LINQ到实体错误在ToList有一个一对多的属性

Question

每当我试着运行下面的代码

 employees = from e in this.entities.employees select e; 
     var ett = (from e in employees where 
         (e.salaries.ToList().Where(i => i.to_date.Year == 9999).First().salary1 > TT) 
        select e); 

     var etf = (from e in employees 
        where 
         (e.salaries.ToList().Where(i => i.to_date.Year == 9999).First().salary1 < TT && 
         e.salaries.ToList().Where(i => i.to_date.Year == 9999).First().salary1 > TF) 
        select e); 

     foreach (employee e in ett) 
     { 
      this.members.memberships.AddObject(new membership 
      { 
       FirstName = e.first_name, 
       LastName = e.last_name, 
       MembershipClass = "regular", 
       VerificationCode = "abc1234" 
      }); 
     } 

     foreach (employee e in etf) 
     { 
      this.members.memberships.AddObject(new membership 
      { 
       FirstName = e.first_name, 
       LastName = e.last_name, 
       MembershipClass = "regular", 
       VerificationCode = "abc1234" 
      }); 
     } 

我收到以下错误：

LINQ to Entities does not recognize the method 'System.Collections.Generic.List`1[app.salary] ToList[salary](System.Collections.Generic.IEnumerable`1[app.salary])' method, and this method cannot be translated into a store expression. 

Employee类并保持与工资一对多的关系。据我所知，这些错误引用了.ToList（）方法调用，但删除它们并没有解决问题。

编辑：增加了更多的代码，希望有助于。

Answer 1

我觉得这部分内容是：e.salaries.ToList()是问题所在。你不应该做.ToList()做LINQ查询，尽量不.ToList()

var ett = (from e in employees where 
         (e.salaries.Where(i => i.to_date.Year == 9999).First().salary1 > TT) 
        select e); 

    var etf = (from e in employees 
       where 
        (e.salaries.Where(i => i.to_date.Year == 9999).First().salary1 < TT && 
        e.salaries.Where(i => i.to_date.Year == 9999).First().salary1 > TF) 
       select e);