Type mismatch in NHibernate.Criterion.SimpleExpression

northdevil · **Joined:** Sat May 23, 2009 12:16 pm **Posts:** 2

I have a type named CodeText for some special properties and I create a type named CodeTextUserType implemented IUserType to support my type for hibernate, and my mapping file like this:
<property name="Gender" type="xxx.xxx.CodeTextUserType" />

Everything does well except using Expression:
cri.Add(Expression.Eq("Gender", new CodeText("01")));
I got an exception "Type mismatch in NHibernate.Criterion.SimpleExpression: Gender expected type xxx.xxx..CodeTextType, actual type xxx.CodeText"

I can not change code new CodeText("01") to code new CodeTextUserType("01") because it looks so strange and CodeTextUserType don't have that constructor.

I know that I can make CodeText to implement IUserType instead of CodeTextUserType to resolve this problem, but I just do not want my type to depend on NHibernate. If I do so, my domains project must have the reference to Nhibernate.
so, want shall i do?

wolli · **Posted:** Mon May 25, 2009 3:32 am

What does your ReturnedType property looks like ? Afaik it should be

Code:

       public virtual Type ReturnedType
        {
            get { return typeof( CodeText ); }
        }

and your error sounds like you return typeof(CodeTextUserType) there.

northdevil · **Joined:** Sat May 23, 2009 12:16 pm **Posts:** 2

wolli wrote:

What does your ReturnedType property looks like ? Afaik it should be

Code:

       public virtual Type ReturnedType
        {
            get { return typeof( CodeText ); }
        }

and your error sounds like you return typeof(CodeTextUserType) there.

Thanks for your reply very much, that is the real reason.