Silverlight中大图片的加载进度

使用System.Media.Imaging.BitmapImage类的DownloadProgress事件，再配合ProgressBar等控件即可做出进度条效果，下面代码中就只简单的使用TextBlock显示进度

1、MainPage.xaml代码

1: <Grid x:Name="LayoutRoot" Background="White">

2: <Image x:Name="img"/>

3: <TextBlock Text="正在加载 0%" x:Name="TxtLoading" HorizontalAlignment="Center" Foreground="Black" VerticalAlignment="Center" />

4: </Grid>

2、MainPage.xaml.cs代码

1: public partial class MainPage : UserControl

2: {

3: BitmapImage bitmapImage;

4: 

5: public MainPage()

6: {

7: InitializeComponent();

8: this.Loaded += new RoutedEventHandler(MainPage_Loaded);

9: }

10: 

11: private void MainPage_Loaded(object sender, RoutedEventArgs e)

12: {

13: bitmapImage = new BitmapImage();

14: img.Source = bitmapImage;

15: bitmapImage.UriSource = new Uri("http://192.168.178.222/test.jpg");

16: img.Stretch = Stretch.Fill;

17: bitmapImage.DownloadProgress += new EventHandler<DownloadProgressEventArgs>(bitmapImage_DownloadProgress);

18: }

19: 

20: private void bitmapImage_DownloadProgress(object sender, DownloadProgressEventArgs e)

21: {

22: TxtLoading.Text = string.Format("正在加载 {0}%", e.Progress);

23: }

24: }