What is a 'Bag' and a 'Set' in nHibernate?

Question

Using Fluent NHibernate, I come across the mapping AsBag() and AsSet() for HasMany and HasManyToMany relationships. I've done some searches, and I'm just not finding anything. Can anyone explain to me what these mean, and what the significance is?

possible duplicate of [set/bag and list/set in nhibernate](http://stackoverflow.com/questions/1916350/set-bag-and-list-set-in-nhibernate) — Vadim, May 02 '11 at 14:16

StuartLC · Accepted Answer · 2012-12-17T10:19:40.957

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The post here succinctly explains the differences.

In summary, they are both unordered collections:

Set => Item may not occur more than once
Bag => Items may occur more than once

edited Dec 17 '12 at 10:19

answered May 02 '11 at 13:49

StuartLC

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score 7 · Answer 2 · edited May 23 '17 at 10:34

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Check out this SO article: List vs Set vs Bag in NHibernate

edited May 23 '17 at 10:34

Community

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answered May 02 '11 at 13:48

Cole W

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score 0 · Answer 3 · edited May 02 '11 at 13:48

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Check out the mathematical concepts Set / Multiset (Bag) and see if they can push you into the right direction.

http://en.wikipedia.org/wiki/Set_(mathematics)

http://en.wikipedia.org/wiki/Multiset

edited May 02 '11 at 13:48

Daniel Hilgarth

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answered May 02 '11 at 13:46

m__

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What is a 'Bag' and a 'Set' in nHibernate?

3 Answers3