从定时器内调度任务/方法

发布于 2024-10-18 17:56:54 字数 480 浏览 4 评论 0原文

我想在 Windows 服务中每小时一次转换一个方法。我想使用一个轮询计时器，而不是添加“Windows 任务”。

在计时器回调中，我通过以下代码检查是否调用该方法，其中_config.PollingInterval是计时器的时间间隔。

if (DateTime.Now.Subtract(new DateTime(DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, DateTime.Now.Hour, 0, 0)) < TimeSpan.FromMilliseconds(_config.PollingInterval)) {
    SendReport();
}

由于某种原因，该条件在同一分钟内满足两次（例如 08:00）。我猜想某个地方存在逻辑错误，因为可以保证只有一个计时器。

对于可行的甚至完全不同/更优雅的方法有什么提示吗？

原文

From within a Windows service I would like to cast a method once an hour. A polling timer exists which I would like to use rather than adding a "Windows Task".

In the timer callback, I am checking whether to call the method or not by the following code, where _config.PollingInterval is the interval of the timer.

if (DateTime.Now.Subtract(new DateTime(DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, DateTime.Now.Hour, 0, 0)) < TimeSpan.FromMilliseconds(_config.PollingInterval)) {
    SendReport();
}

For some reason, the condition is met twice within the same minute (e.g. 08:00). I guess there is a logical error somewhere, since it's assured that there is only one timer.

Any hints for a working or even completely different/more elegant approach?

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我ぃ本無心為│何有愛 2024-10-25 17:56:54

也许是这样的：

class Reporter
{
    int _HourLastRun;

    public Reporter()
    {
        _HourLastRun = -1;
    }

    public void SendIfNeeded()
    {
        var currentHour = DateTime.Now.Hour;

        if(currentHour != _HourLastRun)
        {
            _HourLastRun = currentHour;
            SendReport();
        }
    }
}

然后只需在创建计时器的地方实例化此类，并将 SendIfNeeded() 放入计时器的回调中。

maybe something like this:

class Reporter
{
    int _HourLastRun;

    public Reporter()
    {
        _HourLastRun = -1;
    }

    public void SendIfNeeded()
    {
        var currentHour = DateTime.Now.Hour;

        if(currentHour != _HourLastRun)
        {
            _HourLastRun = currentHour;
            SendReport();
        }
    }
}

Then simply instantiate this class where you create your timer and put the SendIfNeeded() into the callback of the timer.

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