C# 如何每5分钟检查一次,并在需要时中断检查?
在MainPage.xaml.cs中,我创建了一个BackgroundWorker。这是我的代码:C# 如何每5分钟检查一次,并在需要时中断检查?,c#,multithreading,windows-phone-7,C#,Multithreading,Windows Phone 7,在MainPage.xaml.cs中,我创建了一个BackgroundWorker。这是我的代码: protected override void OnNavigatedTo(NavigationEventArgs e) { base.OnNavigatedTo(e); bgw = new BackgroundWorker(); bgw.WorkerSupportsCancellation
protected override void OnNavigatedTo(NavigationEventArgs e)
{
base.OnNavigatedTo(e);
bgw = new BackgroundWorker();
bgw.WorkerSupportsCancellation = true;
bgw.DoWork += new DoWorkEventHandler(bgw_DoWork);
bgw.RunWorkerCompleted += new RunWorkerCompletedEventHandler(bgw_RunWorkerCompleted);
bgw.RunWorkerAsync();
}
protected override void OnNavigatedFrom(NavigationEventArgs e)
{
bgw.CancelAsync();
base.OnNavigatedFrom(e);
}
void bgw_DoWork(object sender, DoWorkEventArgs e)
{
if ((sender as BackgroundWorker).CancellationPending)
{
e.Cancel = true;
return;
}
Thread.Sleep(1000*60*5); // 5 minutes
}
void bgw_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
if (e.Cancelled || (sender as BackgroundWorker).CancellationPending)
return;
/* the work thats needed to be done with the ui thread */
(sender as BackgroundWorker).RunWorkerAsync();
}
但这是行不通的。导航到另一页时,如何正确停止backgroundworker?创建一个信号,如
ManualResetEvent
ManualResetEvent _evStop = new ManualResetEvent(false);
不要执行Thread.Sleep()
,而是在事件对象上等待所需的“延迟”时间
如果要提前停止处理,请在事件对象上发出信号
_evStop.Set();
当事件发出信号时,您的WaitOne将提前返回。否则,它将在您指定的时间后超时。这听起来可能有点傻,但为什么不改用计时器呢?猜测windows phone的正确计时器是Dispatchermer。
_evStop.Set();