汽车应用程序 - 将属性映射到收集

Question

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; }
}

因此，我想将presentAddress（一个对象）和先前的附加绘制（集合）映射到地址属性（集合），其中每个元素具有ISPresentAddress属性，如果绘制了PresentAddress，则该元素应该为真，并且对于以前的AdadDress映射了forse。我尝试编写这样的地图基本规则：

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

当然，它无法正常工作。如何处理？

Answer 1

这可以使用ForMember扩展方法来完成。

这是获取想要的东西的快速而肮脏的方法。它制作了一个新的ApplicationDriverAddressFormVM列表要映射，但是如果您探索文档，则可以找到更优雅的东西。

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

---

进一步调查后，我发现了以下方法。它使用ResolveUsing选项。同样，这很粗糙，只使用我发现的第一个功能。您应该进一步探索IMemberConfigurationExpression接口，并查看您拥有的其他选项

        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;
    }