c# - 这是获得运行异步任务所需时间的最佳方式吗？

Question

我想知道执行我的异步任务需要多长时间，以便我可以改进执行时间。

请看测试方法并指教。测试背景:我想在给定 sAMACcountName 的情况下从 Active Directory 中找出用户帐户管理员。

[TestMethod]
public async Task GetManagerAsync_TestMethod()
{
    // connect to the Active Directory
    var serviceUsers = new User(@"LDAP://XXXXXXXXX", @"USER", "PASSWORD");

    // get the time before the start of operation
    var sTime = DateTime.Now;

    // perform the task
    var task = await serviceUsers.GetManagerAsync(@"sAMAccountName");

    // get the time after the operation
    var eTime = DateTime.Now;

    // get the time span between the start and end time
    TimeSpan taskRunTime = eTime - sTime;

    System.Diagnostics.Debug.WriteLine("Operation took {0} seconds", taskRunTime.TotalSeconds);

    Assert.IsNotNull(task);
 }

Answer 1

你应该使用 Stopwatch相反。

var stopwatch = Stopwatch.StartNew();
var task = await serviceUsers.GetManagerAsync(@"sAMAccountName");
stopwatch.Stop();

var elapsed = stopwatch.Elapsed;

它不仅在语义上更正确，而且更准确:

If the installed hardware and operating system support a high-resolution performance counter, then the Stopwatch class uses that counter to measure elapsed time. Otherwise, the Stopwatch class uses the system timer to measure elapsed time.