timer和dispatchertimer功能效果完全一样对吗
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参考技术A DispatcherTimer类位于System.Windows.Threading命名空间下,类似于winform的Timer类。DispatcherTimer timer = new DispatcherTimer();
timer.Interval = TimeSpan.FromSeconds(1);
timer.Tick += new EventHandler(timer_Tick);
void timer_Tick(object sender, EventArgs e)
tb.Text = DateTime.Now.ToLongTimeString();
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C# 计时器用法(DispatcherTimerSystem.Timers.TimerSystem.Threading.Timer)
首先,我觉得三种计时器最大的区别是:DispatcherTimer触发的内容会直接转到主线程去执行(耗时操作会卡住主线程),另外两个则是在副线程执行,如果需要修改界面,则需要手动转到主线程。
DispatcherTimer:
DispatcherTimer _timer; public void TestDispatcherTimer() _timer = new DispatcherTimer(); _timer.Interval = TimeSpan.FromSeconds(1); _timer.Tick += _timer_Tick; _timer.Start(); private void _timer_Tick(object sender, EventArgs e) try Trace.WriteLine("Test DispatcherTimer"); _timer.Stop(); catch (Exception ex) Trace.WriteLine("Error"); _timer.Stop(); _timer.Start();
System.Timers.Timer:
System.Timers.Timer _timer; public void TestTimersTimer() _timer = new System.Timers.Timer(); _timer.Interval = 1000; //单位毫秒 _timer.Elapsed += new System.Timers.ElapsedEventHandler(_timer_Elapsed); _timer.Start(); private void _timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e) try Trace.WriteLine("Test System.Timers.Timer"); #region 此处展示的是把副线程的内容转到主线程 System.Windows.Application.Current.Dispatcher.Invoke( new Action(() => Trace.WriteLine("同步切换"); )); System.Windows.Application.Current.Dispatcher.BeginInvoke( new Action(() => Trace.WriteLine("异步切换"); )); #endregion _timer.Stop(); catch (Exception ex) Trace.WriteLine("Error"); _timer.Stop(); _timer.Start();
System.Threading.Timer:
System.Threading.Timer _timer; private void TeseThreadingTimer() _timer = new System.Threading.Timer(new System.Threading.TimerCallback(Out), null, 0, 1000); //各参数意思详见:https://docs.microsoft.com/zh-cn/dotnet/api/system.threading.timer?redirectedfrom=MSDN&view=netframework-4.8 private void Out(object sender) try Trace.WriteLine("Test System.Threading.Timer"); catch (Exception ex) Trace.WriteLine("Error"); private void Stop() _timer.Dispose();
此处个人无关记载:Environment.TickCount
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C# 计时器用法(DispatcherTimerSystem.Timers.TimerSystem.Threading.Timer)