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1.在aspx页面中切换调用同一个SilverLight项目中的不同用户控件

1.1.       方法一

修改SilverLight项目启动文件App.xml的Application_Startup事件

  private void Application_Startup(object sender, StartupEventArgs e)

        {

            if (!e.InitParams.ContainsKey("InitPage"))

            {

                this.RootVisual = new MainPage();

                return;

            }

            switch (e.InitParams["InitPage"])

            {

                case "SilverlightControl1":

                    this.RootVisual = new SilverlightControl1();

                    break;

                case "SilverlightControl2":

                    this.RootVisual = new SilverlightControl2();

                    break;

                default:

                    this.RootVisual = new MainPage();

                    break;

            }

        }

修改aspx页面

<div id="silverlightControlHost">

           <object data="data:application/x-silverlight-2," type="application/x-silverlight-2" width="100%" height="100%" >

                <param name="source" value="ClientBin/Binglang.SilverlightDemo19.xap"/>

                <param name="InitParams" value="InitPage=SilverlightControl1" />

                <param name="onerror" value="onSilverlightError" />

                <param name="background" value="white" />

                <param name="minRuntimeVersion" value="3.0.40624.0" />

                <param name="autoUpgrade" value="true" />

                <a href="http://go.microsoft.com/fwlink/?LinkID=149156&v=3.0.40624.0" style="text-decoration: none;">

                     <img src="http://go.microsoft.com/fwlink/?LinkId=108181" alt="获取 Microsoft Silverlight" style="border-style: none"/>

                </a>

           </object><iframe id="_sl_historyFrame" style='visibility:hidden;height:0;width:0;border:0px'></iframe></div>

1.2.      方法二

修改SilverLight项目启动文件App.xml的Application_Startup事件

        private void Application_Startup(object sender, StartupEventArgs e)

        {

            if (!e.InitParams.ContainsKey("InitPage"))

            {

                this.RootVisual = new MainPage();

                return;

            }

            Assembly assembly = Assembly.GetExecutingAssembly();

            String rootName = String.Format("Binglang.SilverlightDemo19.{0}", e.InitParams["InitPage"]);

            UIElement rootVisual = assembly.CreateInstance(rootName) as UIElement;

            this.RootVisual = rootVisual;

        }

修改aspx页面

<div id="silverlightControlHost">

           <object data="data:application/x-silverlight-2," type="application/x-silverlight-2" width="100%" height="100%" >

                <param name="source" value="ClientBin/Binglang.SilverlightDemo19.xap"/>

                <param name="InitParams" value="InitPage=SilverlightControl1" />

                <param name="onerror" value="onSilverlightError" />

                <param name="background" value="white" />

                <param name="minRuntimeVersion" value="3.0.40624.0" />

                <param name="autoUpgrade" value="true" />

                <a href="http://go.microsoft.com/fwlink/?LinkID=149156&v=3.0.40624.0" style="text-decoration: none;">

                     <img src="http://go.microsoft.com/fwlink/?LinkId=108181" alt="获取 Microsoft Silverlight" style="border-style: none"/>

                </a>

           </object><iframe id="_sl_historyFrame" style='visibility:hidden;height:0;width:0;border:0px'></iframe></div>

2.调用不同SilverLight项目中的指定控件

2.1.建立项目

(1)Binglang.SilverlightDemo20

(2)Binglang.SilverlightDemo20.Web

(3) Binglang.ExternalProject

注意：项目Binglang.SilverlightDemo20中需要引用using System.Xml.Linq;

假设(1)和(3)中各有一个控件，名称都为MainPage.xaml (不一定要相同)

myButton.Click += new RoutedEventHandler(myButton_Click);

        void myButton_Click(object sender, RoutedEventArgs e)

        {

            WebClient client = new WebClient();

            client.OpenReadCompleted += new OpenReadCompletedEventHandler(webClient_OpenReadCompleted);

            //打开打包的xap文件

            client.OpenReadAsync(new Uri("Binglang.ExternalProject.xap", UriKind.Relative));

        }

        void webClient_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)

        {

//通过AppManifest.xaml文件取出动态库的信息

             Assembly asm = LoadAssemblyFromXap(e.Result, "Binglang.ExternalProject.dll");

            ////使用反射创建相关的实例，并在页面上加载

            holder.Children.Clear();

            UIElement element = asm.CreateInstance("Binglang.ExternalProject.MainPage") as UIElement;

            this.holder.Children.Add(element);

        }

        /// <summary>

        /// 通过AppManifest.xaml文件取出动态库的信息

        /// </summary>

        /// <param name="packageStream">OpenReadCompletedEventArgs e.Result</param>

        /// <param name="assemblyName">动态库文件名</param>

        /// <returns></returns>

   Assembly LoadAssemblyFromXap(Stream packageStream, string assemblyName)

        {

            //解包，读取AppManifest.xaml文件信息

            string appManifest = new StreamReader(Application.GetResourceStream(new StreamResourceInfo(packageStream, null), new Uri("AppManifest.xaml", UriKind.Relative)).Stream).ReadToEnd();

            //------------解析AppManifest.xaml信息内容

            XElement deploymentRoot = XDocument.Parse(appManifest).Root;

            List<XElement> deploymentParts = (from assemblyParts in deploymentRoot.Elements().Elements()

                                              select assemblyParts).ToList();

            Assembly asm = null;

            foreach (XElement xElement in deploymentParts)

            {

                string source = xElement.Attribute("Source").Value;

                AssemblyPart asmPart = new AssemblyPart();

                StreamResourceInfo streamInfo = Application.GetResourceStream(new StreamResourceInfo(packageStream, "application/binary"), new Uri(source, UriKind.Relative));

                if (source == assemblyName)

                {

                    asm = asmPart.Load(streamInfo.Stream);

                }

                else

                {

                    asmPart.Load(streamInfo.Stream);

                }

            }

            return asm;

        }