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 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: }

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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: 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: }

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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: }

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