Question

所以我想每秒查看当前select min (case catid when 1 then name end) as catname1 ,min (case catid when 2 then name end) as catname2 from (select row_number () over (partition by catid order by name) as rn ,catid ,name from deemucty.sample12 ) t group by rn order by rn ;，如果time加注seconds == 0并显示当前时间：

event

用法：

using System.Timers;

public delegate void TimeHandler(object sender, TimeEventArgs e);

public class Clock
{
    private Timer timer;
    public event TimeHandler CurrentTime;

    public Clock()
    {
        timer = new Timer();
        timer.Elapsed += timer_Elapsed;
        timer.Interval = 1000;
    }

    public void Start()
    {
        timer.Enabled = true;
        timer.Start();
    }

    private void timer_Elapsed(object sender, ElapsedEventArgs e)
    {
        DateTime time = DateTime.Now;
        int sec = time.Second;
        if (sec == 0)
            if (CurrentTime != null)
                CurrentTime(this, new TimeEventArgs(time));
    }
}

public class TimeEventArgs
{
    public readonly DateTime Time;

    public TimeEventArgs(DateTime time)
    {
        Time = time;
    }
}

但似乎计时器没有启动。

Answer 1

您的timer_Elapsed不匹配currentTime和CurrentTime。如果检查委托，则应使用处理程序的大写名称。

您可以通过在其中设置断点或在开头直接放置日志消息来确保调用Elapsed处理程序。

最后，Clock_CurrentTime每分钟只会调用一次。

定时器无法启动

1 个答案: