AutoMapper.AutoMapperMappingException: Missing type map configuration or unsupported mapping in .NET CORE

Question

I am using the AutoMapper in .NET CORE application. I configured the AutoMapper in my Startup.cs in ConfigureServices.cs method file which is as follows :

public void ConfigureServices(IServiceCollection services)
        {

             /* Some Code */
            
            /* AutoMapper Configuration */
            services.AddAutoMapper(typeof(AutoMapperProfileConfiguration).GetType().Assembly);

            services.AddMvcCore();

             /* Some Code */
        }

and the AutoMapperProfileConfiguration is as follows :

public class AutoMapperProfileConfiguration : Profile
    {
        public AutoMapperProfileConfiguration()
        {
            CreateMap<LoginRequestDto, Users>();
        }
    }

Then I used this mapper in the following class :

public LoginResponseDto CreateAnAccount(LoginRequestDto loginRequestDto)
        {
            var userInfo = _mapper.Map<Users>(loginRequestDto);
            userInfo.Id = Guid.NewGuid();
            _context.InsertItem<Users>(userInfo);
            var insertedUserDetails = _context.GetItemById<Users>(userInfo.Id);
            insertedUserDetails.Wait();
            return _mapper.Map<LoginResponseDto>(insertedUserDetails.Result);
        }

But it gives me the following exception when I try to map the data present in loginRequestDto to Users class :

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

Mapping types:
Object -> Users
System.Object -> NeighborhoodHelpers.UserMicroservice.Entities.Models.Users
   at lambda_method(Closure , Object , Users , ResolutionContext )
   at NeighborhoodHelpers.UserMicroservice.DataAccessProvider.UserDataAccess.UserDataAccess.CreateAnAccount(LoginRequestDto loginRequestDto) in D:\Gursimran\Hackathon2\NeighborhoodHelpers.UserMicroservice.API\NeighborhoodHelpers.UserMicroservice.DataAccessProvider\UserDataAccess\UserDataAccess.cs:line 29
   at NeighborhoodHelpers.UserMicroservice.Services.UserServices.UserService.CreateAnAccount(LoginRequestDto loginRequestDto) in D:\Gursimran\Hackathon2\NeighborhoodHelpers.UserMicroservice.API\NeighborhoodHelpers.UserMicroservice.Services\UserServices\UserService.cs:line 22
   at NeighborhoodHelpers.UserMicroservice.API.Controllers.LoginController.CreateAnAccount(LoginRequestDto loginRequestDto) in D:\Gursimran\Hackathon2\NeighborhoodHelpers.UserMicroservice.API\NeighborhoodHelpers.UserMicroservice.API\Controllers\LoginController.cs:line 34
   at lambda_method(Closure , Object , Object[] )
   at Microsoft.Extensions.Internal.ObjectMethodExecutor.Execute(Object target, Object[] parameters)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.SyncObjectResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeActionMethodAsync()
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeNextActionFilterAsync()
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync()
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextResourceFilter>g__Awaited|24_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResourceExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeFilterPipelineAsync()
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
   at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
   at Swashbuckle.AspNetCore.SwaggerUI.SwaggerUIMiddleware.Invoke(HttpContext httpContext)
   at Swashbuckle.AspNetCore.Swagger.SwaggerMiddleware.Invoke(HttpContext httpContext, ISwaggerProvider swaggerProvider)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

I am using .NET Core 3.1. Please help me with this. I am unable to use the AutoMapper Functionality.

My answer has been updated

Useme Alehosaini
– Useme Alehosaini

2020-12-28 12:27:53 +00:00
Commented Dec 28, 2020 at 12:27 — Useme Alehosaini
– Useme Alehosaini, Commented Dec 28, 2020 at 12:27

Useme Alehosaini · Accepted Answer · 2020-12-28 12:27:32Z

4

In your code, looks like the AutoMapper's configuration is not seeing the defined profile, in order to correct it, I recommend using one of the two options below.

Option 1: NuGet Package AutoMapper

For Flexibility and Cleaner Code, define an extension method to add the current AutoMapperProfileConfiguration and many others as needed in the future.
Call it in Startup.cs

CustomAutoMapper.cs :

using AutoMapper;
using Microsoft.Extensions.DependencyInjection;

namespace MyApp.CustomConfiguration
{
    public static class CustomAutoMapper
    {
        public static void AddCustomConfiguredAutoMapper(this IServiceCollection services)
        {
            var config = new MapperConfiguration(cfg =>
            {
                cfg.AddProfile(new AutoMapperProfileConfiguration());
            });

            var mapper = config.CreateMapper();

            services.AddSingleton(mapper);
        }
    }
}

In Startup.cs:

services.AddCustomConfiguredAutoMapper();

Option 2: Use AutoMapper.Extensions.Microsoft.DependencyInjection Nuget Package (I personally prefer to use it for more than two years as I use multiple assemblies in my Solution and this package gives automatic discovery for Profiles as it automatically scans the solution for any class inherit from AutoMapper's Profile class.

Simply in your Startup.cs :

services.AddAutoMapper(AppDomain.CurrentDomain.GetAssemblies());

edited Dec 28, 2020 at 12:27

answered Dec 27, 2020 at 15:51

Useme Alehosaini

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4 Comments

Useme Alehosaini Over a year ago

@Simran Kaur How many assemblies you have in your solution? What is the name of the package of AutoMapper and the version you have installed?

Simran Kaur Over a year ago

I have installed Automapper version 10.1.1

Useme Alehosaini Over a year ago

How many projects in your solution? and where is the Profile class is located (in which assembly?) @Simran Kaur

setlio Over a year ago

services.AddAutoMapper(AppDomain.CurrentDomain.GetAssemblies()); solved my issue! Thanks a lot.

Rena · Accepted Answer · 2020-12-28 02:21:09Z

3

Change your Startup.cs like below:

services.AddAutoMapper(typeof(AutoMapperProfileConfiguration));

answered Dec 28, 2020 at 2:21

Rena

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Comments

berkansasmaz · Accepted Answer · 2020-12-29 15:17:35Z

-1

Seeing the properties of Users and LoginRequestDto can make it easier to answer your question. Because as can be understood from the error message, there are properties that need to be "ignore" or you are doing things like converting the dictionary to a list.

If you can show your classes, maybe we can arrange the following line accordingly and solve the problem.

CreateMap<LoginRequestDto, Users>();

answered Dec 29, 2020 at 15:17

berkansasmaz

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