Question

如何编写linq查询来访问多个表中的数据。如何为以下sql查询编写Linq查询： -

"select * from user,employee where user.Name='smith' and employee.company='xyz'"

Answer 1

这样的事情就可以做到。

var q = from u in db.user
        from e in db.employee
        where u.Name == "smith" && e.company == "xyz"
        select new
        {
           User = u,
           Employee = e
        };

Answer 2

这取决于您使用的linq提供商。例如，假设您正确定义了外键，实体框架会创建他们称之为“导航属性”的内容。因此，您可以轻松地以这种方式编写如上所述的linq查询：

var query = data.Where(employee => employee.Name == "Smith" && employee.Company.Name == "xyz");

Answer 3

var result = from u in context.User
             from e in context.Employee
             where (u.Name == "smith" && e.company == "xyz")

如何从多个表中访问数据

3 个答案: