简单的例子Automapper [英] Simple Automapper Example

问题描述

我有一个很难理解如何特定对象映射。请回答这个简单的例子一些问题。

I am having a hard time to understand how to map certain objects. Please answer some questions about this simple example.

的示例代码的

class User
{
    private int id;
    private string name;
}

class Group
{
    private int id;
    private string name;
    private List<User> users;
}

[DataContract]
public class UserDto
{
    [DataMember]
    public int id { get; set; }
    [DataMember]
    public string name{ get; set; }      
}

[DataContract]
public class GroupDto
{
    [DataMember]
    public int id { get; set; }
    [DataMember]
    public string name{ get; set; }
    [DataMember]
    public List<User> Users { get; set; }      
}

的的映射器的

Mapper.CreateMap<User, UserDto>();
Mapper.CreateMap<UserDto, User>();

Mapper.CreateMap<Group, GroupDto>();
Mapper.CreateMap<GroupDto, Group>();

在映射组到 GroupDto ，你有地图用户到 UserDto 内部因为列表<使用者> 在组包括映射的用户？如果是的话，你怎么办呢？我的猜测是

When mapping Group to GroupDto, do you have to map User to UserDto internally because the List<User> in Group consist of unmapped Users? If so how do you do this? My guess is

Mapper.CreateMap<Group, GroupDto>()
    .ForMember(g => g.id, opt => opt.Ignore());
    .ForMember(g => g.name, opt => opt.Ignore());
    .ForMember(g => g.Users, opt => opt.MapFrom(u => Mapper.Map<Group, UserDto>(u)))

这是正确的？

推荐答案

1更改GroupDto是这样的：

1- Change the GroupDto to be like this:

[DataContract]
public class GroupDto
{
    [DataMember]
    public int id { get; set; }
    [DataMember]
    public string name{ get; set; }
    [DataMember]
    public List<UserDTO> Users { get; set; }      
}

2 - 创建映射：

2- Create your mappings :

Mapper.CreateMap<User, UserDto>();
Mapper.CreateMap<UserDto, User>(); // Only if you convert back from dto to entity

Mapper.CreateMap<Group, GroupDto>();
Mapper.CreateMap<GroupDto, Group>(); // Only if you convert back from dto to entity

3这一切，因为自动映射器会自动映射列表<使用者> 到列表< UserDto> （因为它们具有相同的名称，并且已经有一个映射从用户到UserDto）

3- that's all, because auto mapper will automatically map the List<User> to List<UserDto> (since they have same name, and there is already a mapping from user to UserDto)

4-当你想映射你拨打：

4- When you want to map you call :

Mapper.Map<GroupDto>(groupEntity);

希望有所帮助。

Hope that helps.

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