AutoMapper

Question

我正在尝试使用 AutoMapper 将一个实体与另一个实体相关联，而另一个实体与第三个实体相关以查看模型

如何将这三个实体映射为一个？

来源：

public class Address
{
    public int AddressId { get; set; }
    public string AddressLine1 { get; set; }       
    public int CityId { get; set; }
    public virtual City City { get; set; }  
}

public class City
{
    public int CityId { get; set; }
    public string CityName { get; set; }
    public int CountryId { get; set; }
    public virtual Country Country { get; set; }

    public virtual ICollection<Address> Addresses { get; set; }
}
public class Country
{
    public int CountryId { get; set; }
    public string CountryName { get; set; }
    public virtual ICollection<City> Cities { get; set; }
}

目的地：

Public Class AddressViewModel
{
    public int AddressId { get; set; }
    public string AddressLine1 { get; set; }       
    public int CityId { get; set; }
    public string CityName { get; set; }
    public int CountryId { get; set; }
    public string CountryName { get; set}
}

Answer 1

有几种方式（至少）。如果您以不同的方式命名您的视图模型字段，它可能会按照约定发生：

Public Class AddressViewModel
{
    public int AddressId { get; set; }
    public string AddressLine1 { get; set; }       
    public int CityCityId { get; set; }
    [DisplayName("City Name")]
    public string CityCityName { get; set; }
    public int CityCountryCountryId { get; set; }
    [DisplayName("Country Name")]
    public string CityCountryCountryName { get; set}
}

如果觉得太丑，可以在CreateMap中做：

Mapper.CreateMap<Address, AddressViewModel>()
    .ForMember(dest => dest.CityId, opts => opts.MapFrom(src => src.City.CityId))
    .ForMember(dest => dest.CityName, opts => opts.MapFrom(src => src.City.CityName))
    .ForMember(dest => dest.CountryId, opts => opts.MapFrom(src => src.City.Country.CountryId))
    .ForMember(dest => dest.CountryName, opts => opts.MapFrom(src => src.City.Country.CountryName));

http://automapper.codeplex.com/wikipage?title=Flattening&referringTitle=Home

Answer 2

使用 Include() 查询更深层次数据的示例：

    public AddressViewModel GetAddressById(int id)
    {
        var result = applicationDbContext.Address
            .Include(o=>o.City)
            .Include(o=>o.City.Country)
            .FirstOrDefault(x=>x.AddressId == id);
        return mapper.Map<AddressViewModel>(result);
    }

AutoMapper - 如何映射到三层深度

AutoMapper - How to Map to three level deep

c#

asp.net-mvc

entity-framework-6