mef

I have a question about the Singleton Pattern and MEF. I'm new in implementing MEF Plugins and I haven't found an answer. Is it possible to provide only one instance of a class through a MEF implemented Plugin? My old class is something like this: #region Singleton /// /// This class provide a generic and thread-safe interface for Singleton classes. /// /// The specialized singleton which is derived /// from SingletonBase<T> public abstract class Base where T : Base { /* the lock object */ private static object _lock = new object(); /* the static instance */ private static T _instance = null;

I have a static class in my solution which is used to work with various assemblies. I want to link them through MEF, so I made a field in a class. [Import(typeof(A))] static private A _a1; Then I have a method to which I pass assembly name as an argument: public static A LoadPackage(string filePath) { var catalog = new AggregateCatalog(); catalog.Catalogs.Add(new AssemblyCatalog(filePath)); var _container = new CompositionContainer(catalog); ??? } So is there a way now to import type from assembly specified by filepath? I can't do: _container.ComposeParts(this); since class is `static and

How is it possible to re-use and compose parts in CM managed windows? I have found posts regarding using two UserControls to bind to the same ViewModel, but not so much if I want to have multiple views and viewmodels all composed in the same window. (a viewmodel for each view composed into a "master view") The first part of my question would be how to break up components for re-use? If I have two areas of a window where one is a datagrid and another is a details view with labels and text boxes should these be in separate usercontrols, customcontrols or windows? Each one would ideally be stand

I found old article called LearnVSXNow and part #30 - Custom Editors in Visual Studio . There is sample project The Blog Item Editor which shows how to make custom file type assigned with custom UI editor for this file type extension (.blit) This sample uses project VSXtra , which is written for Visual Studio 2008 . Can someone point me to some tutorial, how-to, or something how to do the same for Visual Studio 2010 ? My goal is to register custom file type extension (e.g. *.myext1) within visual studio 2010, and assign my own custom UI designer (WinForms, derived from UserControl) to handle

I'm using MEF and the System.ComponentModel.Composition.dll to load some dll. I'm doing something like : AggregateCatalog catalog = new AggregateCatalog(new AssemblyCatalog(Assembly.GetExecutingAssembly()), new DirectoryCatalog(directory)); _container = new CompositionContainer(catalog); _container.ComposeParts(this); to import my dll. After some times, I would like to update my dll but if I try to delete it, I have an access denied, because it's alrealdy used by the program. How can I release the dll, replace with a new dll and load the dll again ? (without closing the program) Thanks in

I have a AggregateCatalog that contains an AssemblyCatalog and a DirectoryCatalog. I want them to work like this: If both catalogs can find an export, choose the one from the DirectoryCatalog. If neither of them can find an export, then just leave the import to be null. If only one of them can find an export, then just use that export to fill the import. How can I achieve something like this? You can achieve point 1. and 3. by putting the catalogs in different export providers, and then passing the export providers to the CompositionContainer constructor in order of priority like this: var