c# - LINQ to Entities 无法识别方法组连接

Question

如何解决这个错误？为什么会上涨？

Additional information: LINQ to Entities does not recognize the method 'System.Collections.Generic.List1[FRecipes.Models.Component]
ToList[Component](System.Collections.Generic.IEnumerable1

public ActionResult ShowDishes(int id)
    {
        DishesWithCategory dish = new DishesWithCategory();
        dish.category = id;
        List<Item> Test = new List<Item>();
        var result1 = (
        from d in FRE.Dish
        join c in FRE.Component on d.DishID equals c.DishID into items
        select new Item { DishID = d.DishID, components = items.ToList() }
        ).ToList();

        return View();
    }

模型:

public class DishesWithCategory
{
    public List<Item> item { get; set; }
    public int category { get; set; }
}

public class Item
{
    public int DishID { get; set; }

    public string DishName { get; set; }

    public List<Component> components { get; set; }
}

public partial class Component
{
    public int ComponentID { get; set; }
    public int DishID { get; set; }
    public string AmountID { get; set; }
    public string NameID { get; set; }
}

Answer 1

尝试替换这一行:

select new Item { DishID = d.DishID, components = items.ToList() }

用这个:

select new Item { DishID = d.DishID, components = items }

错误很明显:ToList() 函数无法在该上下文中翻译。