时间戳

首页 > 解决方案 > 具有多对多和 IncludeMembers 的 Automapper

c# - 具有多对多和 IncludeMembers 的 Automapper

问题描述

下面是我的课

  public class Account
    {
       public int Id { get; set; }
       
       public string AccountNumber { get; set; } = null!;      
       ..other fields
       
       public  SubAccount1 SubAccount1 { get; set; } = null!;
       public  SubAccount2 SubAccount2 { get; set; } = null!;
      public ICollection<AccountCustomer> AccountAndCustomers { get; set; } = new List<AccountCustomer>();   ///Many to many mapping
    }
    
   public class AccountCustomer  
   {
        public int AccountId { get; set; }
        public Account Account { get; set; } = null!;

        public int CustomerId { get; set; }
        public Customer Customer { get; set; } = null!;
        ...other fields
   }
    
 public class SubAccount1
    {
       public int AccountId { get; set; }
       public  Account Account { get; set; } = null!;
       public string  Subfield1 { get; set; } = null!;
        ..other fields
    }
    
    public class SubAccount2
    {
       public int AccountId { get; set; }
       public  Account Account { get; set; } = null!;
       public string  Subfield2 { get; set; } = null!;
        ..other fields
    }
    
 
    public class SubAccount1DTO
    {
    
       public int AccountId { get; set; }   
       
       public string AccountNumber { get; set; } = null!;
  
       public string  Subfield1 { get; set; } = null!;
       
       public IReadOnlyList<CustomerDTO> Customers { get; set; } = new List<CustomerDTO>();
    }
public class CustomerDTO
    {

        public int Id { get; set; }
        public string CustomerNo { get; set; } = null!;

        public string FirstName { get; set; } = null!;
         ..other fillds

       }

public class Customer 
    {
      

       public int Id { get; set; }  
       public string? CustomerNo { get; set; } = null!;
       ....other filds
       public ICollection<AccountCustomer> AccountAndCustomers { get; set; } = new List<AccountCustomer>();

}

基于此链接的自动映射器配置 Automapper 多对多

CreateMap<Customer, CustomerDTO>().ReverseMap();

CreateMap<Account, SubAccount1DTO>()                          
                .IncludeMembers(s => s.SubAccount1)
                .ForMember(d => d.Customers, opt => opt.MapFrom(s => s.AccountAndCustomers))   ///After include Customers related am getting error
                 .ReverseMap()
                  .AfterMap((s, d) =>
                  {
                      foreach (var accountCustomer in d.AccountAndCustomers)
                          accountCustomer.AccountId = s.AccountId ;
                  });
                             
    CreateMap<SubAccount1, SubAccount1DTO>(MemberList.None)
                  .ForMember(dest => dest.Id, opt => opt.Ignore())
                  .ForMember(dest => dest.AccountNumber, opt => opt.Ignore())
                  .ReverseMap();

 CreateMap<Customer, AccountCustomer>()  ----i dnt no whether this to included
            .ForMember(dest => dest.CustomerId, opt => opt.MapFrom(src => src.Id))
            .ForMember(dest => dest.Customer, opt => opt.MapFrom(src => src))
            .ForMember(dest => dest.AccountId, opt => opt.Ignore())
            .ForMember(dest => dest.Account, opt => opt.Ignore())
            ;

我需要将 Account 映射到 SubAccount1DTO 和 Reversemap。这里 SubAccount1DTO 有 customersdto 的列表但是当我包含在下面的行时

.ForMember(d => d.Customers, opt => opt.MapFrom(s => s.AccountAndCustomers))

我得到以下错误..请建议

发生一个或多个错误。（Application.DTOs.Accounts.SubAccount1DTO 上的以下成员无法映射：客户添加自定义映射表达式、忽略、添加自定义解析器或修改目标类型 Application.DTOs.Accounts.SubAccount1DTO。上下文：映射到来自的成员客户Domain.Entities.Accounts.Account 到 Application.DTOs.Accounts.SubAccount1DTO

标签： c#automapperfluent

解决方案

以下映射

.ForMember(d => d.Customers, opt => opt.MapFrom(s => s.AccountAndCustomers))

将类型的源属性映射到类型ICollection<AccountCustomer>的目标属性IReadOnlyList<CustomerDTO>。

AutoMapper 允许这样做，但需要您为集合元素类型创建映射 - 在这种特定情况下，AccountCustomerto CustomerDTO（在链接的帖子中有类似的映射 from BookCategoryto CategoryDto）。

因此，您在这里需要的最低要求是在映射器配置中添加类似这样的内容：

CreateMap<AccountCustomer, CustomerDTO>()
    .IncludeMembers(s => s.Customer);

推荐阅读