Windows Phone 自定义一个启动画面

<UserControl x:Class="LoadingPage.PopupSplash"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    FontFamily="{StaticResource PhoneFontFamilyNormal}"
    FontSize="{StaticResource PhoneFontSizeNormal}"
    Foreground="{StaticResource PhoneForegroundBrush}"
    d:DesignHeight="480" d:DesignWidth="480">

    <Grid x:Name="LayoutRoot" Background="White" Width="480" Height="800">
        <ProgressBar HorizontalAlignment="Left" Margin="0,755,0,0" Name="progressBar1" Width="480" Background="DarkRed"   />
        <TextBlock HorizontalAlignment="Left" Margin="171,656,0,97" Name="textBlock1" Text="Loading..." Width="208" Foreground="Black" FontSize="30" />
    </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;

namespace LoadingPage
{
    public partial class PopupSplash : UserControl
    {
        public PopupSplash()
        {
            InitializeComponent();
            this.progressBar1.IsIndeterminate = true;//指示进度条是使用重复模式报告一般进度
        }
    }
}

<phone:PhoneApplicationPage 
    x:Class="LoadingPage.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
    xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="768"
    FontFamily="{StaticResource PhoneFontFamilyNormal}"
    FontSize="{StaticResource PhoneFontSizeNormal}"
    Foreground="{StaticResource PhoneForegroundBrush}"
    SupportedOrientations="Portrait" Orientation="Portrait"
    shell:SystemTray.IsVisible="True">

    <!--LayoutRoot 是包含所有页面内容的根网格-->
    <Grid x:Name="LayoutRoot" Background="Transparent">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>

        <!--TitlePanel 包含应用程序的名称和页标题-->
        <StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,28">
            <TextBlock x:Name="ApplicationTitle" Text="我的应用程序" Style="{StaticResource PhoneTextNormalStyle}"/>
            <TextBlock x:Name="PageTitle" Text="页面名称" Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}"/>
        </StackPanel>

        <!--ContentPanel - 在此处放置其他内容-->
        <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0"></Grid>
    </Grid>
</phone:PhoneApplicationPage>

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 Microsoft.Phone.Controls;
using System.Windows.Controls.Primitives;
using System.ComponentModel;
using System.Threading;

namespace LoadingPage
{
    public partial class MainPage : PhoneApplicationPage
    {
        private Popup popup; 
        private BackgroundWorker backroungWorker;
        // 构造函数
        public MainPage()
        {
            InitializeComponent();
            ShowPopup();
        }

        private void ShowPopup()        
        {            
            this.popup = new Popup();            
            this.popup.Child = new PopupSplash();//设置 Popup 控件的内容,把自定义的PopupSplash控件填充到popup控件上            
            this.popup.IsOpen = true;            
            StartLoadingData();//开始加载数据        
        }        
        
        private void StartLoadingData()        
        {            
            //使用BackgroundWorker在单独的线程上执行操作            
            backroungWorker = new BackgroundWorker();            
            //调用 RunWorkerAsync后台操作时引发此事件，即后台要处理的事情写在这个事件里面            
            backroungWorker.DoWork += new DoWorkEventHandler(backroungWorker_DoWork);            
            //当后台操作完成事件            
            backroungWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(backroungWorker_RunWorkerCompleted); 
            //开始执行后台操作            
            backroungWorker.RunWorkerAsync();        
        }        //后台操作完成        
        
        void backroungWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)        
        {            
            this.Dispatcher.BeginInvoke(() =>                
            {                    
                this.popup.IsOpen = false;//关闭popup  注意要使用Dispatcher.BeginInvoke开跟UI通讯                
            }            );       
        }        
        
        //后台操作处理        
        void backroungWorker_DoWork(object sender, DoWorkEventArgs e)        
        {            
            // 程序初始化处理   这里只是模拟了一下            
            Thread.Sleep(7000);        
        }    
    }
}