Basically I need something like a discriminator for arrays, because all arrays of ints need to be in one table. so if a class has two properties that both are arrays of ints I need to tell them apart.

I figured I would setup my table like this

intarray
id //class_id
property_name //name of property in class
value // int value
index // array index

However I can't figure out how to write the mapping for this. It doesn't need to exactly like this but all int arrays need to be in the same table.

Did you try using the where keyword on your collections? That should cause it to be filtered for you.

The where will work for retrieving them, but is not going to help with inserts

Ok, this is fair enough. To answer that then, I say don't map just a type of integers. Instead map your own type. Maybe you could even do something like this MyType<Int32>. Have a generic type with the properties which you need to manage the collection. Have a PropertName on the MyType class. Have a value property on there as well which is of the generic type. You could then map that type and have a collection of value types containing integers. This way it is somewhat close to what you want. You still have value type semantics, and you can use it with all of your types (integers, floating points, etc). You could still use the where clause for the retrieval, you'll just be responsible for setting the property name on the new type.