＜Grid x:Name="LayoutRoot" Background="Black" ShowGridLines="False" Margin="8"＞
＜Grid.ColumnDefinitions＞
＜ColumnDefinition Width="196" /＞
＜ColumnDefinition Width="*" /＞
＜/Grid.ColumnDefinitions＞
＜Grid.RowDefinitions＞
＜RowDefinition Height="*" /＞
＜RowDefinition Height="48" /＞
＜/Grid.RowDefinitions＞
＜ListBox x:Name="myList" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"
ItemsSource="{Binding}"
Grid.Row="0"
Grid.Column="0"
Grid.RowSpan="2"
SelectionChanged="OnSelectionChanged" ＞
＜ListBox.ItemTemplate＞
＜DataTemplate＞
＜TextBlock Text="{Binding Name}" /＞
＜/DataTemplate＞
＜/ListBox.ItemTemplate＞
＜/ListBox＞
＜my:GridSplitter Width="1" HorizontalAlignment="Left" VerticalAlignment="Stretch" Grid.Column="1"＞＜/my:GridSplitter＞

＜Image x:Name="myImage" Grid.Column="1" /＞
＜StackPanel Grid.Row="1" Background="white" Grid.ColumnSpan="2" Orientation="Horizontal" HorizontalAlignment="Stretch"＞
＜Button Grid.Row="1"
Grid.Column="0"
Content="选择图片"
Margin="8" Click="OnClick" FontSize="16" Width="100"/＞
＜Button Grid.Row="1"
Grid.Column="2"
Content="上传该图片"
Margin="8" Click="OnUpLoadClick" FontSize="16" Width="100"/＞
＜/StackPanel＞
＜/Grid＞

而相应的page.xmal.cs代码也做了修改（相关内容见注释）：

public partial class Page : UserControl
{
public Page()
{
InitializeComponent();
}

void OnClick(object sender, EventArgs args)
{
OpenFileDialog openFileDialog = new OpenFileDialog()
{
Filter = "Jpeg Files (*.jpg)|*.jpg|All Files(*.*)|*.*",
Multiselect = true
};

if (openFileDialog.ShowDialog() == true)//.DialogResult.OK)
{
myList.DataContext = openFileDialog.SelectedFiles;
}
}

void OnUpLoadClick(object sender, EventArgs args)
{
if (fi != null)
{
WebClient webclient = new WebClient();

webclient.OpenWriteCompleted += new OpenWriteCompletedEventHandler(webclient_OpenWriteCompleted);
webclient.OpenWriteAsync(new Uri("http://localhost:5840/UploadFileWeb/Handler.ashx", UriKind.Absolute), "POST", fi.OpenRead());
}
else
{
HtmlPage.Window.Alert("请选取相应图片!!!");
}
}

void webclient_OpenWriteCompleted(object sender, OpenWriteCompletedEventArgs e)
{
//将图片数据流发送到服务器上
Stream inputStream = e.UserState as Stream;
Stream outputStream = e.Result;

byte[] buffer = new byte[4096];
int bytesRead = 0;

while ((bytesRead = inputStream.Read(buffer, 0, buffer.Length)) ＞ 0)
{
outputStream.Write(buffer, 0, bytesRead);
}
outputStream.Close();
inputStream.Close(); HtmlPage.Window.Alert("图片上传成功!!!");
}

FileDialogFileInfo fi ; //获取选定图片信息

private void OnSelectionChanged(object sender, SelectionChangedEventArgs e)
{
if ((e.AddedItems != null) && (e.AddedItems.Count ＞ 0))
{
fi = e.AddedItems[0] as FileDialogFileInfo;

if (fi != null)
{
using (Stream stream = fi.OpenRead())
{
BitmapImage image = new BitmapImage();
image.SetSource(stream);
myImage.Source = image;
myImage.Visibility = Visibility.Visible;
stream.Close();
}
}
}
}

}