C# 实体框架基于多个子集合的过滤器选择对象

假设我有以下域（不是我的实际域，而是一个简单的示例）

这样做会给我带来错误

无法将lambda表达式转换为类型“string”，因为它不是委托类型 （显然对颜色不满意，这里需要一种方法

所以我把它改成这个作为实验

var efClasses = (from d in myentity.ClassRoom
                  where ( (d.Desks.Where(x=>x.Colour == "blue"))
                         || (d.LunchBoxs.Where(x=>x.Colour == "green)) )
select d).Distinct();

但这也不会编译（事后看来，我有一种感觉，在这件事上我在碰碰运气

---

我可以反过来，将我的from改为myentity.Desks和myentity.午餐盒，并返回两个单独的教室列表，然后找到工会，但这需要两个单独的DB点击，并且感觉像这样使用Count>0

 var efClasses = (from d in myentity.ClassRoom
                             where (d.Desks.Count(x => x.Colour == "blue") > 0
                                    || d.LunchBoxs.Count(x => x.Colour == "green") > 0)
                             select d);

---

像这样使用Count>0

 var efClasses = (from d in myentity.ClassRoom
                             where (d.Desks.Count(x => x.Colour == "blue") > 0
                                    || d.LunchBoxs.Count(x => x.Colour == "green") > 0)
                             select d);

---

像这样使用Count>0

 var efClasses = (from d in myentity.ClassRoom
                             where (d.Desks.Count(x => x.Colour == "blue") > 0
                                    || d.LunchBoxs.Count(x => x.Colour == "green") > 0)
                             select d);

---

像这样使用Count>0

 var efClasses = (from d in myentity.ClassRoom
                             where (d.Desks.Count(x => x.Colour == "blue") > 0
                                    || d.LunchBoxs.Count(x => x.Colour == "green") > 0)
                             select d);

---

您可以使用任何

var efClasses = (from d in myentity.ClassRoom
                 where (d.Desks.Any(x => x.Colour == "blue") ||
                        d.LunchBoxs.Any(x => x.Colour == "green"))
                 select d);

---

您可以使用任何

var efClasses = (from d in myentity.ClassRoom
                 where (d.Desks.Any(x => x.Colour == "blue") ||
                        d.LunchBoxs.Any(x => x.Colour == "green"))
                 select d);

---

您可以使用任何

var efClasses = (from d in myentity.ClassRoom
                 where (d.Desks.Any(x => x.Colour == "blue") ||
                        d.LunchBoxs.Any(x => x.Colour == "green"))
                 select d);

---

您可以使用任何

var efClasses = (from d in myentity.ClassRoom
                 where (d.Desks.Any(x => x.Colour == "blue") ||
                        d.LunchBoxs.Any(x => x.Colour == "green"))
                 select d);