 最后进行绘图

       Thread myThread;
        Thread myThread1;

        public void Add()
        {
              {
                for (int i = 100; i >= 0; i--)
                {
                    Thread.Sleep(200);
                    label1.Text = i.ToString();
                }
            }
        }

        public void Add1()
        {
            {
                for (int j = 0; j <= 30; j++)
                {
                    Thread.Sleep(200);
                    label2.Text = j.ToString();
                }
            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            myThread = new Thread(new ThreadStart(Add));
            myThread1 = new Thread(new ThreadStart(Add1));
            myThread.Start();
            myThread1.Start();
        }

如果没有lock其中的Add 或add1,那么，将动态显示两组数值的变化，
当加上lock后，就会等其中的add或aa1运行结束后，再时行(绘图其它操作)

     Thread myThread;
        Thread myThread1;

        public void Add()
        {
            //lock (this)
            {
                for (int i = 100; i >= 0; i--)
                {
                    Thread.Sleep(200);
                    label1.Text = i.ToString();
                }
            }
        }

        public void Add1()
        {
            lock (this)　　　//Add1结束后，显示Form1,
            {
                for (int j = 0; j <= 30; j++)
                {
                    Thread.Sleep(200);
                    label2.Text = j.ToString();
                }
            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            myThread = new Thread(new ThreadStart(Add));
            myThread1 = new Thread(new ThreadStart(Add1));
            myThread.Start();
            myThread1.Start();
        }