Diese Abfrage kompiliert wird ohne Fehler: var _entityList = context.customer .Join(context.applications, cust => cust.cust_id, app => app.cust_id, (cust, app) => new { customer = cust, application = app }) .Join(context.advices, cust => cust.application.app_id, sa => sa.app_id, (cust,