如何使用 Automapper 将一个源映射到多个目的地？

Question

示例如下：实体：

public class Contact 
{ 
   public int Id { get; set; }

   ......

   public ICollection<ContactDetail> ContactDetails { get; set; }
}

public class ContactDetail 
{  
   public Guid Id { get; set; }

   public int ContactId { get; set; }

   public ContactDetailTypes ContactDetailType { get; private set; }
   
   public string Email { get; set; }

   public string Address { get; set; }

   public string Phone { get; set; }

   ......
}

public enum ContactDetailTypes : byte
    {
        Email = 1,
        Phone = 2,
        Address = 3,
        ......

    }

视图模型：

public class ContactViewModel
{  
   public int Id { get; set; }

   ......
   
   public ICollection<ContactEmailViewModel> ContactEmails { get; set; }
   public ICollection<ContactPhoneViewModel> ContactPhones { get; set; }
   public ICollection<ContactAddressViewModel> ContactAddresses { get; set; }
}


public class ContactEmailViewModel
{  
   public Guid Id { get; set; }

   public int ContactId { get; set; }
   
   public string Email { get; set; }
}

public class ContactPhoneViewModel
{  
   public Guid Id { get; set; }

   public int ContactId { get; set; }
   
   public string Phone { get; set; }
}

public class ContactAddressViewModel
{  
   public Guid Id { get; set; }

   public int ContactId { get; set; }
   
   public string Address { get; set; }
}

我想将 ContactDetail 映射到 ContactEmailViewModel、ContactPhoneViewModel、ContactAddressViewModel：

         CreateMap<ContactDetail, ContactEmailViewModel>()
                .ForMember(dest => dest.Id, opts => 
                {
                    opts.PreCondition(s => s.ContactDetailType == ContactDetailTypes.Email);
                    opts.MapFrom(src => src.Id); 
                })
                .ForMember(dest => dest.ContactId, opts => 
                {
                    opts.PreCondition(s => s.ContactDetailType == ContactDetailTypes.Email);
                    opts.MapFrom(src => src.ContactId);
                })
                .ForMember(dest => dest.Email, opts => 
                {
                    opts.PreCondition(s => s.ContactDetailType == ContactDetailTypes.Email);
                    opts.MapFrom(src => src.Email); 
                });

(Phone, Address map are similar to above)

当我使用上述配置文件将 Contact 映射到 ContactViewModel 时，ContactEmails、ContactPhones、ContactAddresses 的计数始终为 0。我认为 automapper 可以检查 detailType 并将源映射到不同的目的地，但失败了。

如果我使用这三个视图模型的所有属性创建一个 ContactDetailViewModel，它会将所有属性从 ContactDetail 映射到 ContactDetailViewModel。

本例中如何使用Automapper实现一个源到多个目标的映射？

更新：我添加了一张新地图仍然没有运气：

CreateMap<ICollection<ContactDetail>, ContactViewModel>()  
.ForMember(dest => dest.ContactEmails, opts => opts.MapFrom(src => src.Where(s => s.ContactDetailType == ContactDetailTypes.Email)))
.ForMember(dest => dest.ContactPhones, opts => opts.MapFrom(src => src.Where(s => s.ContactDetailType == ContactDetailTypes.Phone)))
.ForMember(dest => dest.ContactAddresses, opts => opts.MapFrom(src => src.Where(s => s.ContactDetailType == ContactDetailTypes.Address)));

我的post为什么会投入...我问是因为我试了好几次都找不到答案...

Answer 1

最终实现如下：

 CreateMap<Contact, ContactViewModel>()
                .ForMember(dest => dest.Id, opts => opts.MapFrom(src => src.Id))
                ...
                .ForMember(dest => dest.ContactEmails, opts => opts.MapFrom(src => src.ContactDetails.Where(s => s.ContactDetailType == ContactDetailTypes.Email)))
                .ForMember(dest => dest.ContactPhones, opts => opts.MapFrom(src => src.ContactDetails.Where(s => s.ContactDetailType == ContactDetailTypes.Phone)))
                .ForMember(dest => dest.ContactAddresses, opts => opts.MapFrom(src => src.ContactDetails.Where(s => s.ContactDetailType == ContactDetailTypes.Address)));

如何使用 Automapper 将一个源映射到多个目的地？

How to map one source to multiple destinations using Automapper?

c#

automapper