用 System.Threading.Timer 替换 Thread.Sleep？

Question

我正在尝试将 Thread.Sleep 替换为 System.Threading.Timer，并尝试在以下代码中实现它。更改的主要原因是，即使它在本地测试时可以正常工作，但在服务器中却无法正常工作。另外，我读到在这里使用它是不好的做法。

我看过几个例子（包括下面的一个），但我不确定如何在我的案例中使用它：System.Threading.Timer in C# it seems to be not working. It runs very fast every 3 second

在我的控制台应用程序中，我需要每 15 分钟将文件复制到我们的服务器。所以在 :20, :35, :50, :05，我开始阅读那个季度的文件。在以下情况下，文件将在 :45 可用，我添加 5 分钟以防万一。

这是我的代码。我之前曾尝试并行复制几个季度的文件，但源文件所在的服务器遇到了问题。所以我要回到这个。

我的问题是，在这个例子中如何用 System.Threading.Timer 替换 Thread.Sleep？

我想试试await Task.Delay(Int32)，但是我有VS2010：

DateTime lastTimeRead = new DateTime(2014, 9, 9, 8, 35, 0);  //Last read at 8:35AM
DateTime nextTimeRead; 
for (; ; )
{
    now = DateTime.Now;  //It's currently 8:43AM
    nextTimeRead = LastTimeRead.AddMinutes(15);  // nextTimeRead = 8:50AM.
    if (nextTimeRead > now) //Yes, so wait 7 minutes for files to be available
    {
        TimeSpan span = nextTimeRead.Subtract(now);
        Double milliseconds = span.TotalMilliseconds;
        Console.WriteLine("Sleep for milliseconds: " + milliseconds.ToString());
        Thread.Sleep(Convert.ToInt32(milliseconds));
        Console.WriteLine("Download files after sleep of: " + nextTimeRead.ToString());
        DownloadFilesByPeriod(nextTimeRead);
    }
    else // Files are available. Read.
    {
        Console.WriteLine("Download files no sleep: " + nextTimeRead.ToString());
        DownloadFilesByPeriod(nextTimeRead);
    }
    LastTimeRead = nextTimeRead;
}

Answer 1

这个想法是有一个计时器并在你想在你的程序中设置延迟时启用它：

System.Timers.Timer Delay = new System.Timers.Timer();
Delay.Elapsed += new System.Timers.ElapsedEventHandler(Delay_Elapsed);
Delay.Interval=Convert.ToInt32(milliseconds);
Delay.Enabled = false;

 void Delay_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
  {
    Delay.Enabled = false; 
  }
......
.....
if (nextTimeRead > now) //Yes, so wait 7 minutes for files to be available
    {
        TimeSpan span = nextTimeRead.Subtract(now);
        Double milliseconds = span.TotalMilliseconds;
        Console.WriteLine("Sleep for milliseconds: " + milliseconds.ToString());
        Delay.Enabled = true;
        while (Delay.Enabled)
        {
          ////Wait until time passes
        }
        Console.WriteLine("Download files after sleep of: " + nextTimeRead.ToString());
        DownloadFilesByPeriod(nextTimeRead);
    }