C# 测试代码段性能耗时

?一：?

????????????DateTime BeginTime = System.DateTime.Now;
??????????? //代码
??????????? DateTime EndTime = System.DateTime.Now;
??????????? TimeSpan ts = EndTime.Subtract(BeginTime);
??????????? MessageBox.Show(ts.TotalMilliseconds.ToString());

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二：

??????????? System.Diagnostics.Stopwatch watch = new System.Diagnostics.Stopwatch();
??????????? watch.Reset();
??????????? watch.Start();
??????????? //代码
??????????? watch.Stop();
??????????? MessageBox.Show(watch.ElapsedMilliseconds.ToString());