AutoMapper.Mapper does not contain definition for CreateMap

Question

This might be a basic question but wondering I am not getting AutoMapper.Mapper.CreateMap method.

Am I using wrong AutoMapper reference/package? Thanks

Mahler

Answer 1

The static version of the CreateMap method was deprecated in 4.2, then removed from the API in version 5.0. Jimmy Bogard talks about this in more detail in this blog post.

The new technique for mapping is non-static, like this (code is from the post):

var config = new MapperConfiguration(cfg => {
    cfg.CreateMap<Source, Dest>();
});

IMapper mapper = config.CreateMapper();
var source = new Source();
var dest = mapper.Map<Source, Dest>(source);

Hildahildagard

Thanks Will, wondering if you can advise how to use .ForMember() method, as couldn't find exact answer for my needs. – Mahler

Thank I found the way as below: might be helpful for others var configStack = new MapperConfiguration( cfg => { cfg.CreateMap<StackInfoVM, StackNameVM>().ForMember(dest => dest.stackId, opts => opts.MapFrom(src => src.itemId)) ; } ); – Mahler

I've same issue, i have tried as you suggested but gives me an error The type or namespace name 'MapperConfiguration' could not be found (are you missing a using directive or an assembly reference?) and also same for IMapper Can you please help me. – Zenobia

Could I add all mapping config in one config for all of my model? – Anchusin

@MasterProgrammer Yup! I most commonly see the configuration created as a static property with all the mappings created inside of it. – Hildahildagard

CreateMap<DomainObject, Dto>(); – Segmentation

Answer 2

Here is how I used AutoMapper in my code.

Step 1 : Downloaded AutoMapper through nuget-packages.

Version is

<package id="AutoMapper" version="6.1.1" targetFramework="net452" />

Step 1 : Created DTO class

public class NotificationDTO
{

    public DateTime DateTime { get; private set; }
    public NotificationType Type { get; private set; }
    public DateTime? OriginalDateTime { get; private set; }
    public string OriginalVenue { get; private set; }
    public ConcertDTO Concert { get; set; }
}

public class ConcertDTO
{
    public int Id { get; set; }
    public bool IsCancelled { get; private set; }
    public DateTime DateTime { get; set; }
    public string Venue { get; set; }

}

Step 2 : Created an AutoMapperProfile class which inherits from Profile

using AutoMapper;
using ConcertHub.DTOs;

namespace ConcertHub.Models
{
  public class AutoMapperProfile : Profile
  {
    public AutoMapperProfile()
    {
        CreateMap<Concert, ConcertDTO>();
        CreateMap<Notification, NotificationDTO>();
    }
  }
}

Step 3 : Registered AutoMapperProfile in the Application Start method of Global.asax file

protected void Application_Start()
    {
        AutoMapper.Mapper.Initialize(cfg => cfg.AddProfile<AutoMapperProfile>());

    }

Finally the magic piece of code in the Api Controller

public IEnumerable<NotificationDTO> GetNewNotification()
    {
        var userId = User.Identity.GetUserId();
        var notifications = _dbContext.UserNotifications
                .Where(un => un.UserId == userId && !un.IsRead)
                .Select(un => un.Notification)
                .Include(n => n.Concert)
                .ProjectTo<NotificationDTO>()//use Automapper.QueryableExtension namespace
                .ToList();

        return notifications;
    }

Hope it helps .

Opportune

Easier to understand. Thanks. – Terat

This looks like Mosh's tutorial from Pluralsight :-) – Assist

@Assist you are right dear :-). Glad it helped others. – Opportune

Well explained. Thanks.Better to explain in a good Practice way instead of just dumping the lines of code. – Warrior

Just wondering if this is working for Auto Mapper Version after Version 5.0?. The issue I am facing is, its working for version 4.1.1. But the moment I change it to a version higher than 4.0, its saying Mapper dont have CreateMap. – Battik

There's no Mapper.Initialize method anymore. – Lorrin

Answer 3

Here is how it works now:

        Mapper.Initialize(cfg =>
        {
            cfg.CreateMap<SupervisorEmployee, SupervisorViewModel>()
            .ForMember
                (dst => dst.Name, src => src.MapFrom<string>(e => SupervisorViewModel.MapName(e)))
            .ForMember
                (dst => dst.OfficePhone, src => src.MapFrom<string>(e => e.OfficePhone.FormatPhone(e.OfficePhoneIsForeign)))
            .ForMember
                (dst => dst.HomePhone, src => src.MapFrom<string>(e => e.HomePhone.FormatPhone(e.HomePhoneIsForeign)))
            .ForMember
                (dst => dst.MobilePhone, src => src.MapFrom<string>(e => e.MobilePhone.FormatPhone(e.MobilePhoneIsForeign)));
        });

Einberger

Answer 4

I see your class didn't inherit from AutoMapper.Profile

I did this and worked for me

public class AutoMapperConfig: AutoMapper.Profile

Delindadelineate

Why is this not the to answer? – Fancie

no idea... guess not that many people make this mistake – Delindadelineate