自动映射器：将类型X的属性从源对象映射到目标对象，并将等值属性映射为类型X

Question

不确定我用的是正确的措词，因此希望示例足够清楚。

我想做的事情对我来说似乎很基础，所以我假设我缺少明显的东西。

对于此示例，这两个ForMember映射很简单，可以完成工作。 问题是对于更复杂的类，给定配置了任何中间映射，您如何简单地将一个对象的属性映射到整个目标？

我现在搜索了一段时间，最接近找到答案的位置在这里，但是ConvertUsing语法对我不起作用（我使用的是Automapper 4.2.1）

以下是示例类：

public class UserRoleDto
{
    public string Name { get; set; }
    public string Description { get; set; }
}

public class DbRole
{
    public Guid RoleId { get; set; }
    public string Name { get; set; }
    public string Description { get; set; }
}

public class DbUserRole
{
    public Guid UserId { get; set; }
    public DbRole Role { get; set; }
}

这是我使用Automapper配置设置的测试用例（在LINQPad中进行测试，这就是最后一行最后的Dump（）的作用）

var dbRole = new DbRole { RoleId = Guid.NewGuid(), Name = "Role Name", Description = "Role Description" };
var dbUserRole = new DbUserRole { UserId = Guid.NewGuid(), Role = dbRole };

var config = new MapperConfiguration(cfg =>
    {
        cfg.CreateMap<DbRole, UserRoleDto>();

        /* Works but verbose for a class with more than a few props */
        cfg.CreateMap<DbUserRole, UserRoleDto>()
            .ForMember(dest => dest.Name, opt => opt.MapFrom(src => src.Role.Name))
            .ForMember(dest => dest.Description, opt => opt.MapFrom(src => src.Role.Description))
            ;
    });

config.AssertConfigurationIsValid();
var mapper = config.CreateMapper();
var userRoleDto = mapper.Map<UserRoleDto>(dbUserRole).Dump();

Answer 1

传入要映射的子对象怎么样？ 例如

cfg.CreateMap<DbRole, UserRoleDto>();

然后，不映射dbUserRole ，而是映射dbUserRole.Role 。

var userRoleDto = mapper.Map<UserRoleDto>(dbUserRole.Role);

这是另一个使用以下类的示例：

public class Person
{
    public int person_id;
    public int age;
    public string name;
}

public class Address
{
    public int address_id;
    public string line1;
    public string line2;
    public string city;
    public string state;
    public string country;
    public string zip;
}

public class PersonWithAddress
{
    public int person_id;
    public int age;
    public string name;
    public InnerAddress address;
}

public class InnerAddress
{
    public string city;
    public string state;
    public string country;
}

使用以下测试用例：

var person = new Person { person_id = 100, age = 30, name = "Fred Flintstone" };
var address = new Address { address_id = 500, line1 = "123 Main St", line2 = "Suite 3", city = "Bedrock", state = "XY", country = "GBR", zip="90210" };

var config = new MapperConfiguration(cfg =>
{
    cfg.CreateMap<Person, PersonWithAddress>();
    cfg.CreateMap<Address, InnerAddress>();
});

var mapper = config.CreateMapper();
var person_with_address = mapper.Map<Person, PersonWithAddress>(person);
person_with_address.address = new InnerAddress();
mapper.Map<Address, InnerAddress>(address, person_with_address.address);

问候，

罗斯