使用LINQ连接执行内部连接。

var employeeInfo = from emp in db.Employees
                   join dept in db.Departments
                   on emp.Eid equals dept.Eid 
                   select new
                   {
                    emp.Ename,
                    dept.Dname,
                    emp.Elocation
                   };

通过Clever Human扩展表达式链语法答案:

如果你想对两个表中的字段进行过滤或选择，而不是只对其中一个表进行操作，你可以在Join方法的最终参数的lambda表达式中创建一个新对象，将这两个表合并在一起，例如:

var dealerInfo = DealerContact.Join(Dealer, 
                              dc => dc.DealerId,
                              d => d.DealerId,
                              (dc, d) => new { DealerContact = dc, Dealer = d })
                          .Where(dc_d => dc_d.Dealer.FirstName == "Glenn" 
                              && dc_d.DealerContact.City == "Chicago")
                          .Select(dc_d => new {
                              dc_d.Dealer.DealerID,
                              dc_d.Dealer.FirstName,
                              dc_d.Dealer.LastName,
                              dc_d.DealerContact.City,
                              dc_d.DealerContact.State });

有趣的部分是该示例的第4行中的lambda表达式:

(dc, d) => new { DealerContact = dc, Dealer = d }

…在这里，我们构造了一个新的匿名类型对象，该对象具有DealerContact和Dealer记录的属性，以及它们的所有字段。

然后，我们可以在筛选和选择结果时使用这些记录中的字段，示例的其余部分演示了这一点，该示例使用dc_d作为我们构建的匿名对象的名称，该对象的属性是DealerContact和Dealer记录。

var results = from c in db.Companies
              join cn in db.Countries on c.CountryID equals cn.ID
              join ct in db.Cities on c.CityID equals ct.ID
              join sect in db.Sectors on c.SectorID equals sect.ID
              where (c.CountryID == cn.ID) && (c.CityID == ct.ID) && (c.SectorID == company.SectorID) && (company.SectorID == sect.ID)
              select new { country = cn.Name, city = ct.Name, c.ID, c.Name, c.Address1, c.Address2, c.Address3, c.CountryID, c.CityID, c.Region, c.PostCode, c.Telephone, c.Website, c.SectorID, Status = (ContactStatus)c.StatusID, sector = sect.Name };


return results.ToList();

var list = (from u in db.Users join c in db.Customers on u.CustomerId equals c.CustomerId where u.Username == username
   select new {u.UserId, u.CustomerId, u.ClientId, u.RoleId, u.Username, u.Email, u.Password, u.Salt, u.Hint1, u.Hint2, u.Hint3, u.Locked, u.Active,c.ProfilePic}).First();

编写所需的表名，并初始化select以获得字段的结果。

从d1在dealercontract中加入d2在dealercontract中d1.dealearid = d2.dealerid select new {dealercontract.*}

试试这个:

     var data =(from t1 in dataContext.Table1 join 
                 t2 in dataContext.Table2 on 
                 t1.field equals t2.field 
                 orderby t1.Id select t1).ToList();