Automapper

Question

来源类:

public class ApplicationDriverFormVM
{
    public ApplicationDriverAddressFormVM PresentAddress { get; set; }
    public List<ApplicationDriverAddressFormVM> PreviousAddresses { get; set; }
}

public class ApplicationDriverAddressFormVM
{
    [Required]
    [StringLength(256)]
    [Display(Name = "Address")]
    public string Address { get; set; }
    [Required]
    [StringLength(256)]
    [Display(Name = "City")]
    public string City { get; set; }
    //.....
}

目的地类：

public class ApplicationDriverDomain
{
    public List<ApplicationDriverAddressDomain> Addresses { get; set; }
}

public class ApplicationDriverAddressDomain
{
    public int Id { get; set; }
    public string Address { get; set; }
    public string City { get; set; }
    //....
    public bool IsPresentAddress { get; set; }
}

所以，我想将 PresentAddress（一个对象）和 PreviousAddresses（集合）映射到 Addresses 属性（集合），其中每个元素都有 IsPresentAddress 属性，这应该是真的，如果它PreviousAddresses 映射元素被映射为 PresentAddress 和 false。我试着写这样的地图基本规则：

        CreateMap<ViewModels.ApplicationDriverFormVM, ApplicationDriverDomain>();
        CreateMap<ViewModels.ApplicationDriverAddressFormVM, ApplicationDriverAddressDomain>();

当然，它不能正常工作。怎么做到的？

Answer 1

这可以通过 ForMember 扩展方法来完成。

这是一种快速而肮脏的方式来获得你想要的东西。它创建了一个新的 ApplicationDriverAddressFormVM 组合列表来映射，但如果您浏览文档，您可能会找到更优雅的内容。

Mapper.CreateMap<ApplicationDriverFormVM, ApplicationDriverDomain>()
    .ForMember(dest => dest.Addresses, opt => opt.MapFrom(src => src.PreviousAddresses.Union(new List<ApplicationDriverAddressFormVM>() { src.PresentAddress })));

Mapper.CreateMap<ApplicationDriverAddressFormVM, ApplicationDriverAddressDomain>();

经过进一步调查，我发现了以下方法。它使用 ResolveUsing 选项。同样，这很粗糙，只使用了我发现的第一个功能。您应该进一步探索 IMemberConfigurationExpression 界面，看看还有哪些其他选项

        Mapper.CreateMap<ApplicationDriverFormVM, ApplicationDriverDomain>()
            .ForMember(dest => dest.Addresses, opt => opt.ResolveUsing(GetAddresses));

...

    static object GetAddresses(ApplicationDriverFormVM src)
    {
        var result = Mapper.Map<List<ApplicationDriverAddressDomain>>(src.PreviousAddresses);
        foreach(var item in result)
        {
            item.IsPresentAddress = false;
        }
        var present = Mapper.Map<ApplicationDriverAddressDomain>(src.PresentAddress);
        present.IsPresentAddress = true;
        result.Add(present);

        return result;
    }

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