如何将此查询更改为linq到sql？

Question

查询：

select emp.empname as Name, dep.depname as Department 
from Employee as emp 
inner join Department as dep on emp.depid=dep.depid 
where emp.id='2' 

我怎样才能改变这LINQ to SQL的？

Answer 1

约：

from e in dc.Employee 
join d in dc.Department on e.depid equals d.depid 
where e.id == '2' 
select new 
{ 
    Name = e.empname, 
    Department = d.depname 
} 

Answer 2

var id = 2; 
var qry = from e in db.Employees 
      where e.Id == id 
      select new { 
       Name = e.EmpName, 
       Department = e.Department.DepName 
      }; 

（假设员工和部门之间的家长协会在DBML定义）

，如果你希望只有一个这样的：

var record = qry.Single(); 
Console.WriteLine(record.Name); 
Console.WriteLine(record.Department); 

Answer 3

这就是为什么LINQ如此优秀：没有理由甚至连接到Departments表到ge t它的工作：

from employee in db.Employees 
where employee.id == 2 
select new 
{ 
    Name = employee.empname, 
    Department = employee.Department.depname 
};