AutoMapper中相同实体类型的不同映射规则

Question

我有两个实体:Order&OrderDTO我正在使用AutoMapper将它们映射在一起.

基于某些条件,我希望这些实体的映射方式不同.

实际上,我想为这些实体提供两个或更多不同的映射规则(CreateMap).

并且在调用Map函数时我想告诉引擎使用哪个映射规则.

感谢这个问题:使用CreateMap的实例版本和使用WCF服务映射？一种方法是使用不同的mapper实例,因此每个实例都可以拥有自己的映射规则:

var configuration = new ConfigurationStore(new TypeMapFactory(), MapperRegistry.AllMappers());
var mapper = new MappingEngine(configuration);
configuration.CreateMap<Dto.Ticket, Entities.Ticket>()

你有更好的解决方案吗？

正如Jimmy Bogard(AutoMapper的创建者)所说:在Automapper中使用Profiles来映射具有不同逻辑的相同类型:

您最好创建单独的Configuration对象,并为每个对象创建单独的MappingEngine.Mapper类只是每个上面的静态外观,带有一些生命周期管理.

需要完成哪些生命周期管理？

Answer 1

我最终创建了一个新的映射器实例并将它们缓存在共享（静态）并发字典中。

这是我的代码（vb.net）：

映射器工厂：

Public Function CreateMapper() As IMapper Implements IMapperFactory.CreateMapper
            Dim nestedConfig = New ConfigurationStore(New TypeMapFactory, MapperRegistry.Mappers)
            Dim nestedMapper = New MappingEngine(nestedConfig)
            Return New AutomapperMapper(nestedConfig, nestedMapper)
 End Function

不同的场景有不同的配置文件：

Private Shared _mapperInstances As New Concurrent.ConcurrentDictionary(Of String, IMapper)

Public Shared ReadOnly Property Profile(profileName As String) As IMapper
            Get
                Return _mapperInstances.GetOrAdd(profileName, Function() _mapperFactory.CreateMapper)
            End Get
End Property

和映射器类：

Friend Class AutomapperMapper
        Implements IMapper

        Private _configuration As ConfigurationStore
        Private _mapper As MappingEngine

        Public Sub New()
            _configuration = AutoMapper.Mapper.Configuration
            _mapper = AutoMapper.Mapper.Engine
        End Sub

        Public Sub New(configuration As ConfigurationStore, mapper As MappingEngine)
            _configuration = configuration
            _mapper = mapper
        End Sub

        Public Sub CreateMap(Of TSource, TDestination)() Implements IMapper.CreateMap
            _configuration.CreateMap(Of TSource, TDestination)()
        End Sub

        Public Function Map(Of TSource, TDestination)(source As TSource, destination As TDestination) As TDestination Implements IMapper.Map
            Return _mapper.Map(Of TSource, TDestination)(source, destination)
        End Function

        Public Function Map(Of TSource, TDestination)(source As TSource) As TDestination Implements IMapper.Map
            Return _mapper.Map(Of TSource, TDestination)(source)
        End Function


    End Class