public void SetAssignmentsRetriever(IAssignmentsRetriever assignmentsRetriever)
{
if (_assignmentsRetriever != null)
{
_assignmentsRetriever.OnAssignmentsRetrieved -=
ProcessOnAssignmentsRetrieved;
}
assignmentsRetriever.OnAssignmentsRetrieved +=
ProcessOnAssignmentsRetrieved;
_assignmentsRetriever = assignmentsRetriever;
}