AutoMapper: Missing type map configuration or unsupported mapping in .Net Core

Dung Do Tien Dec 30 2020 236

I use AutoMapper for web API application of asp.net core currently. I am getting the following error:

Mapping types:
Object -> CustomerDto
System.Object -> CRMAPI.Application.EzCustomers.Customers.Queries.CustomerDto
   at lambda_method(Closure , Object , CustomerDto , ResolutionContext )
   at Shared.Extensions.MapperExtension.To[T](Object source) in D:\Project\Ez-buy\crm-api\Shared\Extensions\MapperExtension.cs:line 17
   at CRMAPI.Application.EzCustomers.Customers.Queries.GetListCustomerQueryHandler.<>c.<Handle>b__2_2(Customer c) in D:\Project\Ez-buy\crm-api\CRMAPI.Application\EzCustomers\Customers\Queries\GetListCustomerQueryHandler.cs:line 58
   at System.Linq.Enumerable.SelectListIterator`2.MoveNext()
   at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeList(JsonWriter writer, IEnumerable values, JsonArrayContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeValue(JsonWriter writer, Object value, JsonContract valueContract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerProperty)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject(JsonWriter writer, Object value, JsonObjectContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeValue(JsonWriter writer, Object value, JsonContract valueContract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerProperty)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject(JsonWriter writer, Object value, JsonObjectContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeValue(JsonWriter writer, Object value, JsonContract valueContract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerProperty)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.Serialize(JsonWriter jsonWriter, Object value, Type objectType)
   at Newtonsoft.Json.JsonSerializer.SerializeInternal(JsonWriter jsonWriter, Object value, Type objectType)
   at Newtonsoft.Json.JsonSerializer.Serialize(JsonWriter jsonWriter, Object value)
   at Microsoft.AspNetCore.Mvc.Formatters.NewtonsoftJsonOutputFormatter.WriteResponseBodyAsync(OutputFormatterWriteContext context, Encoding selectedEncoding)
   at Microsoft.AspNetCore.Mvc.Formatters.NewtonsoftJsonOutputFormatter.WriteResponseBodyAsync(OutputFormatterWriteContext context, Encoding selectedEncoding)
   at Microsoft.AspNetCore.Mvc.Formatters.NewtonsoftJsonOutputFormatter.WriteResponseBodyAsync(OutputFormatterWriteContext context, Encoding selectedEncoding)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextResultFilterAsync>g__Awaited|29_0[TFilter,TFilterAsync](ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResultExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.ResultNext[TFilter,TFilterAsync](State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeResultFilters()

And below is my code.

MapperExtension.cs

public static class MapperExtension
{
    private static IMapper _mapper;

    public static IMapper RegisterMap(this IMapper mapper)
    {
        _mapper = mapper;
        return mapper;
    }

    public static T To<T>(this object source)
    {
        return _mapper.Map<T>(source);
    }

    public static T To<T>(this object source, T dest)
    {
        return _mapper.Map(source, dest);
    }
}

GetCustomerDtoByAccountIdQueryHandler.cs 

public class GetCustomerDtoByAccountIdQuery : IRequest<CustomerDto>
{
    public GetCustomerDtoByAccountIdQuery(string accountId)
    {
        AccountId = accountId;
    }

    public string AccountId { get; private set; }
}

public class GetCustomerDtoByAccountIdQueryHandler : IRequestHandler<GetCustomerDtoByAccountIdQuery, CustomerDto>
{
    private readonly IRepository<Customer> _repository;

    public GetCustomerDtoByAccountIdQueryHandler(IRepository<Customer> repository)
    {
        _repository = repository;
    }

    public async Task<CustomerDto> Handle(GetCustomerDtoByAccountIdQuery request,
        CancellationToken cancellationToken)
    {
        var customer = await _repository.GetSingleAsync(x => x.AccountId.Equals(request.AccountId));
        var response = customer.To<CustomerDto>();
        return response;
    }
}

Please suggest to me how to solve this problem.

Have 1 answer(s) found.
  • Please try to check the Automapper configuration in your application, you can refer to my configuration as follows:

    DomainToDtoMappingProfile.cs:

    public class DomainToDtoMappingProfile : Profile
    {
        public DomainToDtoMappingProfile()
        {
            CreateMap<Order, OrderDto>();
        }
    }

    Startup.cs:

    var mapperConfig = new MapperConfiguration(cfg =>
    {
        cfg.AddProfile(new DomainToDtoMappingProfile());
    });
    services.AddSingleton(mapperConfig.CreateMapper().RegisterMap());

    Please refer to Auto Mapper configuration here

    Milan cubes Dec 30 2020
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