c# 测试运行时间毫秒级

 long currentMillis = (DateTime.Now.Ticks - (new DateTime(, , , , , , )).Ticks) / ;
 /*代码*/
 long currentMillis1 = (DateTime.Now.Ticks - (new DateTime(, , , , , , )).Ticks) / ;
 MessageBox.Show((currentMillis1 - currentMillis).ToString());