How to delete slave entity in entity framework poco in one line?

The following code:

order.Orderlines.Remove(orderline)

Means not only to remove relationship between Order and Orderline but also to remove orderline from persistence permanently. Many slave entities have this situation.

As I know, in entity fra开发者_开发问答mework have to write extra code:

context.DeleteObject(orderline);

Or,

context.Orderlines.DeleteObject(orderline);

So, the remove rule can't be encapsulated entirely in order itself.

Any better choice for one line deletion in entity framework?

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It's not entirely clear to me what you are asking, but here is a very complete description of various scenarios for deleting related entities, which will hopefully answer your question.