Answers:
通常的WPF计时器是DispatcherTimer,它不是控件,而是在代码中使用。它的工作原理基本上与WinForms计时器相同:
System.Windows.Threading.DispatcherTimer dispatcherTimer = new System.Windows.Threading.DispatcherTimer();
dispatcherTimer.Tick += dispatcherTimer_Tick;
dispatcherTimer.Interval = new TimeSpan(0,0,1);
dispatcherTimer.Start();
private void dispatcherTimer_Tick(object sender, EventArgs e)
{
  // code goes here
}
              var timer = new DispatcherTimer { Interval = TimeSpan.FromSeconds(1) };
                    使用Dispatcher,您将需要包括
using System.Windows.Threading;
还要注意,如果右键单击DispatcherTimer并单击“解析”,则应添加适当的引用。
计时器具有特殊功能。
如果使用StartAsync ()或Start (),则该线程不会阻止用户界面元素
     namespace UITimer
     {
        using thread = System.Threading;
        public class Timer
        {
        public event Action<thread::SynchronizationContext> TaskAsyncTick;
        public event Action Tick;
        public event Action AsyncTick;
        public int Interval { get; set; } = 1;
        private bool canceled = false;
        private bool canceling = false;
        public async void Start()
        {
            while(true)
            {
                if (!canceled)
                {
                    if (!canceling)
                    {
                        await Task.Delay(Interval);
                        Tick.Invoke();
                    }
                }
                else
                {
                    canceled = false;
                    break;
                }
            }
        }
        public void Resume()
        {
            canceling = false;
        }
        public void Cancel()
        {
            canceling = true;
        }
        public async void StartAsyncTask(thread::SynchronizationContext 
        context)
        {
                while (true)
                {
                    if (!canceled)
                    {
                    if (!canceling)
                    {
                        await Task.Delay(Interval).ConfigureAwait(false);
                        TaskAsyncTick.Invoke(context);
                    }
                    }
                    else
                    {
                        canceled = false;
                        break;
                    }
                }
        }
        public void StartAsync()
        {
            thread::ThreadPool.QueueUserWorkItem((x) =>
            {
                while (true)
                {
                    if (!canceled)
                    {
                        if (!canceling)
                        {
                            thread::Thread.Sleep(Interval);
                    Application.Current.Dispatcher.Invoke(AsyncTick);
                        }
                    }
                    else
                    {
                        canceled = false;
                        break;
                    }
                }
            });
        }
        public void StartAsync(thread::SynchronizationContext context)
        {
            thread::ThreadPool.QueueUserWorkItem((x) =>
            {
                while(true)
                 {
                    if (!canceled)
                    {
                        if (!canceling)
                        {
                            thread::Thread.Sleep(Interval);
                            context.Post((xfail) => { AsyncTick.Invoke(); }, null);
                        }
                    }
                    else
                    {
                        canceled = false;
                        break;
                    }
                }
            });
        }
        public void Abort()
        {
            canceled = true;
        }
    }
     }