Hi all, I have a problem with generics, and I'm not sure if this scenario it is possible.

I have a class that represent my primary keys (PrimaryKey<T>) and I don't know how write it in the hbm file.

I have been looking for info and samples but I haven't found nothing.

Fragment code:

namespace MyNHibernateSample
{
public class MyEntity
{
private PrimaryKey<string> id_1;
private PrimaryKey<int?> id_2;

public PrimaryKey<string> Id_1
{....}

public PrimaryKey<int?> Id_2
{....}
}
}

namespace MyNHibernateSample
{
public class PrimaryKey<T>
{
private T oldKey;
private T mKey;

public PrimaryKey(T key)
{
this.mKey = key;
this.oldKey = key;
}

...........
}
}

Any help would be appreciated.

Best Regards.

Any chance this has been solved ? Looking to do something similar...

If I did understand what you want to do you could use the composite-id mapping with some kind of custom accesor (see default implementations or Ayende's generics accessor for NH 1.0).

If you can't find more info, I will try to give you more details tomorrow.

To clarify a bit (based on recent findings) ...

I have several generic entity classes that look like (greatly simplified)...

public class Foo<T>
{
protected string m_id;
protected string m_name;
protected T m_value;
protected IList<T> m_values;
public Foo()
{
Random rand = new Random();
m_values = new List<T>();
for (int i = 0; i < 10; i++)
{
m_values.Add(default(T));
}
}

public Foo(string _name, T _value) : this()
{
m_name = _name;
m_value = _value;
}

public virtual IList<T> Values
{
get { return m_values; }
set { m_values = value; }
}

public virtual string Id
{
get { return m_id; }
set { m_id = value; }
}

public virtual string Name
{
get { return m_name; }
set { m_name = value; }
}

public virtual T Value
{
get { return m_value; }
set { m_value = value; }
}
}

and I am trying to create a correct mapping file. There seems to be conflicting opinions regarding the general support of generics in 1.2RC1 (which may be caused by the close ties to Hib). Either way, there are suggestions out there that specify adding either '1 or '1[System.Int32] to the class name definition in the hbm file.

Then to confirm, I found a unit test in the NHib src (NHibernate.Test.GenericTest.Overall) that seemed to further suggest that a class declaration of <class name="A`1[System.Int32]" table="A"> in the hbm file should do the trick (at least for cases when <T> = <int> -- baby steps :-) ...

That was until I saw this in the unit test ...

[Ignore( "Generic entities not supported" )]

So I am back to the beggining, wondering if there is support for generic classes or just for generic lists ?

Thanks in advance...

Jeff

Currently only generic collections are supported. Generic entities are not.