public INativeHandleContract LoadPlugin(string assembly, string typeName)
{
if (String.IsNullOrEmpty(assembly)) throw new ArgumentNullException("assembly");
if (String.IsNullOrEmpty(typeName)) throw new ArgumentNullException("typeName");
Console.WriteLine("Loading plugin {0},{1}", assembly, typeName);
try
{
Func<string, string, INativeHandleContract> createOnUiThread = CreateOnUiThread;
var contract = (INativeHandleContract)Program.Dispatcher.Invoke(createOnUiThread, assembly, typeName);
var insulator = new NativeHandleContractInsulator(contract);
return insulator;
}
catch (Exception ex)
{
var message = String.Format("Error loading type '{0}' from assembly '{1}'. {2}",
assembly, typeName, ex.Message);
throw new ApplicationException(message, ex);
}
}
private static IPlugin CreateOnUiThread(string assembly, string typeName)
{
var handle = Activator.CreateInstance(assembly, typeName);
if (handle == null) throw new InvalidOperationException("Activator.CreateInstance() returned null");
var obj = handle.Unwrap();
if (obj == null) throw new InvalidOperationException("Unwrap() returned null");
if (!(obj is FrameworkElement))
{
var message = string.Format("Object of type {0} cannot be loaded as plugin " +
"because it does not derive from FrameworkElement", typeName);
throw new InvalidOperationException(message);
}
var element = (FrameworkElement)obj;
var contract = FrameworkElementAdapters.ViewToContractAdapter(element);
var insulator = new NativeHandleContractInsulator(contract);
var plugin = new PluginBase(insulator, element);
return plugin;
}
