具有动态循环的计时器

Question

我正在尝试编写一个工具，用于每一位x分钟来平某些事情。我有下面的代码来创建我的线程，点击也很好，只是我不知道如何在每次线程中动态地制作一个计时器。数据是一个表格，如：

Id  Name        URL                     Time    Active
1   All good    http://httpstat.us/200  5000    1
2   404         http://httpstat.us/404  2000    1

我的代码如下所示：(我还没有将循环中的变量放入其中)

public void SetupTimers()
{
    DB db = new DB();
    DataTable dtLinks = new DataTable();
    dtLinks = db.GetDataTable(String.Format("SELECT Id, Name, URL, Time, Active FROM Shed WHERE Active = 1"));
    foreach (DataRow row in dtLinks.Rows)
    {
        Thread thread = new Thread(() => SetupShed(1, "WILLBURL", "WILLBENAME"));
        thread.Start();
    }
}

和

static void SetupShed(Int32 Time, String URL, String Name)
{
   /* Heres where I will do the actual ping 
      but I need to setup a timer to loop every x seconds? 
      It's a contiunous check so it'll have to keep looping over. 
      I've redacted the actual ping for this example
   */
}

Answer 1

您可以使用Timer类。您实际上不需要创建自己的线程。计时器类在幕后为您做这件事。

public void SetupTimers()
{
    DB db = new DB();
    DataTable dtLinks = new DataTable();
    dtLinks = db.GetDataTable(String.Format("SELECT Id, Name, URL, Time, Active FROM Shed WHERE Active = 1"));
    foreach (DataRow row in dtLinks.Rows)
    {
        SetupShed(1, "WILLBURL", "WILLBENAME");
    }
}


static void SetupShed(double ms, String url, String name)
{
        System.Timers.Timer timer = new System.Timers.Timer(ms);
        timer.AutoReset = true;
        timer.Elapsed += (sender, e) => Ping(url, name);
        timer.Start();
}

static void Ping(String url, String name)
{
    //do you pinging
}

Answer 2

一种可能的方法是让线程休眠，直到您希望它运行为止。但这可能会导致一些不想要的效果，比如许多执行absolutely......nothing的进程。此外，如果您想结束它们，preliminarily......it将无法工作，如果没有相当多的额外检查(例如，如果您希望它现在结束，那么如果它以5000 milliseconds....so结尾，则需要每10-20毫秒检查一次，.)。

采取最初的方法(注意，时间是以毫秒为单位的)。如果您想在几秒钟内拥有它，那么您需要使用:Thread.Sleep(Time*1000)：

static void SetupShed(Int32 Time, String URL, String Name)
{
   /* Heres where I will do the actual ping 
      but I need to setup a timer to loop every x seconds? 
      It's a contiunous check so it'll have to keep looping over. 
      I've redacted the actual ping for this example
   */

    while (true)
    {
        Thread.Sleep(Time);
        //.....Do my stuff and then loop again.
    }
}