Fluent NHibernate
Editing StandardMappingCollectionTypes

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[[!include StandardMappingMenu]]

There are several collection types available for use in [relationships](StandardMappingRelationships) with Fluent NHibernate.

The collection type you've used in your entity will affect how Fluent NHibernate maps that property. If you're using an `ISet` from [Iesi.Collections](http://monogis.org/monogis_doc/html/Iesi.Collections.html) then the collection will be mapped as a `set`, otherwise it will default to using a `bag`.

You can explicitly set what kind of collection you want to use with several methods we've provided.

<pre name="code" class="c-sharp">
HasMany(x =&gt; x.Customers)
  .AsList();

HasMany(x =&gt; x.Customers)
  .AsSet();

HasMany(x =&gt; x.Customers)
  .AsBag();

HasMany(x =&gt; x.Customers)
  .AsMap();

HasMany(x =&gt; x.Customers)
  .AsArray();</pre>

Also, if you're using a custom collection type, Fluent NHibernate will automatically inform NHibernate of it; however, if you're using a custom type that's hidden behind an interface, then you'll still have to specify it with `CollectionType`.

<pre name="code" class="c-sharp">
HasMany(x =&gt; x.Customers)
  .CollectionType&lt;CustomCollectionType&gt;();</pre>

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