Only a comment about "not require Iesi".

The framework 2.0 does not have a collection for set semantic.
The framework 3.5 has a collection for set semantic but does have an
interface for that kind of collection (GOF: program to interface not to
implementation).
The framework 4.0 will have an interface ISet for set semantic.

After around 9 years, somebody in Microsoft has understood that a collection
supporting the set-semantic is needed: late is better than never.

Iesi.Collection is not evil, it is only a missed collection supported by
.NET itself.

2010/1/27 Daoming Yang <[email protected]>

> Hi all,
>
> I have been using set and bag in my application. I have the
> basic knowledge of bag (allow duplicated items) and set (not allow
> duplicated items and unordered). 
> Someone<https://forum.hibernate.org/viewtopic.php?p=2390190> said
> the bag is inefficient.
>
> However, I don't really know which one I should really implement. I have a
> feeling use bag with IList will be easy and it does not require to add the
> Iesi.
>
> Can anyone provide some of your thoughts?
>
> Regards,
>
> Daoming
>
>
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-- 
Fabio Maulo

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