在 Silverlight 4 中使用 OpenFileDialog 浏览本地图片

代震军BLOG 上有一篇关于 在 Silverlight 中使用 OpenFileDialog 浏览本地图片 的文章，不过他是 Silverlight 2 下开发，而 Silverlight 的版本现在已经更新到 Silverlight 4 了，我将它下载下来研究，发现并不能直接在 Silverlight 4(Visual Studio 2010) 下运行。所以将其代码稍作了修改以便能在 Silverlight 4(Visual Studio 2010) 下运行，有需要的朋友可以在这里下载 源代码下载。

 

修改后的代码如下：

1. MainPage.xaml 文件

 1 <UserControl x:Class="BrowsePhotos.MainPage"
 2     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
 3     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
 4     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
 5     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
 6     mc:Ignorable="d"
 7     d:DesignHeight="300" d:DesignWidth="400">
 8 
 9     <Grid x:Name="LayoutRoot" Background="Black" ShowGridLines="True" Margin="8">
10         <Grid.ColumnDefinitions>
11             <ColumnDefinition Width="196" />
12             <ColumnDefinition Width="*" />
13         </Grid.ColumnDefinitions>
14         <Grid.RowDefinitions>
15             <RowDefinition Height="*" />
16             <RowDefinition Height="48" />
17         </Grid.RowDefinitions>
18         
19         <ListBox x:Name="myList"
20               HorizontalAlignment="Stretch" 
21               VerticalAlignment="Stretch"
22               ItemsSource="{Binding}"
23               Grid.Row="0"
24               Grid.Column="0"
25               Grid.RowSpan="2"
26               SelectionChanged="myList_SelectionChanged">
27             <ListBox.ItemTemplate>
28                 <DataTemplate>
29                     <TextBlock Text="{Binding Name}" />
30                 </DataTemplate>
31             </ListBox.ItemTemplate>
32         </ListBox>
33 
34         <Image  x:Name="myImage" Grid.Column="1" />
35         <Button Grid.Row="1"
36           Grid.Column="1"
37           Content="选择图片"
38           Margin="8" Click="Button_Click" FontSize="16" />
39     </Grid>
40 </UserControl>

 

 

 2. MainPage.xaml.cs 文件

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Net;
 5 using System.IO;
 6 using System.Windows;
 7 using System.Windows.Controls;
 8 using System.Windows.Documents;
 9 using System.Windows.Input;
10 using System.Windows.Media;
11 using System.Windows.Media.Imaging;
12 using System.Windows.Media.Animation;
13 using System.Windows.Shapes;
14 
15 namespace BrowsePhotos
16 {
17     public partial class MainPage : UserControl
18     {
19         public MainPage()
20         {
21             InitializeComponent();
22         }
23 
24         private void Button_Click(object sender, RoutedEventArgs e)
25         {
26             OpenFileDialog dlg = new OpenFileDialog()
27             {
28                 Filter = "Jpeg Files (*.jpg)|*.jpg|All Files (*.*)|*.*",
29                 Multiselect = true
30             };
31 
32             if (true == dlg.ShowDialog())
33             {
34                 myList.DataContext = dlg.Files;
35             }
36         }
37 
38         private void myList_SelectionChanged(object sender, SelectionChangedEventArgs e)
39         {
40             if ((e.AddedItems != null) && (e.AddedItems.Count > 0))
41             {
42                 FileInfo fi = e.AddedItems[0] as FileInfo;
43                 if (fi != null)
44                 {
45                     using (Stream stream = fi.OpenRead())
46                     {
47                         BitmapImage image = new BitmapImage();
48                         image.SetSource(stream);
49                         myImage.Source = image;
50                         myImage.Visibility = Visibility.Visible;
51                         stream.Close();
52                     }
53                 }
54             }
55         }
56     }
57 }
58