Asp.net core 使用AutoMapper展平多对多关系

我使用的是EF Core，两个表之间存在多对多关系

 public class Sale
    {
        public int Id { get; set; }
        public DateTime Date { get; set; }
        public double Total { get; set; }
        public List<SalePaymentMethod> SalePaymentMethods { get; set; }
    }

关系的另一个表：

public class PaymentMethod
{
    public int Id { get; set; }
    public string PaymentName { get; set; }
    public bool PaymentType { get; set; }
    public List<SalePaymentMethod> SalePaymentMethods { get; set; }

}

---

我的问题可能是我想在主映射中做另一个映射。

我找到了解决方法

创建一个配置文件，以将

SalePaymentMethod

从映射到

PaymentMethodDto

    public class PaymentMethodProfile : Profile
{
    public PaymentMethodProfile()
    {
        CreateMap<SalePaymentMethod, PaymentMethodDto>()
             .ForMember(q => q.Amount, opt => opt.MapFrom(s => s.Amount))
             .ForMember(q => q.DefferedPaymentCount, opt => opt.MapFrom(s => s.DefferedPaymentCount))
             .ForMember(q => q.PaymentName, opt => opt.MapFrom(s => s.PaymentMethod.PaymentName))
             .ForMember(q => q.PaymentType, opt => opt.MapFrom(s => s.PaymentMethod.PaymentType));


    }
}

}

然后像这样使用它：

 _mapper.ProjectTo<SaleUserBranchProductsDTO>(_context.Sales.Where(wh => wh.UserId == UserId)).ToList();

\u mapper.ProjectTo（_context.Sales.Where（wh=>wh.UserId==UserId））.ToList（）；

是的，这是可能的。“你试过什么了吗？”我浪费了一整天的时间来想办法解决它。发布这个问题几分钟后，我设法解决了它。谢谢：）

public class PaymentMethodDto
{
    public string PaymentName { get; set; }
    public bool PaymentType { get; set; }
    public int DefferedPaymentCount { get; set; }
    public double Amount { get; set; }
}

    public class PaymentMethodProfile : Profile
{
    public PaymentMethodProfile()
    {
        CreateMap<SalePaymentMethod, PaymentMethodDto>()
             .ForMember(q => q.Amount, opt => opt.MapFrom(s => s.Amount))
             .ForMember(q => q.DefferedPaymentCount, opt => opt.MapFrom(s => s.DefferedPaymentCount))
             .ForMember(q => q.PaymentName, opt => opt.MapFrom(s => s.PaymentMethod.PaymentName))
             .ForMember(q => q.PaymentType, opt => opt.MapFrom(s => s.PaymentMethod.PaymentType));


    }
}

public SaleUserBranchProductsProfile()
{
    CreateMap<Sale, SaleUserBranchProductsDTO>()
        .ForMember(q => q.Id, opt => opt.MapFrom(s => s.Id))
        .ForMember(q => q.Date, opt => opt.MapFrom(s => s.Date))
        .ForMember(q => q.Total, opt => opt.MapFrom(s => s.Total))
        //Here is the magic
        .ForMember(q=> q.PaymentMethoddtos, opt => opt.MapFrom(s => s.SalePaymentMethods));
}

 _mapper.ProjectTo<SaleUserBranchProductsDTO>(_context.Sales.Where(wh => wh.UserId == UserId)).ToList();