c# - mef - how to make recomposition work automatically? -

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i've been trying recomposition work no luck... tried many times , many approches - no luck... can point out mistake? expect after drop new .dll plugins directory senders collection automatically repopulated new stuff...

//exported classes [export(typeof(isender))] public class smtp : isender {     public string name     {         { return "smtp plugin"; }     }      public void send(string msg)     {      } }  [export(typeof(isender))] public class exchange : isender {     public string name     {         { return "exchange plugin"; }     }      public void send(string msg)     {         // .. blah     } }

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/// <summary> /// interaction logic mainwindow.xaml /// </summary> public partial class mainwindow : window {     private const string str_pugins = ".\\plugins";       [importmany(typeof(isender), allowrecomposition = true)]     private list<isender> senders;      private directorycatalog d;     compositioncontainer c;      public mainwindow()     {         initializecomponent();         listbox1.displaymemberpath = "name";          configplugins();         bindsenders();     }      private void configplugins()     {         directoryinfo dir = new directoryinfo(str_pugins);          if (!dir.exists)             dir.create();          d = new directorycatalog(str_pugins);         d.changed += new eventhandler<composablepartcatalogchangeeventargs>(d_changed);         c = new compositioncontainer(d);         c.exportschanged += new eventhandler<exportschangeeventargs>(c_exportschanged);          c.composeparts(this);     }      void d_changed(object sender, composablepartcatalogchangeeventargs e)     {         bindsenders();         messagebox.show("d_changed " + (senders == null ? 0 : senders.count));     }      private void bindsenders()     {         listbox1.itemssource = senders;     }      void c_exportschanged(object sender, exportschangeeventargs e)     {         bindsenders();         messagebox.show("c_exportschanged "+ (senders == null ? 0 : senders.count));     } }




after response ok, i've added refresh, still don't why listbox won't populate new data...

public partial class mainwindow : window {     private const string str_pugins = ".\\plugins";       [importmany(typeof(isender), allowrecomposition = true)]     private list<isender> senders;      directorycatalog d;     compositioncontainer c;      public mainwindow()     {         initializecomponent();         listbox1.displaymemberpath = "name";          configplugins();         bindsenders();     }      private void configplugins()     {         directoryinfo dir = new directoryinfo(str_pugins);          if (!dir.exists)             dir.create();          d = new directorycatalog(str_pugins);         c = new compositioncontainer(d);          c.composeparts(this);     }      private void bindsenders()     {         label1.datacontext = senders;         listbox1.itemssource = senders;     }      private void button1_click(object sender, routedeventargs e)     {         d.refresh();         bindsenders();     } }

you have call refresh yourself. if want can use filesystemwatcher object notified when directory contents have changed.


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