2015-07-24-how-to-automatically-load-navigation-properties-in-entity-framework_003.cs

public virtual IQueryable<TEntity> FindAll(Expression<Func<TEntity, bool>> where = null) 
{
 IQueryable<TEntity> query = where == null ? this.Context.Set <TEntity> () : this.Context.Set<TEntity>().Where(where);

 var workspace = ((IObjectContextAdapter)this.Context).ObjectContext.MetadataWorkspace;
 var itemCollection = (ObjectItemCollection)(workspace.GetItemCollection(DataSpace.OSpace));
 var entityType = itemCollection.OfType<EntityType>().FirstOrDefault(e => itemCollection.GetClrType(e) == typeof(TEntity));

 if (entityType != null) 
 {
  foreach(var navigationProperty in entityType.NavigationProperties) 
  {
   query = query.Include(navigationProperty.Name);
  }
 }

 return query;
}