c# - MEF not providing object -

update:

this mvc plugin project, using mef controllers , actions @ run time. http://www.fidelitydesign.net/?p=104

i added new project , in class added export of type being composed.

  [export(typeof(icontroller)), exportmetadata("name", "clocks")]   public class clockscontroller : controller   {      public xmlactionresult index()     {      var p = devicelogic.getunassigned;     }   [import(typeof(devicelogic))]   devicelogic devicelogic { get; set; }   } 

this gets composed in project:

  [export]   public class importcontrollerfactory : defaultcontrollerfactory   {     [importmany]     private ienumerable<partfactory<icontroller, icontrollermetadata>> controllerfactories;   } 

application start

[importmany] private ienumerable<importcontrollerfactory> controllerfactories; 

controller factories null, until compose parts

container.composeparts(this); 

thats working fine, decided try , emulate devicelogic appear in project im having trouble with.

i created emptry interface (iempty) testing , tried this:

  [export(typeof(iempty))]   public class requestprocessor : iempty   {      [import(typeof(devicelogic))]     devicelogic devicelogic { get; set; }   } 

and in applciation start added

[importmany] private ienumerable<iempty> testmef; 

this filled 1 instance after composition, seems have worked. question have suggestions why devicelogic null in requestprocessor not in clockscontroller.

you need call mef's satisfyimportsonce method after instantiation :

yourmefcontainter.satisfyimportsonce(datatransfer)