<UserControl x:Class="Silverlight20.Tip.LoadXap" 
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"    
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> 
        <Grid x:Name="LayoutRoot" Background="White"> 
                <StackPanel> 
                        <Button x:Name="load" Content="加载游戏 - 俄罗斯方块" Click="load_Click" Margin="5" /> 
                        <Grid x:Name="container" Margin="5" /> 
                </StackPanel> 
        </Grid> 
</UserControl>

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(); 
                } 
        } 
}

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; 
 
namespace Silverlight20.Tip 
{ 
        public partial class LoadXaml : UserControl 
        { 
                public LoadXaml() 
                { 
                        InitializeComponent(); 
 
                        this.Loaded += new RoutedEventHandler(LoadXaml_Loaded); 
                } 
 
                void LoadXaml_Loaded(object sender, RoutedEventArgs e) 
                { 
                        // 获取指定的 Xaml 
                        Uri uri = new Uri("/Silverlight20;component/Tip/XamlDemo.xaml", UriKind.Relative); 
                        StreamResourceInfo resource = App.GetResourceStream(uri); 
 
                        using (StreamReader reader = new StreamReader(resource.Stream)) 
                        { 
                                // XamlReader.Load() - 加载 Xaml 
                                UserControl control = 
                                        System.Windows.Markup.XamlReader.Load(reader.ReadToEnd()) as UserControl; 
 
                                LayoutRoot.Children.Add(control); 
                        } 
                } 
        } 
}

using System; 
using System.Net; 
using System.Windows; 
using System.Windows.Controls; 
using System.Windows.Documents; 
using System.Windows.Ink; 
using System.Windows.Input; 
using System.Windows.Media; 
using System.Windows.Media.Animation; 
using System.Windows.Shapes; 
 
namespace LoadDllDemo 
{ 
        public class Test 
        { 
                /// <summary> 
                /// Say Hello 的方法 
                /// </summary> 
                /// <param name="name">名字</param> 
                /// <returns></returns> 
                public string Hello(string name) 
                { 
                        return "Hello: " + name; 
                } 
        } 
}

<UserControl x:Class="Silverlight20.Tip.LoadDll" 
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"    
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> 
        <Grid x:Name="LayoutRoot" Background="White"> 
                 
                <TextBlock x:Name="lblResult" Margin="5" /> 
                 
        </Grid> 
</UserControl>

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.Reflection; 
 
namespace Silverlight20.Tip 
{ 
        public partial class LoadDll : UserControl 
        { 
                public LoadDll() 
                { 
                        InitializeComponent(); 
 
                        this.Loaded += new RoutedEventHandler(LoadDll_Loaded); 
                } 
 
                void LoadDll_Loaded(object sender, RoutedEventArgs e) 
                { 
                        Uri uri = new Uri("LoadDllDemo.dll", UriKind.Relative); 
 
                        // 用 WebClient 下载指定的 DLL 
                        WebClient client = new WebClient(); 
                        client.OpenReadCompleted += new OpenReadCompletedEventHandler(client_OpenReadCompleted); 
                        client.OpenReadAsync(uri); 
                } 
 
                void client_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e) 
                { 
                        // 加载指定的 dll 
                        AssemblyPart assemblyPart = new AssemblyPart(); 
                        Assembly assembly = assemblyPart.Load(e.Result); 
 
                        // 调用 LoadDllDemo.Test 的 Hello 方法，参数为 webabcd 
                        Type type = assembly.GetType("LoadDllDemo.Test"); 
                        object obj = Activator.CreateInstance(type); 
                        MethodInfo methodInfo = type.GetMethod("Hello"); 
                        lblResult.Text = methodInfo.Invoke(obj, new object[] { "webabcd" }).ToString(); 
 
 
                        // 注： 
                        // AssemblyPart.Load() 用于把程序集加载到当前程序域 
                        // 此特性可实现按需加载程序集（部署时，把这类的程序集从 xap 包中移除，用到时再调用指定发方法下载即可） 
                } 
        } 
}

<Deployment xmlns="http://schemas.microsoft.com/client/2007/deployment" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" EntryPointAssembly="Silverlight20" EntryPointType="Silverlight20.App" RuntimeVersion="2.0.31005.0"> 
    <Deployment.Parts> 
        <AssemblyPart x:Name="Silverlight20" Source="Silverlight20.dll" /> 
        <AssemblyPart x:Name="Microsoft.Windows.Controls" Source="Microsoft.Windows.Controls.dll" /> 
    </Deployment.Parts> 
</Deployment> 

一个 Silverlight 应用程序包（xap）内都会包含 AppManifest.xaml 文件，其内标识着打包的程序集和程序入口等信息 

Deployment - 根节点 
EntryPointAssembly - 程序入口的程序集 
EntryPointType - 程序入口的类型 
RuntimeVersion - 所需的 Silverlight 插件的版本 
AssemblyPart - 标识 Silverlight 程序包（xap）内的程序集。其中的 Source 属性用于标识程序集的路径

<UserControl x:Class="Silverlight20.Tip.CustomMouseCursor" 
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"    
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> 
        <Grid x:Name="LayoutRoot" Background="Bisque"> 
                <Canvas x:Name="canvas"> 
                        <Ellipse x:Name="ellipse" Width="30" Height="30" Fill="Red" /> 
                </Canvas> 
        </Grid> 
</UserControl>

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; 
 
namespace Silverlight20.Tip 
{ 
        public partial class CustomMouseCursor : UserControl 
        { 
                public CustomMouseCursor() 
                { 
                        InitializeComponent(); 
 
                        this.MouseMove += new MouseEventHandler(MouseFollow_MouseMove); 
                } 
 
                // 自定义鼠标指针的实现如下。鼠标跟随也是同理的做 
                void MouseFollow_MouseMove(object sender, MouseEventArgs e) 
                { 
                        ellipse.SetValue(Canvas.LeftProperty, e.GetPosition(canvas).X - ellipse.ActualWidth / 2); 
                        ellipse.SetValue(Canvas.TopProperty, e.GetPosition(canvas).Y - ellipse.ActualHeight / 2); 
                } 
        } 
}