public void BeforeSave()
{
SaveMap = new Dictionary <Type, List <EntityInfo> >();
EntityInfoGroups.ForEach(eg => {
var entityInfos = eg.EntityInfos.Where(ei => ContextProvider.BeforeSaveEntity(ei)).ToList();
SaveMap.Add(eg.EntityType, entityInfos);
});
SaveMap = ContextProvider.BeforeSaveEntities(SaveMap);
EntitiesWithAutoGeneratedKeys = SaveMap
.SelectMany(eiGrp => eiGrp.Value)
.Where(ei => ei.AutoGeneratedKey != null && ei.EntityState != EntityState.Detached)
.ToList();
}