MEF - Two way import and export - events

Question

I'm using MEF in order to execute plugins code in my project.
1. I'm loading my dll sources :
public void AssembleComponents()
{
try
{
//Creating an instance of aggregate catalog. It aggregates other catalogs
var aggregateCatalog = new AggregateCatalog();
//Build the directory path where the parts will be available
var directoryPath =
string.Concat(Path.GetDirectoryName(Assembly.GetExecutingAssembly().CodeBase)
.Split('\\').Reverse().Skip(4).Reverse().Aggregate((a, b) => a + "\\" + b)
, "\\", "ExportComponents\\Components");
string localPath = new Uri(directoryPath).LocalPath;
//Load parts from the available dlls in the specified path using the directory catalog
var directoryCatalog = new DirectoryCatalog(localPath, "*.dll");
//Load parts from the current assembly if available
var asmCatalog = new AssemblyCatalog(Assembly.GetExecutingAssembly());
//Add to the aggregate catalog
aggregateCatalog.Catalogs.Add(directoryCatalog);
aggregateCatalog.Catalogs.Add(asmCatalog);
//Crete the composition container
var container = new CompositionContainer(aggregateCatalog);
// Composable parts are created here i.e. the Import and Export components assembles here
container.ComposeParts(this);
}
catch (Exception ex)
{
throw ex;
}
}
I'm going through my plugins and executing a "Validate" method :
public List<string> Validate(string operationType)
{
List<string> res = null;
foreach (System.Lazy<IValidationRules, IPluginMetadata> plugin in ChekcsPlugins)
{
if (plugin.Metadata.DisplayName == operationType)
{
res = plugin.Value.Validate();
break;
}
}
return res;
}
I'm know how to export back a returned value once the "Validate" is done but what i need is to return values at run time back during the method execution.
Is it possible?