在silverlight开发，允许我们获取指定URL压缩包（zip）并读取其中的图片文件。而实现这个功能也非常简单。下面是运行效果图：
首先，我们需要建立一个silverligth application ，名称为：DownLoadImg.
下面就是相应的page.xaml代码:
好了，今天的内容就到这里了。
首先，我们需要建立一个silverligth application ，名称为：DownLoadImg.
下面就是相应的page.xaml代码:
<
Grid
x:Name
="LayoutRoot"
Background
="White"
>
< Grid.RowDefinitions >
< RowDefinition Height ="250" />
< RowDefinition Height ="100" />
< RowDefinition Height ="50" />
</ Grid.RowDefinitions >
< StackPanel Grid.Row ="1" >
< ListBox x:Name ="ImageList" />
< Button x:Name ="Download" Click ="StartDownLoad" Content ="下载该图片" />
</ StackPanel >
< StackPanel Grid.Row ="0" >
< ScrollViewer HorizontalScrollBarVisibility ="Auto" >
< Image x:Name ="ImgToFill" >
</ Image >
</ ScrollViewer >
</ StackPanel >
< StackPanel Grid.Row ="2" >
< Canvas Canvas.Top ="70" >
< Rectangle Name ="progressRectangle" Height ="10" Width ="0" Fill ="AliceBlue" />
< Rectangle Height ="12" Width ="202" StrokeThickness ="1" Stroke ="Black" />
< TextBlock x:Name ="progressText" Canvas.Left ="210" Text ="0%" FontSize ="12" />
</ Canvas >
</ StackPanel >
</ Grid >
< Grid.RowDefinitions >
< RowDefinition Height ="250" />
< RowDefinition Height ="100" />
< RowDefinition Height ="50" />
</ Grid.RowDefinitions >
< StackPanel Grid.Row ="1" >
< ListBox x:Name ="ImageList" />
< Button x:Name ="Download" Click ="StartDownLoad" Content ="下载该图片" />
</ StackPanel >
< StackPanel Grid.Row ="0" >
< ScrollViewer HorizontalScrollBarVisibility ="Auto" >
< Image x:Name ="ImgToFill" >
</ Image >
</ ScrollViewer >
</ StackPanel >
< StackPanel Grid.Row ="2" >
< Canvas Canvas.Top ="70" >
< Rectangle Name ="progressRectangle" Height ="10" Width ="0" Fill ="AliceBlue" />
< Rectangle Height ="12" Width ="202" StrokeThickness ="1" Stroke ="Black" />
< TextBlock x:Name ="progressText" Canvas.Left ="210" Text ="0%" FontSize ="12" />
</ Canvas >
</ StackPanel >
</ Grid >
接下来是
page.xaml.cs(相关内容见注释):
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.IO;
using System.Windows.Resources;
using System.Windows.Media.Imaging;
namespace DownLoadImg
{
public partial class Page : UserControl
{
WebClient wc = new WebClient();
public Page()
{
InitializeComponent();
this .Loaded += new RoutedEventHandler(Page_Loaded);
}
// 加载图片列表数据
void Page_Loaded( object sender, RoutedEventArgs e)
{
ImageList.Items.Add( " 1.jpg " );
ImageList.Items.Add( " 2.png " );
}
// 实例化下载设置
void StartDownLoad( object o, EventArgs e)
{
// 初始化相应控件信息
ImgToFill.Visibility = Visibility.Collapsed;
progressRectangle.Width = 0 ;
progressText.Text = " 0% " ;
// 绑定下载过程中处理的事件
wc.OpenReadCompleted += new OpenReadCompletedEventHandler(wc_OpenReadCompleted);
wc.DownloadProgressChanged += new DownloadProgressChangedEventHandler(wc_DownloadProgressChanged);
// 开始异步读取压缩包中的文件信息
wc.OpenReadAsync( new Uri( " img.zip " , UriKind.Relative), ImageList.SelectedItem);
}
void wc_OpenReadCompleted( object sender, OpenReadCompletedEventArgs e)
{
// 实例化流资源信息，准备获取其中的图片数据
StreamResourceInfo sri = new StreamResourceInfo(e.Result as Stream, null );
// 要读取的图片路径信息
String sURI = e.UserState as String;
// 从流资源中获取指定的URL图片流信息
StreamResourceInfo imageStream = Application.GetResourceStream(sri, new Uri(sURI, UriKind.Relative));
BitmapImage imgsrc = new BitmapImage();
// 绑定该URL图片信息并进行显示
imgsrc.SetSource(imageStream.Stream);
ImgToFill.Source = imgsrc;
ImgToFill.Visibility = Visibility.Visible;
ImgToFill.Stretch = Stretch.Fill;
}
void wc_DownloadProgressChanged( object sender, DownloadProgressChangedEventArgs e)
{
// 下载过程中的进度显示
progressText.Text = e.ProgressPercentage.ToString() + " % " ;
progressRectangle.Width = ( double )e.ProgressPercentage * 2 ;
}
}
}
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.IO;
using System.Windows.Resources;
using System.Windows.Media.Imaging;
namespace DownLoadImg
{
public partial class Page : UserControl
{
WebClient wc = new WebClient();
public Page()
{
InitializeComponent();
this .Loaded += new RoutedEventHandler(Page_Loaded);
}
// 加载图片列表数据
void Page_Loaded( object sender, RoutedEventArgs e)
{
ImageList.Items.Add( " 1.jpg " );
ImageList.Items.Add( " 2.png " );
}
// 实例化下载设置
void StartDownLoad( object o, EventArgs e)
{
// 初始化相应控件信息
ImgToFill.Visibility = Visibility.Collapsed;
progressRectangle.Width = 0 ;
progressText.Text = " 0% " ;
// 绑定下载过程中处理的事件
wc.OpenReadCompleted += new OpenReadCompletedEventHandler(wc_OpenReadCompleted);
wc.DownloadProgressChanged += new DownloadProgressChangedEventHandler(wc_DownloadProgressChanged);
// 开始异步读取压缩包中的文件信息
wc.OpenReadAsync( new Uri( " img.zip " , UriKind.Relative), ImageList.SelectedItem);
}
void wc_OpenReadCompleted( object sender, OpenReadCompletedEventArgs e)
{
// 实例化流资源信息，准备获取其中的图片数据
StreamResourceInfo sri = new StreamResourceInfo(e.Result as Stream, null );
// 要读取的图片路径信息
String sURI = e.UserState as String;
// 从流资源中获取指定的URL图片流信息
StreamResourceInfo imageStream = Application.GetResourceStream(sri, new Uri(sURI, UriKind.Relative));
BitmapImage imgsrc = new BitmapImage();
// 绑定该URL图片信息并进行显示
imgsrc.SetSource(imageStream.Stream);
ImgToFill.Source = imgsrc;
ImgToFill.Visibility = Visibility.Visible;
ImgToFill.Stretch = Stretch.Fill;
}
void wc_DownloadProgressChanged( object sender, DownloadProgressChangedEventArgs e)
{
// 下载过程中的进度显示
progressText.Text = e.ProgressPercentage.ToString() + " % " ;
progressRectangle.Width = ( double )e.ProgressPercentage * 2 ;
}
}
}
好了，今天的内容就到这里了。
本文转自 daizhenjun 51CTO博客，原文链接：http://blog.51cto.com/daizhj/82425，如需转载请自行联系原作者
