C# - 在 DTO 中添加列表

Question

我有 2 个 DTO

汽车详情Dto

public class CarDetailDto : IDto
{
    public int Id { get; set; }
    public string Description { get; set; }
    public string ColorName { get; set; }
    public string BrandName { get; set; }
    public string CompanyName { get; set; }
    public int ModelYear { get; set; }
    public double DailyPrice { get; set; }
}

CompanyWithCarDetailDto

public class CompanyWithCarDetailDto:IDto
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string Email { get; set; }
    public List<CarDetailDto> Cars { get; set; }
}

以及我的使用上下文=>

using (RentACarContext context = new RentACarContext())
{

    var result = from company in context.Companies
                 join car in context.Cars
                 on company.Id equals car.CompanyId
                 join brand in context.Brands
                 on car.BrandId equals brand.Id
                 join color in context.Colors
                 on car.ColorId equals color.Id
                 where company.Id == id
                 select new CompanyWithCarDetailDto
                 {
                     Id = company.Id,
                     Name = company.Name,
                     Email = company.Email,
                     Cars = ?????????

                 };
}

如何在 DTO 中添加列表？

我想列出拥有汽车的公司

Answer 1

什么是 RentACarContext？它是数据库上下文吗，即数据库上下文？如果是这样，那么我建议它将从数据库检索数据并将数据转换为 dto 的逻辑分开。您可能需要查看实体框架中的一对多指南。

如果您遵循 EF 指南，您将获得每个公司的汽车列表。然后从数据库检索后转换它们 - 就像：

result.select(company=> new CompanyWithCarDetailDto
                 {
                     Id = company.Id,
                     Name = company.Name,
                     Email = company.Email,
                     Cars = company.Cars.Select(car=> new CarDetailDto
                                  {
                                      Id= car.Id,
                                      Description = car.Description 
                                      .....
                                  }

                 };