C # uses MEF to dynamically load different UserControl and implement communication between different UserControl

1, first in the project reference to add: System.ComponentModel.Composition and Bbv.Common.EventBroker

Where Bbv.Common.EventBroker referenced DLL library in http://sourceforge.net/projects/bbvcommon/ can be downloaded, if not get, can leave a message with me, I provide to everyone.
：

2, the specific Code implementation 1), the main form code:

 Public partial class Frmmain:form {private void Initmef () {Aggregatecatalog aggregatecata Log = new Aggregatecatalog ();//Declares a collection Assemblycatalog Assemblycatalog = new Assemblycatalog (Assembly.getexecuti            Ngassembly ());//declares the current application's catalog aggregateCatalog.Catalogs.Add (assemblycatalog);//Adds the current application's catalog to the collection Compositioncontainer Compositioncontainer = new Compositioncontainer (aggregatecatalog);//Declare a container compositio Ncontainer.composeparts (this);//Create Component} [Import ("user")] private usercontroltest usercontr        oltest {set; get;}            Public Frmmain () {InitializeComponent (); INITMEF ();//Initialize MEF Panel1.            Controls.clear (); Panel1.            Controls.Add (usercontroltest);            Eventbroker eventbroker = new Eventbroker ();            Eventbroker.register (usercontroltest);                   Eventbroker.register (this); } [EventsubscriptIon (Eventtopics.firstevent, typeof (Background))] public void Receiver (object obj, EventArgs args) {            System.Threading.Thread.Sleep (3000);        MessageBox.Show ("received the message"); The private void Timer1_Tick (object sender, EventArgs e) {Label1.        Text = DateTime.Now.ToString ("hh:mm:ss.fff"); }    }

2) UserControl Code:

[Export ("User")]    public partial class Usercontroltest:usercontrol    {public        usercontroltest ()        {            InitializeComponent ( );        }        [Eventpublication (eventtopics.firstevent)]        public event EventHandler TestEvent;        private void btnTest_Click (object sender, EventArgs e)        {            testevent (this,eventargs.empty);            System.Threading.Thread.Sleep (+);        }    }

3) EventTopics.cs Code:

public class Eventtopics    {public       const string firstevent = "Test";    }

C # uses MEF to dynamically load different UserControl and implement communication between different UserControl