WPF中Timer與DispatcherTimer類的區別

前幾天在WPF中寫了一個軌跡回放的功能，我想稍微做過類似項目的,都曉得采用一個時間控件或者時間對象作為調度器，我在這么做的時候，出現了問題,於是將程序中的Timer換成了DispatchTimer，然后就可以了，特意在網上找了下這兩者的區別，看到一篇比較詳細的，並且有代碼的博文，我就直接引用了，原文地址：http://www.cnblogs.com/zhchbin/archive/2012/03/06/2381693.html，我只附加上原文的代碼。

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Navigation; using System.Windows.Shapes; using System.Timers; namespace TimerTest { /// <summary>
/// Interaction logic for MainWindow.xaml /// </summary>
    public partial class MainWindow : Window { private Timer aTimer = null; public MainWindow() { InitializeComponent(); aTimer = new Timer(); aTimer.Elapsed += new ElapsedEventHandler(OnTimedEvent); // Set the Interval to 5 seconds.
            aTimer.Interval = 1000; aTimer.Enabled = true; aTimer.Start(); } private void OnTimedEvent(object source, ElapsedEventArgs e) { timeLabel.Content = DateTime.Now.ToUniversalTime(); } } }

 

 

using System; using System.Windows; using System.Timers; using System.Windows.Threading; namespace TimerTest { /// <summary>
/// Interaction logic for MainWindow.xaml /// </summary>
    public partial class MainWindow : Window { private Timer aTimer = null; private delegate void TimerDispatcherDelegate(); public MainWindow() { InitializeComponent(); aTimer = new Timer(1000); aTimer.Elapsed += new ElapsedEventHandler(OnTimedEvent); aTimer.Interval = 1000; aTimer.Enabled = true; } private void OnTimedEvent(object sender, EventArgs e) { this.Dispatcher.Invoke(DispatcherPriority.Normal, new TimerDispatcherDelegate(updateUI)); } private void updateUI() { timeLabel.Content = DateTime.Now.ToUniversalTime(); } } }

通過這些，我想到，其實多線程訪問UI的都是相通的，在Winform中為了更新UI,我們都會有帶有Invoke或者委托來實現,而Timer要用來更新,主要看這個Timer是否多線程的。