Loading other xap in silverlight3

Sometimes we always want to use xap as the base point to achieve continuous integration when designing an integrated SL system. So what should we do?

Solution:

1. First, we need to use a method to extract the Assembly from the source Resource:

 
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 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. Use a WebClient to download the specified xap file. After the download is complete, use the preceding method to complete the loaded file as a uielement, so that we can use it.

 
1: void mainpage_loaded (Object sender, routedeventargs E)
 

 
2 :{
 

 
3: // Add the location of an xap File
 

 
4: URI address = new uri ("http: // localhost: 4456/clientbin/exproject. xap ");
 

 
5: // A WebClient of the Instance
 

 
6: WebClient = new WebClient ();
 

 
7: // register a download completion event
 

 
8: WebClient. openreadcompleted + = new openreadcompletedeventhandler (webclient_openreadcompleted );
 

 
9: // start download
 

10: WebClient. openreadasync (Address );
 

 
11 :}
 

3. After the download is complete, use the loadassemblyfromxap method to restore xpa to uielement:

 
1: void webclient_openreadcompleted (Object sender, openreadcompletedeventargs E)
 

 
2 :{
 

 
3: 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 = 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 :}