c# - 无法使用 Automapper 将第二个实体添加到 ViewModel？

Question

我仍在学习 MVC，最近有人建议我考虑使用 AutoMapper 来映射我的 ViewModel。因此，我开始了测试，但我不了解如何映射两个实体，也找不到示例。

我有一个 Person 表和一个 Address 表。我想将两者组合成一个 ViewModel 以传递给我的 View。查看示例，它们总是显示如何映射一个实体而不是两个实体。

在下面的代码中，我可以看到我的 currentPerson 和 currentAddress 对象都使用调试器填充了数据，但是我的 currentMember ViewModel 只有 Person 数据。这是有道理的，因为我只在 Person 上使用 Mapper.Map，但我如何告诉 currentMember 也映射地址？

public ActionResult Edit(int id = 0)
        {
            using (DataContext db = new DataContext())
            {
                Person currentPerson = db.Person.Find(id);
                Address currentAddress = db.Address.Single(a => a.PID == id);

                AutoMapper.Mapper.CreateMap<Person, AdminViewModel>();
                AutoMapper.Mapper.CreateMap<Address, AdminViewModel>();

                MemberViewModel currentMember = AutoMapper.Mapper.Map<AdminViewModel>(currentPerson);

                return View(currentMember);
            }
        }

Answer 1

AutoMapper.Map 有一个带有源对象和目标对象的重载。所以你可以使用这样的东西来利用它:

创建 View 模型

public class PersonViewModel
{
    //your person fields here..
    //create them with the same name as Person 
    //to avoid having to set each field during mapping  
}

public class AddressViewModel
{
    //your address fields here..
}

public class AdminViewModel
{
    public PersonViewModel Person {get; set;}   

    public AddressViewModel Address {get; set;} 
}

Crete 映射(您应该将所有映射集中在一个类中):

public class EntityToViewModelProfile : Profile
{
    protected override void Configure()
    {
        //Create mappings for Person and Address
        AutoMapper.Mapper.CreateMap<Person, AdminViewModel>();
        AutoMapper.Mapper.CreateMap<Address, AdminViewModel>();


        //Create a map to AdminViewModel for both Person and Address

        Mapper.CreateMap<Models.Person, Models.AdminViewModel>()
            .ForMember(dest => dest.Person, opt => opt.MapFrom(src => src));

        Mapper.CreateMap<Models.Address, Models.AdminViewModel>()
            .ForMember(dest => dest.Address, opt => opt.MapFrom(src => src));
    }
}

在 Global.asax.cs 中注册 EntityToViewModelProfile

AutoMapper.Mapper.Initialize(x =>
{
    x.AddProfile<EntityToViewModelProfile>();
});

然后，在您的 Controller 中使用 .Map 的重载

using (DataContext db = new DataContext())
{
    Person currentPerson = db.Person.Find(id);
    Address currentAddress = db.Address.Single(a => a.PID == id);

    var mapPerson = AutoMapper.Mapper.Map<Person, AdminViewModel>(currentPerson);

    var mapPersonAndAddress = AutoMapper.Mapper.Map<Address, AdminViewModel>(currentAddress, mapPerson);

    return View(mapPersonAndAddress);
}