Question

我需要帮助。我有Windows服务，我需要在特定时间每小时运行一次这项服务，例如：09：05,10：05,11：05，.... 我的服务现在每小时开始，但从我开始这项服务的每个小时开始。那么我怎样才能实现我的需求呢。

我的代码：

public partial class Service1 : ServiceBase
{
    System.Timers.Timer timer = new System.Timers.Timer();

    public Service1()
    {
        InitializeComponent();
    }

    protected override void OnStart(string[] args)
    {
        this.WriteToFile("Starting Service {0}");

        timer.Elapsed += new ElapsedEventHandler(OnElapsedTime);

        timer.Interval = 60000;

        timer.Enabled = true;
    }

    protected override void OnStop()
    {
        timer.Enabled = false;

        this.WriteToFile("Stopping Service {0}");
    }

    private void OnElapsedTime(object source, ElapsedEventArgs e)
    {
        this.WriteToFile(" interval start {0}");
    } }

Answer 1

您应该检查每个＆＃39; n＆＃39;来自计时器的秒数（例如1）：

public partial class Service1 : ServiceBase
{
    System.Timers.Timer timer = new System.Timers.Timer();

    public Service1()
    {
        InitializeComponent();
    }

    protected override void OnStart(string[] args)
    {
        this.WriteToFile("Starting Service {0}");

        timer.Elapsed += new ElapsedEventHandler(OnElapsedTime);

        timer.Interval = 1000; // 1000 ms => 1 second

        timer.Enabled = true;
    }

    protected override void OnStop()
    {
        timer.Enabled = false;

        this.WriteToFile("Stopping Service {0}");
    }

    private int lastHour = -1;
    private void OnElapsedTime(object source, ElapsedEventArgs e)
    {
        var curTime = DateTime.Now; // Get current time
        if (lastHour != curTime.Hour && curTime.Minute == 5) // If now 5 min of any hour
        {
            lastHour = curTime.Hour;

            // Some action
            this.WriteToFile(" interval start {0}");
        }
    } 
}

Answer 2

以下是另一种计算第一个间隔的方法：

var minutesAfterHourToStart = 5;  // Start at 5 minutes after the hour

var now = DateTime.Now;
var minutesToStart = 60 - (now.Minute - (minutesAfterHourToStart - 1));
if (minutesToStart > 60) minutesToStart -= 60;
var secondsToStart = 60 - now.Second + (minutesToStart * 60);

timer.Interval = TimeSpan.FromSeconds(secondsToStart).TotalMilliseconds;

然后，在OnTimeElapsed事件中，您将设置每小时运行的间隔。为了防止经常反复将变量设置为相同的值，我们可以设置一个我们已设置最终间隔的全局变量：

class MyService
{
    private bool resetInterval = true;

然后我们可以检查这个，并在第一次通过时将其设置为false：

private void OnElapsedTime(object source, ElapsedEventArgs e)
{
    if (resetInterval)
    {
        timer.Interval = TimeSpan.FromHours(1).TotalMilliseconds;
        resetInterval = false;
    }

Answer 3

你只需要以不同的方式启动计时器：

public partial class Service1 : ServiceBase
{
    System.Timers.Timer timer = new System.Timers.Timer();

    public Service1()
    {
        InitializeComponent();
    }

    protected override void OnStart(string[] args)
    {
        this.WriteToFile("Starting Service {0}");

        timer.Elapsed += new ElapsedEventHandler(OnElapsedTime);
        var excess = DateTime.Now.Minute - 5;
        var span = DateTime.Now.AddMinutes(excess <= 0 ? -excess : 60- excess) - DateTime.Now;
        timer.Interval = span.TotalMilliseconds;

        timer.Enabled = true;
    }

    protected override void OnStop()
    {
        timer.Enabled = false;

        this.WriteToFile("Stopping Service {0}");
    }

    private void OnElapsedTime(object source, ElapsedEventArgs e)
    {
        var excess = DateTime.Now.Minute - 5;
        var span = DateTime.Now.AddMinutes(excess <= 0 ? -excess : 60- excess) - DateTime.Now;
        timer.Interval = span.TotalMilliseconds;
        this.WriteToFile(" interval start {0}");
    } 
}

这样你就可以设置第一个＆＃34; x：05＆＃34;分钟，然后每小时。

Answer 4

也许只是保留您的代码，并将您的服务设置为手动启动，然后使用Windows调度程序在特定时刻启动它一次。剩下的工作将做定时器和OnElapse方法; 这可以帮助您：https://stackoverflow.com/a/36309450/5358389

Windows服务在特定分钟内每小时运行一次

4 个答案: