使用Automapper的多对多DTO [英] Many-to-many to DTOs using Automapper

问题描述

如果我在EF中定义了多对多关系：

  public class StudentImage 
 {
 public int StudentId {get;组; } 
 public int ImageId {get;组; } 
 public int Order {get;组; } 
 public virtual Student Student {get;组; } 
 public virtual Image Image {get;组; } 
} 
 
 public class Student 
 {
 public int Id {get;组; } 
 public string Name {get;组; } 
 public virtual ICollection< StudentImage>图片{get;组; } 
} 
 
 
 public class Image 
 {
 public int Id {get;组; } 
 public string Filename {get;组; } 
 public virtual ICollection< StudentImage>学生{get;组; } 
} 
  

而DTO的：

  public class ImageDTO 
 {
 public int Id {get;组; } 
 public string Filename {get;组; } 
 public int Order {get;组; } 
} 
 
 public class StudentIDO 
 {
 public int Id {get;组; } 
 public string Name {get;组; } 
 public ICollection< ImageDTO>图片{get;组; } 
} 
  

如何从学生到学生DTO和从Image到MapDTO使用Automapper映射？

解决方案

Mappings

  Mapper.CreateMap< Student，StudentIDO>（）; 
 
 Mapper.CreateMap< StudentImage，ImageDTO>（）
 .ForMember（d => d.Id，opt => opt.MapFrom（s => s.ImageId）） 
 .ForMember（d => d.Filename，opt => opt.MapFrom（s => s.Image.Filename））; 
 
 Mapper.CreateMap< StudentIDO，Student>（）
 .AfterMap（（s，d）=> 
 {
 foreach（var studentImage in d.Images ）
 studentImage.StudentId = s.Id; 
}）; 
 
 Mapper.CreateMap< ImageDTO，StudentImage>（）
 .ForMember（d => d.ImageId，opt => opt.MapFrom（s => s.Id）） ; 
  

使用

  var studentDTO = Mapper.Map< StudentIDO>（student）; 
 var student = Mapper.Map< Student>（studentDTO）; 
  

If I have a many-to-many relationship defined in EF:

public class StudentImage 
{
    public int StudentId { get; set; }
    public int ImageId { get; set; }
    public int Order { get; set; }
    public virtual Student Student { get; set; }
    public virtual Image Image { get; set; }
}

public class Student
{
    public int Id { get; set; }
    public string Name { get; set; }
    public virtual ICollection<StudentImage> Images { get; set; }
}


public class Image
{
    public int Id { get; set; }
    public string Filename { get; set; }
    public virtual ICollection<StudentImage> Students { get; set; }
}

And the DTO's:

 public class ImageDTO
    {
        public int Id { get; set; }
        public string Filename { get; set; }
        public int Order { get; set; }
    }

    public class StudentIDO
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public ICollection<ImageDTO> Images { get; set; }
    }

How could I map from Student to StudentDTO and from Image to ImageDTO using Automapper?

解决方案

Mappings

Mapper.CreateMap<Student, StudentIDO>();

Mapper.CreateMap<StudentImage, ImageDTO>()
        .ForMember(d => d.Id, opt => opt.MapFrom(s => s.ImageId))
        .ForMember(d => d.Filename, opt => opt.MapFrom(s => s.Image.Filename));

Mapper.CreateMap<StudentIDO, Student>()
      .AfterMap((s, d) =>
      {
          foreach (var studentImage in d.Images)
              studentImage.StudentId = s.Id;
      });

Mapper.CreateMap<ImageDTO, StudentImage>()
      .ForMember(d => d.ImageId, opt => opt.MapFrom(s => s.Id));

Usage

var studentDTO = Mapper.Map<StudentIDO>(student);
var student = Mapper.Map<Student>(studentDTO);

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