Automapper chain / nested object mapping throw exception

Question

I am using AutoMapper version 10.1.1 in .NET CORE 5 project. I have nested object that I need map but unable to do so and getting following exception although I can get data mapped for first child which in my case 'Enforcements' but cannot access to child of child Object 'Contraventions'

Class at Level 0

 public class SiteContraventionDataView
{
    public int SiteId { get; set; }

    public string SiteName { get; set; }

    public ICollection<EnforcementDataView> Enforcements { get; set; }

}

Child Class at level 1

public class EnforcementDataView
{
    public int EnforcementId { get; set; }

    public ICollection<ContraventionDataView> Contraventions { get; set; }
}

I am getting error when I try to set source for 'Contraventions' from above child class. I am trying to lambda expression to get Contravention object reference

 .ForMember(dataView => dataView.Enforcements.Select(x=>x.Contraventions), opt => opt.MapFrom(dataModel => GetContraventions(dataModel.Enforcements.ToList())))

AutoMapping class

public class SiteContraventionsProfile : Profile
{
    public SiteContraventionsProfile()
    {
        CreateMap<Site, SiteContraventionDataView>()
            .ForMember(dataView => dataView.SiteId, opt => opt.MapFrom(dataModel => dataModel.SiteId))
            .ForMember(dataView => dataView.SiteName, opt => opt.MapFrom(dataModel => dataModel.SiteName))
            .ForMember(dataView => dataView.Enforcements, opt => opt.MapFrom(dataModel => dataModel.Enforcements))
            .ForMember(dataView => dataView.Enforcements.Select(x=>x.Contraventions), opt => opt.MapFrom(dataModel => GetContraventions(dataModel.Enforcements.ToList())))
            ;

       
    }

    private List<Contravention> GetContraventions(List<Enforcement> enforcements)
    {
        List<Contravention> contraventions = new List<Contravention>();

        if (enforcements.Any())
        {
            var t1 = enforcements.Select(x => x.EnforcementContraventions);
        }
        
        return contraventions;
    }
}

Martin Staufcik · Accepted Answer · 2021-09-09 10:33:44Z

1

Try to add mappings for Enforcement and Contravention:

CreateMap<Enforcement, EnforcementDataView>();
CreateMap<Contravention, ContraventionDataView>();
CreateMap<Site, SiteContraventionDataView>();

answered Sep 9, 2021 at 10:33

Martin Staufcik

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