如何使用Automapper映射集合

Question

我有以下课程

 public class StateDto
    {
        public int Id { get; set; }
        public string StateName { get; set; }
        public string StateCode { get; set; }

    }
 public class CountryDto
    {

        public int Id { get; set; }
        public string CountryName { get; set; }
        public string CountryCode { get; set; }
        public List<StateDto> States { get; set; }
    }



public class Country : Entity, IValidatableObject
    {
        public Country()
        {
            States=new List<State>();
        }
        public string CountryName { get; set; }
        public string CountryCode { get; set; }
 // Few code related to IvalidatableObject removed
        public virtual ICollection<State> States { get; private set; }

        public void AddNewStatesInCountry(State state)
        {

            state.CountryId = Id;
            States.Add(state);

        }

       public bool IsDuplicateStateCodeExisits(string stateCode)
        {
            return States.Any(s => s.StateCode == stateCode);
        }

    }

public class State : Entity, IValidatableObject
    {
        public string StateName { get; set; }
        public string StateCode { get; set; }
        public int CountryId { get; set; }

      // Few code related to IvalidatableObject removed
    }

我正在使用以下代码映射这两个类

 Mapper.CreateMap<State, StateDto>();
    Mapper.CreateMap<Country, CountryDto>();  // Mapping Country to CountryDto

但是我在执行代码时遇到此错误

AutoMapper.AutoMapperMappingException : Missing type map configuration or unsupported mapping.

Mapping types:
Country -> CountryDto
Domain.ErpBase.CountryAgg.Country -> Application.ErpBase.Dto.CountryDto

Destination path:
CountryDto

Source value:
Domain.ErpBase.CountryAgg.Country

我的映射有什么问题，如何解决此问题。 类中的映射集合是否需要任何特殊的设置

NB：我尝试了countryMap.ForMember（cm => cm.States，mc => mc.MapFrom（co => co.States））;

Answer 1

我认为您仅定义了从Country到CountryDto的映射。 您可能也需要相反的东西

Answer 2

Automapper处理集合，因此您的映射定义很好。

你应该，但是，提供一个公共的setter为States的Country 。