稳扎稳打Silverlight(32) - 2.0Tip/Trick之MessageBox, Popup, 循环的几种实现方法, 动态变换主题

<UserControl x:Class="Silverlight20.Tip.LoopsDemo" 
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"    
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> 
        <Grid x:Name="LayoutRoot" Background="White"> 
                <StackPanel> 
                        <StackPanel Orientation="Horizontal" Margin="5"> 
                                <TextBlock Text="DispatcherTimer: " /> 
                                <TextBlock x:Name="resultDispatcherTimer" /> 
                        </StackPanel> 
                        <StackPanel Orientation="Horizontal" Margin="5"> 
                                <TextBlock Text="Timer: " /> 
                                <TextBlock x:Name="resultTimer" /> 
                        </StackPanel> 
                        <StackPanel Orientation="Horizontal" Margin="5"> 
                                <TextBlock Text="StoryBoard: " /> 
                                <TextBlock x:Name="resultStoryBoard" /> 
                        </StackPanel> 
                        <StackPanel Orientation="Horizontal" Margin="5"> 
                                <TextBlock Text="CompositionTarget: " /> 
                                <TextBlock x:Name="resultCompositionTarget" /> 
                        </StackPanel> 
                </StackPanel> 
        </Grid> 
</UserControl>

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Net; 
using System.Windows; 
using System.Windows.Controls; 
using System.Windows.Documents; 
using System.Windows.Input; 
using System.Windows.Media; 
using System.Windows.Media.Animation; 
using System.Windows.Shapes; 
 
using System.Windows.Threading; 
using System.Threading; 
 
namespace Silverlight20.Tip 
{ 
         public partial  class LoopsDemo : UserControl 
        { 
                 public LoopsDemo() 
                { 
                        InitializeComponent(); 
 
                         this.Loaded +=  new RoutedEventHandler(LoopsDemo_Loaded); 
                } 
 
                 void LoopsDemo_Loaded( object sender, RoutedEventArgs e) 
                { 
                        DispatcherTimerDemo(); 
                        StoryboardDemo(); 
                        TimerDemo(); 
                        CompositionTargetDemo(); 
                } 
 
 
                 /// <summary> 
                 /// DispatcherTimer - 在 UI 线程上循环（会受到 UI 线程的影响） 
                 /// </summary> 
                 private  void DispatcherTimerDemo() 
                { 
                        DispatcherTimer dTimer =  new DispatcherTimer(); 
                        dTimer.Interval = TimeSpan.Zero; 
                        dTimer.Tick +=  new EventHandler(dTimer_Tick); 
                        dTimer.Start(); 
                } 
 
                 void dTimer_Tick( object sender, EventArgs e) 
                { 
                        resultDispatcherTimer.Text = DateTime.Now.ToString( "hh:mm:ss fff"); 
                } 
 
 
                Storyboard _board; 
                 /// <summary> 
                 /// Storyboard - 在非 UI 线程上循环 
                 /// </summary> 
                 private  void StoryboardDemo() 
                { 
                        _board =  new Storyboard(); 
                        _board.Duration = TimeSpan.Zero; 
                        _board.Completed +=  new EventHandler(_board_Completed); 
                        _board.Begin(); 
                } 
 
                 void _board_Completed( object sender, EventArgs e) 
                { 
                        resultStoryBoard.Text = DateTime.Now.ToString( "hh:mm:ss fff"); 
                        _board.Begin(); 
                } 
 
 
                Timer _timer; 
                 /// <summary> 
                 /// Timer - 在非 UI 线程上循环 
                 /// </summary> 
                 private  void TimerDemo() 
                { 
                        _timer =  new Timer(_timer_CallBack,  null, TimeSpan.Zero, TimeSpan.Zero); 
                } 
 
                 private  void _timer_CallBack( object state) 
                { 
                         this.Dispatcher.BeginInvoke(() => 
                        { 
                                resultTimer.Text = DateTime.Now.ToString( "hh:mm:ss fff"); 
                        }); 
                        _timer.Change(TimeSpan.Zero, TimeSpan.Zero); 
                } 
 
 
                 /// <summary> 
                 /// CompositionTarget.Rendering - 每呈现 1 帧都会触发此事件（相当于 Flash 的 Event.ENTER_FRAME） 
                 /// </summary> 
                 private  void CompositionTargetDemo() 
                { 
                        CompositionTarget.Rendering +=  new EventHandler(CompositionTarget_Rendering); 
                } 
 
                 void CompositionTarget_Rendering( object sender, EventArgs e) 
                { 
                        resultCompositionTarget.Text = DateTime.Now.ToString( "hh:mm:ss fff"); 
                } 
        } 
}