Question

我有类似以下多对多关系表。

public class Shop{
 public int Id { get; set; }
 public virtual ICollection<ShopFacility> ShopFacilities { get; set; }
}

public class ShopFacility
{
 public int Id { get; set; }        
 public int ShopId { get; set; }
 public int FacilityId { get; set; }
 public virtual Shop Shop { get; set; }
 public virtual Facility Facility { get; set; }
}

public class Facility
{
 public int Id { get; set; }        
 public virtual ICollection<ShopFacility> ShopFacilities { get; set; }
}

并获取商店信息。

using (var context = new DataContext())
{
 return context.Shops.Include(s => s.ShopFacilities)
                     .Include("ShopFacilities.Facility")  // This line
                     .First(x => x.Id == id);
}

我想要做的是使用Lambda表达式调用Include方法以获得多对多关系而不是字符串。我试图像下面的代码那样实现：

using (var context = new DataContext())
{
 return context.Shops.Include(s => s.ShopFacilities)
                     .Include(s => s.ShopFacilities.Facility)  // Cannot compile
                     .First(x => x.Id == id);
}

但是你猜我无法编译它。实际上，第一个代码片段运行良好，所以基本上没关系，但是，我有点好奇是否有工作。

任何帮助将不胜感激，

柳

Answer 1

试试这个：

return context.Shops.Include(s => s.ShopFacilities.Select(f => f.Facility))
              .First(x => x.Id == id);

但你应该遵循@Kristof在评论中提出的建议。

EF Code First CTP5，使用包含多对多表的方法

1 个答案: