Automapper complex types mapping exception

问题:

I'm trying to implement the AutoMapper for a new module.

I have the MVC model at the web site, I'm working on, and it looks like this:

public class MvcModel {     public Params Params { get; set; }     public Steps Steps { get; set; } }     public class Params {     public int? RequestId { get; set; }      public bool NewClient { get; set; } }     public class Steps {     public Step1 Step1 { get; set; }         public Step2 Step2 { get; set; }         public Step3 Step3 { get; set; }     }     public class Step1 {     public int Name { get; set; }    }     public class Step2 {     public int Phone { get; set; }   }     public class Step3 {     public int Email { get; set; }   } 

For the other hand I have next class, that I have to pass to some service:

public class Request {     public Parameters Parameters { get; set; }     public RequestContent RequestContent { get; set; } }  public class Parameters {     public int NewClient { get; set; } }  public class RequestContent {     public int Id { get; set; }      public int InnerId { get; set; }     public string Session { get; set; }     public string Clerk { get; set; }     public bool Private { get; set; }      public PersonalDetails PersonalDetails { get; set; }         public Phones Phones { get; set; }       public ElectonicCommunication ElectonicCommunication { get; set; }   }  public class PersonalDetails {     public int Name { get; set; }    }  public class Phones {     public int Phone { get; set; }   }  public class ElectonicCommunication {     public int Email { get; set; }   } 

I've created a new AutoMapper configuration class (that is called from Global.asax):

public class AutoMapperConfig {     public static void Configure()     {         MapperConfiguration MapperConfiguration = new MapperConfiguration(cfg => {             cfg.AddProfile<Out>();             cfg.AddProfile<In>();             cfg.CreateMap<MvcModel, Request>();         });         MapperConfiguration.AssertConfigurationIsValid();     } }  public class Out: Profile {     protected override void Configure()     {         CreateMap<MvcModel, Request>()             .ForMember(dest => dest.Parameters, opt => opt.MapFrom(src => src.Params))             .ForMember(dest => dest.RequestContent, opt => opt.MapFrom(src => src.Steps));     } }  public class In: Profile {     protected override void Configure()     {         CreateMap<Request, MvcModel>()             .ForMember(dest => dest.Params, opt => opt.MapFrom(src => src.Parameters))             .ForMember(dest => dest.Steps, opt => opt.MapFrom(src => src.RequestContent));     } } 

Those are schematically similar, though the real object are a bit bigger and have different names.

Excpectations: MvcModel to be mapped to Request and backwards.

To be more accurate:

1. MvcModel.Params to be mapped to Request.Parameters and backwards
2. MvcModel.Steps to be mapped to Request.RequestContent and backwards
3. InnerId, Session, Clerk, Private from Request.RequestContent must be ignored

The problem: I'm getting an error, when on application start:

The following property on ... cannot be mapped:
Add a custom mapping expression, ignore, add a custom resolver, or modify the destination type ... Context: Mapping to property ... from ... to ... Mapping from type ... to ... from source type AutoMapperMessageBugTests.SourceChild Mapping to type Exception of type 'AutoMapper.AutoMapperConfigurationException' was thrown.

I didn't find good documentation on how to use AutoMapper globally for the application, and just can't figure how to use it properly and what exactly I'm doing wrong.

I couldn't find a good example of complex objects mapping ether...

Can someone help me with this?

回答1:

Thank's to stuartd this are working now!

The thing that I didn't understand was, that I have to map bottom to top! All the sub-objects have to mapped first, so they would be recognized at the moment parent objects are mapped!

Now profile's looks like this:

public class Out: Profile {    protected override void Configure()     {         CreateMap<Step1, PersonalDetails>();         CreateMap<Step2, Phones>();         CreateMap<Step3, ElectonicCommunication>();          CreateMap<Params, Parameters>();         CreateMap<Params, RequestContent>()             .ForMember(dest => dest.Id, opt => opt.MapFrom(src => src.RequestId))             .ForAllMembers(opt => opt.Ignore());         CreateMap<Steps, RequestContent>()             .ForMember(dest => dest.PersonalDetails, opt => opt.MapFrom(src => src.Step1))             .ForMember(dest => dest.Phones, opt => opt.MapFrom(src => src.Step2))             .ForMember(dest => dest.ElectonicCommunication, opt => opt.MapFrom(src => src.Step3))             .ForAllMembers(opt => opt.Ignore());          CreateMap<MvcModel, Request>()             .ForMember(dest => dest.Parameters, opt => opt.MapFrom(src => src.Params))             .ForMember(dest => dest.RequestContent, opt => opt.MapFrom(src => src.Steps));     } } 

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