I’ve made a very simple MEF sample which runs on .NET, but doesn’t work

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Asked: May 11, 20262026-05-11T06:13:37+00:00 2026-05-11T06:13:37+00:00

I’ve made a very simple MEF sample which runs on .NET, but doesn’t work

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I’ve made a very simple MEF sample which runs on .NET, but doesn’t work properly on Mono.

using System; using System.Collections.Generic; using System.Text; using System.ComponentModel.Composition;  namespace Vialis {     class Program     {         [Import(typeof(ILedController))]         public List<ILedController> Controllers         {             get;             set;         }          static void Main(string[] args)         {             new Program();         }          public Program()         {             compose();             selectController();              Console.ReadLine();         }          private void compose()         {             var catalog = new DirectoryPartCatalog('controllers');             var container = new CompositionContainer(catalog);              container.AddPart(this);             container.Compose();         }          private void selectController()         {             Console.Clear();             Console.WriteLine('Please select the controller to use\n');              byte i = 0;              foreach (var controller in Controllers)             {                 Console.WriteLine('\t{0}) {1}', i, controller.ToString());                 i++;             }              Console.Write('\nYour selection: ');             var input = Convert.ToInt32(Console.ReadLine());              Controllers[input].DisplayText(10, 10, 'Hello World');         }     } }

This is the interface:

using System; using System.Collections.Generic; using System.Text;  namespace Vialis {     public interface ILedController     {         void DisplayText(int x, int y, string text);     } }

This is the first implementation:

using System; using System.Collections.Generic; using System.Text; using System.ComponentModel.Composition;  namespace Vialis {     [Export(typeof(ILedController))]     public class LyanController : ILedController     {         public void DisplayText(int x, int y, string text)         {             Console.SetCursorPosition(x, y);             Console.ForegroundColor = ConsoleColor.Red;             Console.WriteLine(text);         }     } }

The second implementation:

using System; using System.Collections.Generic; using System.Text; using System.ComponentModel.Composition;  namespace Vialis {     [Export(typeof(ILedController))]     public class VialisController : ILedController     {         public void DisplayText(int x, int y, string text)         {             Console.SetCursorPosition(x, y);             Console.ForegroundColor = ConsoleColor.Green;             Console.WriteLine(text);         }      } }

This is what happens on .NET (Windows):

.NET http://lh5.ggpht.com/_GWubgra2SwM/SXl-yoSRLtI/AAAAAAAADwI/sGR0FjLfg8Q/controller-selection-windows.jpg

Selecting the controllers:

.NET 1 http://lh3.ggpht.com/_GWubgra2SwM/SXl-yYzs-aI/AAAAAAAADwE/WomfaQqv_Xc/vialis-controller-windows.jpg

.NET 2 http://lh6.ggpht.com/_GWubgra2SwM/SXl-yE1Q-cI/AAAAAAAADwA/qznnEkiNokA/lyan-controller-windows.jpg

But using Mono 2.2 the assemblies don’t load:

Mono http://lh5.ggpht.com/_GWubgra2SwM/SXl-xw0YXOI/AAAAAAAADv8/7j2UxJott04/controller-selection-macos.jpg

Any suggestions ?

INFO: Google seems to be having some picasa web problems, that is why the images don’t load.

The pictures show you that on Mac OS, no controllers are listed.