c#中Stopwatch计时器的使用

        private void button3_Click(object sender, EventArgs e)
        {
            Stopwatch sw = new Stopwatch();
            sw.Start();
            Thread.Sleep(3000);
            sw.Stop();
            MessageBox.Show(sw.ElapsedMilliseconds.ToString());
            sw.Start();
            Thread.Sleep(3000);
            sw.Stop();
            MessageBox.Show(sw.ElapsedMilliseconds.ToString());
        }

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