忆龙2009：Silverlight学习笔记-根据需要动态加载应用程序集

下面介绍了一种方法，在当前程序集中动态向主机服务器检索并加载程序集的方法。该方法响应用户鼠标单击事件，使用 WebClient 类启动程序集的异步下载，在程序集下载完成后，使用 AssemblyPart 类来动态加载此程序集。 要实现这个功能，您的应用程序项目中必须已经引用了该程序集，同时，该程序集的"复制本地"值还必须为"False"，这样，它将不会部署在应用程序包中。 view plaincopy to clipboardprint?
<UserControl x:Class="SilverlightApplication.HomePage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Grid Background="SandyBrown">
<StackPanel x:Name="stackPanel">
<TextBlock>Page from Host Application</TextBlock>
<TextBlock
MouseLeftButtonUp="TextBlock_MouseLeftButtonUp"
Cursor="Hand">
Click Here to Display a UI from the Library Assembly
</TextBlock>
</StackPanel>
</Grid>
</UserControl>
<UserControl x:Class="SilverlightApplication.HomePage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> <Grid Background="SandyBrown">
<StackPanel x:Name="stackPanel">
<TextBlock>Page from Host Application</TextBlock>
<TextBlock
MouseLeftButtonUp="TextBlock_MouseLeftButtonUp"
Cursor="Hand">
Click Here to Display a UI from the Library Assembly
</TextBlock>
</StackPanel>
</Grid> </UserControl> view plaincopy to clipboardprint?
using System; // Uri
using System.Net; // WebClient,OpenReadCompletedEventHandler
using System.Windows; // AssemblyPart
using System.Windows.Controls; // UserControl
using System.Windows.Input; // MouseButtonEventArgs
using SilverlightLibrary; // Page
namespace SilverlightApplication
{
public partial class HomePage : UserControl
{
public HomePage()
{
InitializeComponent();
}
private void TextBlock_MouseLeftButtonUp(
object sender, MouseButtonEventArgs e)
{
// Download an "on-demand" assembly.
WebClient wc = new WebClient();
wc.OpenReadCompleted +=
new OpenReadCompletedEventHandler(wc_OpenReadCompleted);
wc.OpenReadAsync(
new Uri("SilverlightLibrary.dll", UriKind.Relative));
}
private void wc_OpenReadCompleted(
object sender, OpenReadCompletedEventArgs e)
{
if ((e.Error == null) && (e.Cancelled == false))
{
// Convert the downloaded stream into an assembly that is
// loaded into current AppDomain.
AssemblyPart assemblyPart = new AssemblyPart();
assemblyPart.Load(e.Result);
DisplayPageFromLibraryAssembly();
}
}
private void DisplayPageFromLibraryAssembly() {
// Create an instance of the Page class in the library assembly.
Page page = new Page();
// Display the new Page.
this.stackPanel.Children.Add(page);
}
}
}