[英]Many to one relationship not shown on find and toList in Linq to entities code first
[英]LINQ to Entities error on ToList with a one-to-many attribute
每当我尝试运行以下代码
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类确实与工资保持一对多关系。 据我所知,错误是指.ToList()方法调用,但是删除它们并不能解决问题。
编辑:添加了更多的代码,希望有帮助。
我认为这部分是: e.salaries.ToList()
是问题所在。 您不必执行.ToList()
即可进行linq查询,请尝试不使用.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);
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.