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c#asp.net-corelocalizationautomapperaspnetboilerplate

Data localization in mapping in ASP.NET Zero


I'd like to know if there is a way to use localization based on data in the mapping of DTOs, something like:

public class EntityX : FullAuditedEntity, IMustHaveTenant
{
    public virtual int TenantId { get; set; }
    public virtual ICollection<EntityXTranslation> Translations { get; set; }
}

public class EntityXTranslation
{
    public virtual int EntityXId { get; set; }
    public int LanguageId { get; set; }
    public string Name { get; set; }
}

public class EntityXDto : FullAuditedEntityDto
{
    public string Name { get; set; }
}
configuration.CreateMap<EntityX, EntityXDto>()
    .ForMember(dto => dto.Name, options =>
    {
        var languageId = 1; //TODO: get current language
        options.MapFrom(uom => uom.Translations.FirstOrDefault(t => t.LanguageId == languageId).Name);
    });

Solution

  • Okay, after a couple of hours investigation I got a nice way to do it:

    configuration.CreateMap<UnitOfMeasure, UnitOfMeasureListItem>()
                .ForMember(dto => dto.Name, options =>
                           MapFromTranslated<EntityX, 
                                             EntityXTranslation, 
                                             EntityXDto, 
                                             string>(options, t => t.Name));
    
    void MapFromTranslated<TSource, TTranslation, TDestination, TMember>
                    (IMemberConfigurationExpression<TSource, TDestination, TMember> options, 
                     Expression<Func<TTranslation, TMember>> member)
        where TSource : IHaveTranslations<TTranslation>
        where TTranslation : TranslationEntity
    {
        options.MapFrom(uom => MapTranslation(uom, member));
        options.MapAtRuntime();
    }
    
    TMember MapTranslation<TSource, TTranslation, TMember>
                    (TSource entity, Expression<Func<TTranslation, TMember>> member)
        where TSource : IHaveTranslations<TTranslation>
        where TTranslation : TranslationEntity
    {
        var languageName = CultureInfo.CurrentUICulture.Name.Split('-').FirstOrDefault();
        var translation = entity.Translations.FirstOrDefault(t => t.Language.Name.Contains(languageName)) ?? entity.Translations.FirstOrDefault(t => t.LanguageId == 1);
        var translationParameter = Expression.Parameter(typeof(TTranslation), "t");
        var targetProperty = Expression.Property(translationParameter, ((MemberExpression)member.Body).Member.Name);
        var action = Expression.Lambda<Func<TTranslation, TMember>>(targetProperty, translationParameter);
        return action.Compile().Invoke(translation);
    }