I’m setting up a mapping between some nice, light weight POCOs and some big

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Asked: May 28, 20262026-05-28T21:27:34+00:00 2026-05-28T21:27:34+00:00

I’m setting up a mapping between some nice, light weight POCOs and some big

0

I’m setting up a mapping between some nice, light weight POCOs and some big fat heavy data aware objects that are part of a legacy architecture.

The data objects are using SqlTypes for their properties – so I’ve got Data.Role.Name as SqlString but Poco.Role.Name as string.

Automapper is set up as such:

Mapper.CreateMap<Role, Data.Role>()
    .ForMember(dest => dest.Role_ID, 
                opt => opt.MapFrom(src=>src.ID));

On the attempt to map Mapper.Map(pocoRole, dataRole), the exception (scroll down) is thrown.

How can I cause Automapper to map from string to sqlstring gracefully?

AutoMapper.AutoMapperMappingException : Trying to map Poco.Role to Data.Role.
Using mapping configuration for Poco.Role to Data.Role
Exception of type 'AutoMapper.AutoMapperMappingException' was thrown.
  ----> AutoMapper.AutoMapperMappingException : Trying to map System.String to System.Data.SqlTypes.SqlString.
Using mapping configuration for Poco.Role to Data.Role
Destination property: Name
Exception of type 'AutoMapper.AutoMapperMappingException' was thrown.
  ----> AutoMapper.AutoMapperMappingException : Trying to map System.String to System.Data.SqlTypes.SqlString.
Using mapping configuration for Poco.Role to Data.Role
Destination property: Name
Exception of type 'AutoMapper.AutoMapperMappingException' was thrown.
  ----> AutoMapper.AutoMapperMappingException : Trying to map System.String to System.Data.SqlTypes.SqlString.
Using mapping configuration for Poco.Role to Data.Role
Destination property: Name
Missing type map configuration or unsupported mapping.
Exception of type 'AutoMapper.AutoMapperMappingException' was thrown.

at AutoMapper.MappingEngine.AutoMapper.IMappingEngineRunner.Map(ResolutionContext context)
at AutoMapper.MappingEngine.Map(Object source, Object destination, Type sourceType, Type destinationType)
at AutoMapper.MappingEngine.Map(TSource source, TDestination destination)
at AutoMapper.Mapper.Map(TSource source, TDestination destination)
at Repository.RoleRepository.FindAll(IRole filter) in RoleRepository.cs: line 31
at Repository.ReaderRepositoryBase`1.Find(TEntity filter) in ReaderRepositoryBase.cs: line 30
at Test.RepositoryTests.GetRoleInternal() in RepositoryTests.cs: line 79
--AutoMapperMappingException
at AutoMapper.Mappers.TypeMapObjectMapperRegistry.PropertyMapMappingStrategy.MapPropertyValue(ResolutionContext context, IMappingEngineRunner mapper, Object mappedObject, PropertyMap propertyMap)
at AutoMapper.Mappers.TypeMapObjectMapperRegistry.PropertyMapMappingStrategy.Map(ResolutionContext context, IMappingEngineRunner mapper)
at AutoMapper.Mappers.TypeMapMapper.Map(ResolutionContext context, IMappingEngineRunner mapper)
at AutoMapper.MappingEngine.AutoMapper.IMappingEngineRunner.Map(ResolutionContext context)
--AutoMapperMappingException
at AutoMapper.MappingEngine.AutoMapper.IMappingEngineRunner.Map(ResolutionContext context)
at AutoMapper.Mappers.TypeMapObjectMapperRegistry.PropertyMapMappingStrategy.MapPropertyValue(ResolutionContext context, IMappingEngineRunner mapper, Object mappedObject, PropertyMap propertyMap)
--AutoMapperMappingException
at AutoMapper.MappingEngine.AutoMapper.IMappingEngineRunner.Map(ResolutionContext context)