silverlight3 加载其他xap

有些时候我们在设计有集成sl系统的时候总会想把xap作为基点来达到持续集成的效果。那么我们应该怎么做呢？

解决方法:

1.首先我们要用一个方法实现从源资中提取出Assembly:

 1:  Assembly LoadAssemblyFromXap(Stream packageStream, String assemblyName)

 2:          {

 3:              StreamResourceInfo resouceInfo = new StreamResourceInfo(packageStream, "application/binary");

 4:              Stream mainfestStream = Application.GetResourceStream(resouceInfo, new Uri("AppManifest.xaml", UriKind.Relative)).Stream;

 5:              String appManifestString = new StreamReader(mainfestStream).ReadToEnd();

 6:  

 7:              XElement deploymentRoot = XDocument.Parse(appManifestString).Root;

 8:              List<XElement> deploymentParts = (from assemblyParts in deploymentRoot.Elements().Elements() select assemblyParts).ToList();

 9:  

10:              Assembly targetassembly = null;

11:  

12:              foreach (XElement xElement in deploymentParts)

13:              {

14:                  String source = xElement.Attribute("Source").Value;

15:                  if (source == assemblyName)

16:                  {

17:                      StreamResourceInfo streamInfo = Application.GetResourceStream(resouceInfo, new Uri(source, UriKind.Relative));

18:                      AssemblyPart asmPart = new AssemblyPart();

19:                      targetassembly = asmPart.Load(streamInfo.Stream);

20:                  }

21:              }

22:              return targetassembly;

23:          }

2.利用一个webClient下载指定的其他xap文件，并在下载完成后，利用上边的方法把加载后的资料还完成一个UIElement,这样我们就可以使用了.

 1:  void MainPage_Loaded(object sender, RoutedEventArgs e)

 2:  {

 3:      //加一个xap文件所在的位置

 4:      Uri address = new Uri("http://localhost:4456/ClientBin/exproject.xap");

 5:      //实例一个webClient

 6:      WebClient webClient = new WebClient();

 7:      //注册一个下载完成事件

 8:      webClient.OpenReadCompleted += new OpenReadCompletedEventHandler(webClient_OpenReadCompleted);

 9:     //开始下载

10:      webClient.OpenReadAsync(address); 

11:  }

3.下载完成后通过LoadAssemblyFromXap方法还原xpa为UIElement:

 1:  void webClient_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)

 2:  {

 3:      Stream stream = Application.GetResourceStream(

 4:           new StreamResourceInfo(e.Result, null),

 5:           new Uri("AppManifest.xaml", UriKind.Relative)).Stream;

 6:      String appManifestString = new StreamReader(stream).ReadToEnd();

 7:  

 8:      Assembly assembly = LoadAssemblyFromXap(e.Result, "exproject.dll");//other project name.dll 

 9:      UIElement element = assembly.CreateInstance("exproject.MainPage") as UIElement;//other project name.mainPage 

10:      this.contaner.Children.Add(element);

11:  }