使用Linq

Question

我有以下嵌套类。我试图在DisplayOrder字段

的适当位置进行排序

public class Menu
    {
        public virtual string MenuDescription { get; set; }
        public virtual bool Active { get; set; }
        public virtual short SiteId { get; set; }
        public virtual IEnumerable<MenuHeader> MenuHeaders { get; set; }
    }

    public class MenuHeader 
    {
        public virtual string HeaderName { get; set; }
        public virtual string Url { get; set; }
        public virtual string DisplayOrder { get; set; }
        public virtual IEnumerable<MenuCategory> MenuCategories { get; set; }
    }

   public class MenuCategory
    {
        public virtual string Name { get; set; }
        public virtual string Icon { get; set; }
        public virtual string Url { get; set; }
        public virtual string DisplayOrder { get; set; }
        public virtual IEnumerable<MenuOptionHeader> MenuOptionHeaders { get; set; }
    }

 public class MenuOptionHeader
    {
        public virtual string Name { get; set; }
        public virtual string Url { get; set; }
        public virtual string DisplayOrder { get; set; }
        public virtual IEnumerable<MenuOption> MenuOptions { get; set; }
    }

 public class MenuOption 
    {
        public virtual string Name { get; set; }
        public virtual string Url { get; set; }
        public virtual string DisplayOrder { get; set; }
    }

我很难通过DisplayOrder

返回每个级别排序的所有数据

我正在尝试像

这样的东西

menuRepository.GetAll(x => x.SiteId == _siteConfiguration.Id && x.Active == true)
              .SelectMany(x => x.MenuHeaders.OrderBy(d => d.DisplayOrder))
              .SelectMany(x1 => x1.MenuCategories.OrderBy(o => o.DisplayOrder))
              .SelectMany(x2 => x2.MenuOptionHeaders.OrderBy(o => o.DisplayOrder));

这仅返回零件数据集。如何修改linq以返回DisplayOrder在每个级别排序的所有数据

Answer 1

您在收集项目上调用OrderBy这一事实并未在不重新分配结果的情况下对其进行排序。在您的示例中，您需要额外的变量来存储订购的商品。您的商品是否与商店断开连接？如果是这样，你可以这样做：

List<Menu> orderedItems = menuRepository
    .GetAll(x => x.SiteId == _siteConfiguration.Id && x.Active == true)
    .ToList()
    .ForEach(m => 
    {
        m.MenuHeaders = m.MenuHeaders.OrderBy(d => d.DisplayOrder);
        m.MenuCategories = m.MenuCategories.OrderBy(d => d.DisplayOrder);
        m.MenuOptionHeaders = m.MenuOptionHeaders.OrderBy(d => d.DisplayOrder);
    });

确实会将IOrderedEnumerable分配给嵌套属性。