从另一个线程启动/停止DispatcherTimer

using System;
using System.Threading;
using System.Windows.Threading;

public class DispatcherTimerHelper
{
    private readonly DispatcherTimer _timer;
    private readonly Dispatcher _dispatcher;
    private readonly object _lockObject = new object();

    public DispatcherTimerHelper()
    {
        _dispatcher = Dispatcher.CurrentDispatcher;
        _timer = new DispatcherTimer();
        _timer.Tick += Timer_Tick;
    }

    public void StartTimer(TimeSpan interval)
    {
        lock (_lockObject)
        {
            _timer.Interval = interval;
            _timer.Start();
        }
    }

    public void StopTimer()
    {
        lock (_lockObject)
        {
            _timer.Stop();
        }
    }

    private void Timer_Tick(object sender, EventArgs e)
    {
        // Do something on the UI thread
    }
}