具有新的多语言映射的投影或自定义值解析器

Question

我正在使用最新版本的 ASP.Net Boilerplate（版本 3.7.2）。我目前正在使用新的多语言实体。

我在将 1 个实体自动映射到 Dto 时遇到问题，因为它不仅需要多语言方面，还需要 Projection/Custom 属性之一的解析器。

到目前为止，所有映射都正常工作。我遵循了 ASP.NET Boilerplate Documentation

中的文档

[Table("CategoryItems")]
public class CategoryItem : BaseClass, IMultiLingualEntity<CategoryItemTranslation>
{
    /// <summary>
    /// Gets or Sets the Category Item Display Order
    /// </summary>
    public int DisplayOrder { get; set; }

    /// <summary>
    /// Gets or Sets Catalog Categories
    /// </summary>
    public virtual ICollection<CatalogItem> CatalogItems { get; set; } = new HashSet<CatalogItem>();

    ...

    /// <summary>
    /// Gets or Sets all the Entity Translations
    /// </summary>
    public virtual ICollection<CategoryItemTranslation> Translations { get; set; } = new HashSet<CategoryItemTranslation>();
}


[Table("CategoryItemTranslations")]
public class CategoryItemTranslation : IEntityTranslation<CategoryItem>
{
    /// <summary>
    /// Get or Set Category Item Name
    /// </summary>
    public string CategoryItemName { get; set; }

    /// <summary>
    /// Gets or Sets Link to Category Item
    /// </summary>
    public CategoryItem Core { get; set; }

    /// <summary>
    /// Gets or Sets Link to Core Id
    /// </summary>
    public int CoreId { get; set; }

    /// <summary>
    /// Gets or Sets the Language
    /// </summary>
    public string Language { get; set; }
}


public class ReadCategoryItemFilterDto : PhantomEntityDto
{
    public string CategoryItemName { get; set; }

    ...

    public int ItemCount { get; set; }

    ...
}

在 ApplicationModule 的初始化中使用创建多语言地图代码 class:

cfg.CreateMultiLingualMap<CategoryItem, CategoryItemTranslation, ReadCategoryItemFilterDto>(new MultiLingualMapContext(IocManager.Resolve<ISettingManager>()));

翻译实体中的 CategoryItemName 正确映射到 ReadCategoryItemFilterDto 上的 CategoryItemName。

现在我需要将 CatalogItems 计数映射到 Dto 上的 ItemCount。

我尝试添加到映射配置器：

cfg.CreateMap<CategoryItem, ReadCategoryItemFilterDto>()
    .ForMember(dest => dest.ItemCount, opts => opts.MapFrom(src => src.CatalogItems.Count));

和

cfg.CreateMap<CategoryItem, ReadCategoryItemFilterDto>()
    .ForMember(dest => dest.ItemCount, opts => opts.ResolveUsing(new CatalogItemFilterCountResolver()));

使用

public class CatalogItemFilterCountResolver : IValueResolver<CategoryItem, ReadCategoryItemFilterDto, int>
{
    public int Resolve(CategoryItem source, ReadCategoryItemFilterDto destination, int m, ResolutionContext context)
    {
        return source.CatalogItems.Count;
    }
}

如果我在 CreateMultiLingualMap 之前添加此地图，则 CatalogItemName 映射正确但 ItemCount 失败。如果我将投影或解析器放在 CreateMultiLingualMap 之后，则 ItemCount 映射正确但 CatalogItemName 映射失败。

如何创建地图配置文件以允许映射这两个属性？

谢谢。

Answer 1

对于您的情况，您不需要使用扩展程序 CreateMultiLingualMap。您可以创建自己的包含多语言映射的映射定义。

原来是这样；

configuration.CreateMap<CategoryItem, ReadCategoryItemFilterDto>()
    .BeforeMap((source, destination, context) =>
    {
        var translation = source.Translations.FirstOrDefault(pt => pt.Language == CultureInfo.CurrentUICulture.Name);
        if (translation != null)
        {
            context.Mapper.Map(translation, destination);
            return;
        }


        var multiLingualMapContext = new MultiLingualMapContext(IocManager.Instance.Resolve<ISettingManager>());
        var defaultLanguage = multiLingualMapContext.SettingManager.GetSettingValue(LocalizationSettingNames.DefaultLanguage);

        translation = source.Translations.FirstOrDefault(pt => pt.Language == defaultLanguage);

        if (translation != null)
        {
            context.Mapper.Map(translation, destination);
            return;
        }

        translation = source.Translations.FirstOrDefault();
        if (translation != null)
        {
            context.Mapper.Map(translation, destination);
        }

    }).ForMember(dest => dest.ItemCount, opts => opts.MapFrom(src => src.CatalogItems.Count));

Answer 2

https://aspnetboilerplate.com/Pages/Documents/Multi-Lingual-Entities#createmultilingualmap

configuration.CreateMultiLingualMap<CategoryItem, CategoryItemTranslation, ReadCategoryItemFilterDto>(context)
.EntityMap.ForMember(dest => dest.ItemCount, opt => opt.MapFrom(src => src.CatalogItems.Count));

具有新的多语言映射的投影或自定义值解析器

Projection or Custom Value Resolvers with new Multi Lingual Mappings

automapper

asp.net-core

aspnetboilerplate