SilverLight中调用自定义用户控件

最新推荐文章于 2025-04-09 14:58:38 发布

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最新推荐文章于 2025-04-09 14:58:38 发布

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分类专栏： silverlight学习文章标签： silverlight assembly application microsoft object string

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本文介绍两种在ASP.NET页面中动态加载不同Silverlight控件的方法。第一种方法通过修改Silverlight项目的启动文件来实现控件切换；第二种方法则演示了如何在运行时通过代码动态加载不同的Silverlight项目。

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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

</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

</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;

}

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