Silverlight3 加载其他xap

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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. 1:  Assembly LoadAssemblyFromXap(Stream packageStream, String assemblyName)
   
2. 2:          {
   
3. 3:              StreamResourceInfo resouceInfo = new StreamResourceInfo(packageStream, "application/binary");
   
4. 4:              Stream mainfestStream = Application.GetResourceStream(resouceInfo, new Uri("AppManifest.xaml", UriKind.Relative)).Stream;
   
5. 5:              String appManifestString = new StreamReader(mainfestStream).ReadToEnd();
   
6. 6: 
   
7. 7:              XElement deploymentRoot = XDocument.Parse(appManifestString).Root;
   
8. 8:              List<XElement> deploymentParts = (from assemblyParts in deploymentRoot.Elements().Elements() select assemblyParts).ToList();
   
9. 9: 
   
10. 10:              Assembly targetassembly = null;
    
11. 11: 
    
12. 12:              foreach (XElement xElement in deploymentParts)
    
13. 13:              {
    
14. 14:                  String source = xElement.Attribute("Source").Value;
    
15. 15:                  if (source == assemblyName)
    
16. 16:                  {
    
17. 17:                      StreamResourceInfo streamInfo = Application.GetResourceStream(resouceInfo, new Uri(source, UriKind.Relative));
    
18. 18:                      AssemblyPart asmPart = new AssemblyPart();
    
19. 19:                      targetassembly = asmPart.Load(streamInfo.Stream);
    
20. 20:                  }
    
21. 21:              }
    
22. 22:              return targetassembly;
    
23. 23:          }
    

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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. 1:  void MainPage_Loaded(object sender, RoutedEventArgs e)
   
2. 2:  {
   
3. 3:      //加一个xap文件所在的位置
   
4. 4:      Uri address = new Uri("http://localhost:4456/ClientBin/exproject.xap");
   
5. 5:      //实例一个webClient
   
6. 6:      WebClient webClient = new WebClient();
   
7. 7:      //注册一个下载完成事件
   
8. 8:      webClient.OpenReadCompleted += new OpenReadCompletedEventHandler(webClient_OpenReadCompleted);
   
9. 9:    //开始下载
   
10. 10:      webClient.OpenReadAsync(address);
    
11. 11:  }
    

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

1. 1:  void webClient_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
   
2. 2:  {
   
3. 3:      Stream stream = Application.GetResourceStream(
   
4. 4:          new StreamResourceInfo(e.Result, null),
   
5. 5:          new Uri("AppManifest.xaml", UriKind.Relative)).Stream;
   
6. 6:      String appManifestString = new StreamReader(stream).ReadToEnd();
   
7. 7: 
   
8. 8:      Assembly assembly = LoadAssemblyFromXap(e.Result, "exproject.dll");//other project name.dll
   
9. 9:      UIElement element = assembly.CreateInstance("exproject.MainPage") as UIElement;//other project name.mainPage
   
10. 10:      this.contaner.Children.Add(element);
    
11. 11:  }
    

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