如何将 Mapper.Map 与 ConstructUsing 和 AutoMapper 结合使用？

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

Answer 1

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.