Question

如何将此sql statetment转换为LINQ to Entities？

SQL语句：

Select * from Departments where DepartmentID  in (Select DepartmentID from Employees where FirstName like '%FirstName%' or LastName like '%LastName%')

我只有WHERE =（等于），我不能做WHERE IN子句

LINQ to Entities：

from t in db.Departments
where
  t.DepartmentID == -->Should be IN not EQUALS
    ((from t0 in db.Employees
    where
      t0.FirstName.Contains("FirstName") ||
      t0.LastName.Contains("LastName")
    select new {
      t0.DepartmentID
    }).FirstOrDefault().DepartmentID)
select t

Answer 1

(from d in db.Departments
 join e in db.Employees
     on d.DepartmentID equals e.DepartmentID
 where e.FirstName.Contains("FirstName") ||
       e.LastName.Contains("LastName")
 select t).Distinct()

Answer 2

你可以用这个

var x = 
    (from t0 in db.Employees
    where
      t0.FirstName.Contains("FirstName") ||
      t0.LastName.Contains("LastName")
    select new {
      t0.DepartmentID
    }).FirstOrDefault().DepartmentID;

from t in db.Departments
where
  t.DepartmentID.contains(x.DepartmentID)
select t

将SQL转换为LINQ to Entities WHERE IN子句

2 个答案: