ApplicationBar控件時windows phone 7上的一個菜單，它傳統(tǒng)的Windows程序的菜單的作用類似。
ApplicationBar（ApplicationBarIconButton和ApplicationBarMenuItem）相關(guān)的類定義在Microsoft.Phone.Shell命名空間。與UIElement和FrameworkElement等常規(guī)Silverlight編程的類層次是完全分開的，嚴格說來ApplicationBar不是你的頁面的可視化的一部分。
一個ApplicationBar最多可包含四個按鈕。如果還有額外的選項可以通過菜單項來添加，這些菜單項默認是不顯示的。只有在點擊菜單欄右側(cè)的省略號(或省略號下方的區(qū)域)時才會顯示出來。

該項目包含一個MediaElement MoviePlayer播放影片，而ApplicationBar包含第一，播放，暫停，最后四個選項。

<!--LayoutRoot contains the root grid where all other page content is placed-->
<Grid x:Name="LayoutRoot" Background="Transparent">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>

<!--TitlePanel contains the name of the application and page title-->
<StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,28">
<TextBlock x:Name="ApplicationTitle" Text="MOVIE PLAYER" Style="{StaticResource PhoneTextNormalStyle}"/>
</StackPanel>

<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
<MediaElement Name="mediaElement"
Source="http://localhost/123.wmv"
AutoPlay="False"
MediaOpened="OnMediaElementMediaOpened"
MediaFailed="OnMediaElementMediaFailed"
CurrentStateChanged="OnMediaElementCurrentStateChanged" />

<TextBlock Name="statusText"
HorizontalAlignment="Left"
VerticalAlignment="Bottom" />

<TextBlock Name="errorText"
HorizontalAlignment="Right"
VerticalAlignment="Bottom"
TextWrapping="Wrap" />
</Grid>
</Grid>

<phone:PhoneApplicationPage.ApplicationBar>
<shell:ApplicationBar>
<shell:ApplicationBarIconButton
x:Name="appbarRewindButton"
IconUri="Images/appbar.transport.rew.rest.png"
Text="rewind"
IsEnabled="False"
Click="OnAppbarRewindClick" />

<shell:ApplicationBarIconButton
x:Name="appbarPlayButton"
IconUri="Images/appbar.transport.play.rest.png"
Text="play"
IsEnabled="False"
Click="OnAppbarPlayClick" />

<shell:ApplicationBarIconButton
x:Name="appbarPauseButton"
IconUri="Images/appbar.transport.pause.rest.png"
Text="pause"
IsEnabled="False"
Click="OnAppbarPauseClick" />

<shell:ApplicationBarIconButton
x:Name="appbarEndButton"
IconUri="Images/appbar.transport.ff.rest.png"
Text="to end"
IsEnabled="False"
Click="OnAppbarEndClick" />
</shell:ApplicationBar>
</phone:PhoneApplicationPage.ApplicationBar> View Code using System;
using System.Windows;
using System.Windows.Media;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Shell;

namespace MoviePlayer
{
public partial class MainPage : PhoneApplicationPage
{
// Constructor
public MainPage()
{
InitializeComponent();

// Re-assign names already in the XAML file
appbarRewindButton = this.ApplicationBar.Buttons[0] as ApplicationBarIconButton;
appbarPlayButton = this.ApplicationBar.Buttons[1] as ApplicationBarIconButton;
appbarPauseButton = this.ApplicationBar.Buttons[2] as ApplicationBarIconButton;
appbarEndButton = this.ApplicationBar.Buttons[3] as ApplicationBarIconButton;
}

// ApplicationBar buttons
void OnAppbarRewindClick(object sender, EventArgs args)
{
mediaElement.Position = TimeSpan.Zero;
}

void OnAppbarPlayClick(object sender, EventArgs args)
{
mediaElement.Play();
}

void OnAppbarPauseClick(object sender, EventArgs args)
{
mediaElement.Pause();
}

void OnAppbarEndClick(object sender, EventArgs args)
{
mediaElement.Position = mediaElement.NaturalDuration.TimeSpan;
}

// MediaElement events
void OnMediaElementMediaFailed(object sender, ExceptionRoutedEventArgs args)
{
errorText.Text = args.ErrorException.Message;
}

void OnMediaElementMediaOpened(object sender, RoutedEventArgs args)
{
appbarRewindButton.IsEnabled = true;
appbarEndButton.IsEnabled = true;
}

void OnMediaElementCurrentStateChanged(object sender, RoutedEventArgs args)
{
statusText.Text = mediaElement.CurrentState.ToString();

if (mediaElement.CurrentState == MediaElementState.Stopped ||
mediaElement.CurrentState == MediaElementState.Paused)
{
appbarPlayButton.IsEnabled = true;
appbarPauseButton.IsEnabled = false;
}
else if (mediaElement.CurrentState == MediaElementState.Playing)
{
appbarPlayButton.IsEnabled = false;
appbarPauseButton.IsEnabled = true;
}
}
}
}

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