private void LoadPackage(Stream xapStream, ExtensionLink link, Action actionWhenExtensionLoaded = null)
{
string xapFileName = String.Format("{0}.xap", link.Package);
string assemblyKey = System.IO.Path.ChangeExtension(xapFileName, null);
List <Assembly> assemblies = XapHelper.LoadPackageAssemblies(xapStream);
foreach (var assembly in assemblies)
{
var assemblyName = assembly.FullName.Substring(0, assembly.FullName.IndexOf(','));
if (assemblyName.Equals(assemblyKey))
{
var obj = assembly.CreateInstance(String.Format("{0}.Extension", assemblyKey));
link.Extension = obj as Extension;
if (_extensionLoaded != null)
{
_extensionLoaded(this, new ExtensionEventArgs(obj as Extension));
}
if (actionWhenExtensionLoaded != null)
{
actionWhenExtensionLoaded();
}
break;
}
}
}
/// <summary>
/// Loads an extension if not already loaded.
/// </summary>
/// <param name="link">The ExtensionLink object.</param>
public void CheckExtension(ExtensionLink link, Action actionWhenExtensionLoaded = null)
{
if (link.Extension == null)
{
string xapFileName = String.Format("{0}.xap", link.Package);
if (Application.Current.IsRunningOutOfBrowser)
{
// loads package from the isolated storage
using (var store = IsolatedStorageFile.GetUserStoreForApplication())
{
// TODO : check for update on the server
using (IsolatedStorageFileStream xapStream =
new IsolatedStorageFileStream(
xapFileName, FileMode.Open, store))
{
LoadPackage(xapStream, link);
}
}
}
else
{
// loads package from the server
Uri xapUri = new Uri(xapFileName, UriKind.RelativeOrAbsolute);
WebClient webClient = new WebClient();
webClient.OpenReadCompleted +=
(sender, e) =>
{
Stream xapStream = e.Result;
try
{
LoadPackage(xapStream, link, actionWhenExtensionLoaded);
}
finally
{
xapStream.Close();
}
};
webClient.OpenReadAsync(xapUri);
}
}
}
