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copied!<p>Check my answer here.</p> <p><a href="http://codebetter.com/blogs/glenn.block/archive/2008/11/12/mvp-with-mef.aspx" rel="nofollow noreferrer">http://codebetter.com/blogs/glenn.block/archive/2008/11/12/mvp-with-mef.aspx</a> </p> <p>EDIT: (<em>Added from the link, to prevent not being flagged as low quality / LOA</em>)</p> <pre><code> 1: using System.ComponentModel.Composition; 2: using System.Reflection; 3: using Microsoft.VisualStudio.TestTools.UnitTesting; 4: 5: namespace MVPwithMEF 6: { 7: /// <summary> 8: /// Summary description for MVPTriadFixture 9: /// </summary> 10: [TestClass] 11: public class MVPTriadFixture 12: { 13: [TestMethod] 14: public void MVPTriadShouldBeProperlyBuilt() 15: { 16: var catalog = new AttributedAssemblyPartCatalog(Assembly.GetExecutingAssembly()); 17: var container = new CompositionContainer(catalog.CreateResolver()); 18: var shell = container.GetExportedObject<Shell>(); 19: Assert.IsNotNull(shell); 20: Assert.IsNotNull(shell.Presenter); 21: Assert.IsNotNull(shell.Presenter.View); 22: Assert.IsNotNull(shell.Presenter.Model); 23: } 24: } 25: 26: [Export] 27: public class Shell 28: { 29: private IPresenter _presenter = null; 30: 31: public IPresenter Presenter 32: { 33: get { return _presenter; } 34: } 35: 36: [ImportingConstructor] 37: public Shell(IPresenter presenter) 38: { 39: _presenter = presenter; 40: } 41: } 42: 43: public interface IModel 44: { 45: } 46: 47: [Export(typeof(IModel))] 48: public class Model : IModel 49: { 50: 51: } 52: 53: public interface IView 54: { 55: } 56: 57: [Export(typeof(IView))] 58: public class View : IView 59: { 60: } 61: 62: public interface IPresenter 63: { 64: IView View { get;} 65: IModel Model { get; } 66: } 67: 68: [Export(typeof(IPresenter))] 69: public class Presenter : IPresenter 70: { 71: 72: private IView _view; 73: private IModel _model; 74: 75: [ImportingConstructor] 76: public Presenter(IView view, IModel model) 77: { 78: _view = view; 79: _model = model; 80: } 81: 82: public IView View 83: { 84: get { return _view; } 85: } 86: 87: public IModel Model 88: { 89: get { return _model; } 90: } 91: 92: } 93: } </code></pre> <p>So what’s going on here?</p> <p>Shell gets injected with Presenter. Presenter gets injected with View and Model. Everything here is singletons, but doesn’t have to be.</p> <p>The difference between our two examples is that the Presenter is getting injected into the shell rather than the View. If the Presenter is creating the View then you can’t just grab the View first (as he was doing), or the Presenter will not get created. Well you can do it, but you end up hacking it to bits. Cleaner is to just inject the Presenter and have it expose an IView. We did this in Prism and it worked quite well.</p>

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