稳扎稳打Silverlight(31) - 2.0Tip/Trick之加载XAP, 加载XAML, 加载DLL, AppManifest.xaml文件说明

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.Windows.Resources; 
using System.IO; 
using System.Xml.Linq; 
using System.Reflection; 
 
namespace Silverlight20.Tip 
{ 
         public partial  class LoadXap : UserControl 
        { 
                 public LoadXap() 
                { 
                        InitializeComponent(); 
                } 
 
                 private  void load_Click( object sender, RoutedEventArgs e) 
                { 
                        Uri uri =  new Uri( "YYTetris.xap", UriKind.Relative); 
 
                         // 用 WebClient 下载指定的 XAP 
                        WebClient client =  new WebClient(); 
                        client.OpenReadCompleted +=  new OpenReadCompletedEventHandler(client_OpenReadCompleted); 
                        client.OpenReadAsync(uri); 
                } 
 
                 void client_OpenReadCompleted( object sender, OpenReadCompletedEventArgs e) 
                { 
                         /* 
                         * StreamResourceInfo - 提供对通过 Silverlight 应用程序模型检索资源的支持 
                         * AssemblyPart - 包含在 Silverlight 程序内的程序集 
                         *         AssemblyPart.Load() - 加载指定的程序集到当前应用程序域中 
                         * Application.GetResourceStream() - 对 zip 类型的文件自动解压缩 
                         */ 
 
                         // YYTetris.xap 的 AppManifest.xaml 的信息如下 
                         /*    
                        <Deployment xmlns="http://schemas.microsoft.com/client/2007/deployment" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" EntryPointAssembly="YYTetris" EntryPointType="YYTetris.App" RuntimeVersion="2.0.31005.0"> 
                            <Deployment.Parts> 
                                <AssemblyPart x:Name="YYTetris" Source="YYTetris.dll" /> 
                            </Deployment.Parts> 
                        </Deployment>         
                        */ 
 
                         // 可以通过 Deployment.Current 检索 AppManifest.xaml 中的 Deployment 对象 
 
                         // 取得 XAP 的 AppManifest.xaml 中的 Deployment.Parts 内的全部 AssemblyPart 节点信息 
                        StreamResourceInfo resource = App.GetResourceStream( 
                                 new StreamResourceInfo(e.Result,  null),    
                                 new Uri( "AppManifest.xaml", UriKind.Relative)); 
                         string resourceManifest =  new StreamReader(resource.Stream).ReadToEnd(); 
                        List<XElement> assemblyParts = XDocument.Parse(resourceManifest).Root.Elements().Elements().ToList(); 
 
                        Assembly assembly =  null; 
 
                         foreach (XElement element  in assemblyParts) 
                        { 
                                 // 取出 AssemblyPart 的 Source 指定的 dll 
                                 string source = element.Attribute( "Source").Value; 
                                AssemblyPart assemblyPart =  new AssemblyPart(); 
                                StreamResourceInfo streamInfo = App.GetResourceStream( 
                                         new StreamResourceInfo(e.Result,  "application/binary"), 
                                         new Uri(source, UriKind.Relative)); 
 
                                 if (source ==  "YYTetris.dll") 
                                        assembly = assemblyPart.Load(streamInfo.Stream); 
                                 else 
                                        assemblyPart.Load(streamInfo.Stream); 
                        } 
 
                         // 实例化 YYTetris.xap 的主函数 
                        var type = assembly.GetType( "YYTetris.Page"); 
                        var yyTetris = Activator.CreateInstance(type)  as UIElement; 
 
                         // 添加 YYTetris.xap 到指定的容器内，并更新 UI 
                        container.Children.Add(yyTetris); 
                        container.UpdateLayout(); 
                } 
        } 
}