How to use Mapper.Map with ConstructUsing and AutoMapper?

Question

I have a simple question: How to use Mapper.Map inside ConstructUsing? I'm using AutoMapper v4.1.1 and I have this piece of code that I want to cleanup by reusing the code.

Mapper.CreateMap<SKU, SKUViewModel>()
    .ConstructUsing(m => new SKUViewModel(
    (from texts in m.DescriptionTranslation.TranslationTexts
        select new TranslationTuple
        {
            LanguageId = texts.LanguageId,
            LanguageDisplayName = texts.Language.DisplayName,
            TranslationText = texts.Text,
            NeutralText = texts.NeutralText,
            ThreeLetterIsoLanguageName = texts.Language.ThreeLetterISOLanguageName
        }).ToList(),
        (from texts in m.DisplayNameTranslation.TranslationTexts
        select new TranslationTuple
        {
             LanguageId = texts.LanguageId,
             LanguageDisplayName = texts.Language.DisplayName,
             TranslationText = texts.Text,
             NeutralText = texts.NeutralText,
             ThreeLetterIsoLanguageName = texts.Language.ThreeLetterISOLanguageName
        }).ToList(),
        (from texts in m.PaypalDescriptionTranslation.TranslationTexts
        select new TranslationTuple
        {
             LanguageId = texts.LanguageId,
             LanguageDisplayName = texts.Language.DisplayName,
             TranslationText = texts.Text,
             NeutralText = texts.NeutralText,
             ThreeLetterIsoLanguageName = texts.Language.ThreeLetterISOLanguageName
        }).ToList()));

I know we can use Mapper.Map with the AfterMap method like this .AfterMap((s, d) => Mapper.Map(s.CompanyProfile, d));

But I'm not able to do the same inside ConstructUsing.

Any suggestion ?

David

atiyar · Accepted Answer · 2020-10-19 13:38:28Z

12

Since you have mappings defined for these entities, you could call Mapper.Map on it. For sample:

Mapper.CreateMap<SKU, SKUViewModel>()
    .ConstructUsing(m => 
    {
        var descriptions = Mapper.Map<List<TranslationTuple>>(m.DescriptionTranslation.TranslationTexts);
        var displays = Mapper.Map<List<TranslationTuple>>(m.DisplayNameTranslation.TranslationTexts);
        var paypals = Mapper.Map<List<TranslationTuple>>(m.PaypalDescriptionTranslation.TranslationTexts);
        
        return new SKUViewModel(descriptions, displays, paypals);
    });

Then, when you need to create an object mapped by automapper, just use:

var viewModel = Mapper.Map<List<SKUViewModel>>(sku);

Methods like ConstructUsing, AfterMap, BeforeMap are methods that is executed after you have everything defined. So, following this logic, it should execute Mapper.Map<> without problems.

edited Oct 19, 2020 at 13:38

atiyar

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answered Jan 15, 2016 at 19:59

Felipe Oriani

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5 Comments

Andrey Burykin Over a year ago

From version 4.2 of Automapper it's deprecated to use static method Mapper.Map(). So you should use ConstructUsing() with ResolutionContext and call ResolutionContext.Engine.Map().

Jack Over a year ago

@AndreyBurykin do you have an example implementation?

Andrey Burykin Over a year ago

@Jack Here is a good article with examples: lostechies.com/jimmybogard/2016/01/21/…

vladimir Over a year ago

example: CreateMap<S, D>().ConstructUsing( context => { var entity = (S)context.SourceValue; return new D { Id = entity.Id, c = context.Engine.Mapper.Map<C>entity.c) }; });

Dipon Roy Over a year ago

i had to go things like .ConstructUsing((s, c) => c.Mapper.Map<Order, OrderViewModel>(s.Order))

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