I am running into an nHibernate error while saving an object.
The classes involved are:
interface IHardwareSpecification
{
//fields and methods
}
public c开发者_C百科lass CPUSpecification : IHardwareSpecification
{
//fields and methods
}
public class SystemTransaction
{
//Bunch of other fields
private IHardwareSpecification _specs;
public virtual IHardwareSpecification Specification
{
get { return _specs; }
set { _specs = value;}
}
}
Mapping:
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" ...>
<class name="SystemTransaction" table="SystemTransactions" lazy="false">
<component access="field.camelcase-underscore" name="Specification"
class="HardwareMarketplace.Model.CPUSpecification">
<property access="field.camelcase-underscore" column="Specification_Rate"
name="Rate"/>
...
</component>
</class>
</hibernate-mapping >
While persisting the object to database via Save, I get the following error:
Exception: Unable to cast object of type 'Castle.Proxies.IHardwareSpecificationProxy' to type 'Hardwaremarketplace.Model.SystemTransactions.CPUSpecification'.
I am trying to figure out how to resolve this so any help will be appreciated. f
Based on your comment I understand that AutoMapper creates proxy type for interface property Specification
.
Thus you have:
public class CPUSpecification : IHardwareSpecification { }
and
public class IHardwareSpecificationProxy : IHardwareSpecification{ }
These are two incompatible types and IHardwareSpecificationProxy
object cannot be converted to CPUSpecification
.
What you need to do is to tell AutoMapper to use CPUSpecification
class instead of dynamic proxy.
Edit:
Considering you have CPUSpecificationDTO
inside SystemTransactionDTO
, you can achieve what you need with the following code:
Mapper.CreateMap<SystemTransactionDTO, SystemTransaction>();
Mapper.CreateMap<CPUSpecificationDTO, CPUSpecification>();
Mapper.CreateMap<CPUSpecificationDTO, IHardwareSpecification>()
.ConvertUsing(dto => Mapper.Map<CPUSpecificationDTO, CPUSpecification>(dto));
And no need to change Specification
property type to CPUSpecification
:).
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