自动将一个源映射到多个目标 [英] Automapper one source to multiple destination

问题描述

下面是我的课程

class Dest1    
{    
 string prop1;
 string prop2;
 strig prop3;
 public Dest2 Dest2 {get;set;}
 pubic List<Dest3> Dest3 {get;set;}
}

class Dest2    
{   
 string prop4;
 string prop5;
 strig prop6;   
}

class Dest3        
{    
 string prop7;    
}

class Source1

{
 string prop1;
 string prop2;
 string prop3;
 string prop4;
 }
     class Source2
      {
 string prop7;
       }

我需要地图

Q1.从source1类到Dest1类(我也需要映射dest2对象)

Q1. source1 class to Dest1 Class( also i need to map dest2 object)

Q2.我需要将Dest1映射回源1(反向映射)

Q2. I need to do map Dest1 back to Source 1 (reverse map)

Am使用.net核心和自动映射器.对于automapper& .net核心..提前感谢

Am using .net core and auto mapper.. am new to automapper & .net core ..Thanks in advance

推荐答案

如果您配置了映射，则AutoMapper可以从多个源映射到任意多个目的地.例如，您请求的方案:

AutoMapper can map from as many sources to as many destinations as you would like, assuming you configure the mapping. For example, your requested scenario:

var configuration = new MapperConfiguration(cfg =>
    // Mapping Config
    cfg.CreateMap<Source1, Dest2>()
        .ForMember(dest => dest.prop5, opt => opt.Ignore())
        .ForMember(dest => dest.prop6, opt => opt.Ignore());
    cfg.CreateMap<Source1, Dest1>()
        .ForMember(dest => dest.Dest2, opt => opt.MapFrom(src => src));

    // Reverse Mapping Config
    cfg.CreateMap<Dest1, Source1>()
        .ForMember(dest => dest.prop4,
                   opt => opt.MapFrom(src => (src?.Dest2 != null) // ?. w/c#6 
                                             ? src.Dest2.prop4 // map if can
                                             : null)); // otherwise null
);
// Check AutoMapper configuration
configuration.AssertConfigurationIsValid();

具有相同名称的属性将自动映射.任何没有相应来源属性的目标属性都将被忽略.

Properties with the same name will map automatically. Any destination properties that don’t have a corresponding source property will need to be ignored.

一旦配置了AutoMapper，就可以使用IMapper界面根据需要进行映射.

Once your AutoMapper is configured, you can map as needed with the use of the IMapper interface.

public class Foo {
    private IMapper _mapper;
    public Foo(IMapper mapper) {
        _mapper = mapper;
    }

    // Map Source1 -> Dest1
    public Dest1 Bar(Source1 source) {
        return _mapper.Map<Dest1>(source);
    }

    // Map Dest1 -> Source1
    public Source1 Baz(Dest1 dest) {
        return _mapper.Map<Source1>(dest);
    }
}

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