CODEWITHSUNDEEP
.netwpfprismunity-container
Dave
Dave

Reputation: 1062

PRISM + Unity - Issue loading dynamic set of modules

I keep getting the error below, and have been unable to figure it out. I am wondering if anyone can assist.

Error: Failed to load type for module MyExternalAssembly.MyNamespace.MyModule.

If this error occurred when using MEF in a Silverlight application, please ensure that the CopyLocal property of the reference to the MefExtensions assembly is set to true in the main application/shell and false in all other assemblies.

Error was: Unable to retrieve the module type MyExternalAssembly.MyNamespace.MyModule, MyExternalAssembly.MyNamespace, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null from the loaded assemblies. You may need to specify a more fully-qualified type name..

Code:

Load Screen (loads modules, stores Assembly reference for various uses)

    string[] dynamicLibraries = Directory.GetFiles(pluginDirectory, "*.dll", SearchOption.AllDirectories);

    // Parse through the DLL's and look for types that implement "IModule".
    foreach (string file in dynamicLibraries)
    {
        // Get the plugin assembly information.
        Assembly plugin = Assembly.LoadFile(file);

        // Get all types that are exported for plugins.
        IEnumerable<Type> modules = plugin.GetTypes()
            .Where(t => typeof(IModule).IsAssignableFrom(t));

        if (modules.Count() > 0)
        {
            ApplicationState.Instance.Plugins.Add(plugin, modules);
        }
    }

Here is the ConfigureModuleCatelog Method

protected override void ConfigureModuleCatalog()
{
    base.ConfigureModuleCatalog();

    ModuleCatalog catalog = (ModuleCatalog)this.ModuleCatalog;

    foreach (var assembly in ApplicationState.Instance.Plugins)
    {
        foreach (var type in assembly.Value)
        {
            this.ModuleCatalog.AddModule(new ModuleInfo
            {
                ModuleName = type.FullName,
                ModuleType = type.AssemblyQualifiedName,
                Ref = new Uri(assembly.Key.Location, UriKind.RelativeOrAbsolute).AbsoluteUri,
                InitializationMode = InitializationMode.WhenAvailable
            }); 
        }
    }
}

Basically, I need a way to maintain/use this "Plugin" dictionary and get Modularization to wprk properly. And ideas?

Thanks!

Upvotes: 2

Views: 1860

Answers (1)

Kent Boogaart
Kent Boogaart

Reputation: 178650

I'm confused. You say Unity but then your code is using MEF types. And if you're using MEF, why on Earth are you manually finding IModule implementations - you should be using MEF to do the dynamic resolution for you.

Upvotes: 1

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