Entity Framework Classic Include
Include method lets you add related entities to the query result.
In EF Classic, the
Include method no longer returns an
IQueryable but instead an
IncludeDbQuery that allows you to chain multiple related objects to the query result by using the
ctx.Customers .Include(customer => customer.Orders) .ThenInclude(order => order.OrderDetails) .ThenInclude(orderDetail => orderDetail.Product) .AlsoInclude(product => product.Category) .AlsoInclude(product => product.Supplier) .ToList();
- If you want to include items from the same level, use
- If you want to include items from the next level, use
Chaining includes only work if the first include call is from a
DbQuery. If you used some LINQ and the query is currently an
IQueryable, you can use the method
AsDbQuery to tell the compiler that's a
This restriction is currently required to avoid some side impact with queries that are not directly using the
ctx.OrderDetails .Where(orderDetail => orderDetail.Quantity > 1) .AsDbQuery() .Include(orderDetail => orderDetail.Product) .AlsoInclude(product => product.Category) .AlsoInclude(product => product.Supplier) .ToList();
It's planned to remove this limitation.