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。

 

 

<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="Sandy<a href="/tag/bro/" target="_blank" class="keywords">bro</a>wn"> <StackPanel x:Name="stackPanel"> <TextBlock>Page from Host Application</TextBlock> <TextBlock MouseLeftButtonUp="TextBlock_MouseLeftButtonUp" Cursor="Hand"> Click Here to <a href="/tag/dis/" target="_blank" class="keywords">dis</a>play a UI from the Library Assembly </TextBlock> </StackPanel> </Grid> </UserControl>

 

using Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>; // Uri using Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>.Net; // WebClient,OpenReadCompletedEventHandler using Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>.Windows; // AssemblyPart using Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>.Windows.Controls; // UserControl using Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>.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); <a href="/tag/dis/" target="_blank" class="keywords">dis</a>playPageFromLibraryAssembly(); } } private void <a href="/tag/dis/" target="_blank" class="keywords">dis</a>playPageFromLibraryAssembly() { // Create an instance of the Page class in the library assembly. Page page = new Page(); // <a href="/tag/dis/" target="_blank" class="keywords">dis</a>play the new Page. this.stackPanel.Children.Add(page); } } }