这是获得运行异步任务所需时间的最佳方法吗？

Question

我想知道执行异步任务需要多长时间,以便我可以改进执行时间.

请看一下测试方法并提出建议.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器.

[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

你应该使用一个Stopwatch代替.

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:

如果安装的硬件和操作系统支持高分辨率性能计数器,则Stopwatch类使用该计数器来测量经过的时间.否则,Stopwatch类使用系统计时器来测量经过的时间.