How to configure Automapper to ignore Object-Properties if properties is null but map if not null

Question

I am using Automapper. In that, I mapped the DTO objects with another object.

UserProperties Class.

public string DisplayName { get; set; }

public int Id { get; set; }

public int NotesCount {get;set;}

PersonsDTO class

public string UserName { get; set; }

public int UserId { get; set; }

public int NotesCount { get ; set; }

public int BooksCount { get; set; }

Persons class

public UserProperties? UserDetails { get; set; }

public int NotesCount { get ; set; }

public int BooksCount { get; set; }

In Mapping Profile,

CreateMap<PersonsDTO, Persons>()
             .ForPath(o => o.UserDetails.DisplayName, b => b.MapFrom(z => z.UserName))
             .ForPath(o => o.UserDetails.Id, b => b.MapFrom(z => z.UserId))
             .ReverseMap();

In my case, UserDetails in the Persons class is a nullable type. If UserId in the PeronsDTO class is 0 means, I no need to map UserDetails. It should returns as null for the UserDetails property.

How can I achieve it?

Automapper Version: 9.0.0

are you looking for this: https://stackoverflow.com/questions/54677087 - or this: https://stackoverflow.com/questions/32621702 - or this: https://stackoverflow.com/questions/43947475 — Rand Random, Aug 07 '20 at 14:03

Dillon Drobena · Accepted Answer · 2020-08-07T13:55:18.307

1

You can specify a custom resolver to explicitly do your custom mapping.

    CreateMap<PersonDTO, Person>()
      .ForMember(dest => dest.UserDetails, opt => opt.MapFrom<CustomResolver>());

    public class CustomResolver : IValueResolver<PersonDTO, Person, UserProperties>
    {
        public UserProperties Resolve(PersonDTO source, Person destination, UserProperties member, ResolutionContext context)
        {
            if (source.UserId == 0)
                return null;
            return new UserProperties
            {
                DisplayName = source.UserName,
                Id = source.UserId
            };
        }
    }

edited Aug 07 '20 at 13:55

answered Aug 06 '20 at 23:51

Dillon Drobena

761
1
8
26

Yes tried by adding the condition like this...But it does not working. – Nivitha Gopalakrishnan Aug 07 '20 at 03:47
Can you tell me the behavior you're seeing from both my suggestions if they don't work? The conditional statements should prevent the mapping from taking place if the condition isn't met – Dillon Drobena Aug 07 '20 at 13:24
The above conditional statements should prevent the mapping for the inner properties only like UserDetails.DisplayName. I need to prevent tha mapping for the UserDetails class itself. – Nivitha Gopalakrishnan Aug 07 '20 at 13:40
I changed the answer to use a custom resolver instead. – Dillon Drobena Aug 07 '20 at 13:56

How to configure Automapper to ignore Object-Properties if properties is null but map if not null

1 Answers1