I've just abandoned my own implementation of a Persistence Framework and jumped on the NHibernate bandwagon, and one thing I had there were also Nullable Types. What I miss in these Nullables is the Parse feature. For instance, my decimal implementation for DecimalDB was:

Public Shared Function Parse(ByVal s As String) As DecimalDB
Parse = New DecimalDB

If s Is Nothing Then
Parse.SetValue(System.DBNull.Value)
Else
If Trim(s) = "" Then
Parse.SetValue(System.DBNull.Value)
Else
Try
Parse.SetValue(Decimal.Parse(s))
Catch ex As System.Exception
Throw New FormatException(ex.Message)
End Try
End If
End If
End Function

So, Nothing or empty string would parse as a null value, anything else would be the result of Decimal.Parse. Would anyone consider adding this or will I have to subclass? (probably will anyway for timing reasons :wink: )

Can you create a Jira issue for this improvement? (here: http://jira.nhibernate.org/)

I'm sure that one of us will find the time to do it before the 1.0 release.

Anyway, you can do it and post the patchs (don't forget the tests ;) )

Ok, I've created the issue. I'll give it a shot, also.

Thanks!