Silverlight for Windows Phone 7--Popup

在Windows Phone 7开发者我在不使用Progressbar的前提下又想告诉用户程序正在运行，显示一个进度对话框，这时我们就可以用Popup。

前台

<Popup x:Name="ProgressPopup" Width="300" IsOpen="False" HorizontalAlignment="Center"
VerticalAlignment="Top" d:LayoutOverrides="Width, HorizontalMargin" Margin="89,203,91,0">
<Border BorderThickness="10" BorderBrush="Black" Background="DarkGray" Padding="30,30">
<StackPanel>
<TextBlock MaxHeight="100" Foreground="White" FontWeight="Bold" FontSize="36" x:Name="txt" Text="1">
<TextBlock.Triggers>
<EventTrigger RoutedEvent="TextBlock.Loaded">
<BeginStoryboard> <Storyboard>
<DoubleAnimation AutoReverse="True" Duration="0:0:1"
From="1.0" RepeatBehavior="Forever" Storyboard.TargetName="txt" Storyboard.TargetProperty="Opacity" To="0.0"/>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</TextBlock.Triggers>
</TextBlock>
</StackPanel>
</Border>
</Popup>

后台

public partial class MainPage : PhoneApplicationPage
{
Storyboard _timer = new Storyboard();

int i=0;
public MainPage()
{
InitializeComponent();

_timer.Duration = TimeSpan.FromMilliseconds(10);
_timer.Completed += new EventHandler(_timer_Completed);
_timer.Begin();
i = Convert.ToInt32(txt.Text);
}

private void PhoneApplicationPage_Loaded(object sender, RoutedEventArgs e)
{
this.Dispatcher.BeginInvoke(new Action(() => ProgressPopup.IsOpen = true));
}

void _timer_Completed(object sender, EventArgs e)
{

if (i <= txt.MaxHeight)
{
i++;
this.txt.Text = i.ToString();
_timer.Begin();

return;
}

this.Dispatcher.BeginInvoke(new Action(() => { ProgressPopup.IsOpen = false; }));
}

}

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