一个最好的例子

表名:TBL_Emp和TBL_Dep

var result = from emp in TBL_Emp join dep in TBL_Dep on emp.id=dep.id
select new
{
 emp.Name;
 emp.Address
 dep.Department_Name
}


foreach(char item in result)
 { // to do}

因为我更喜欢表达式链语法，下面是你如何做到这一点:

var dealerContracts = DealerContact.Join(Dealer, 
                                 contact => contact.DealerId,
                                 dealer => dealer.DealerId,
                                 (contact, dealer) => contact);

OperationDataContext odDataContext = new OperationDataContext();    
        var studentInfo = from student in odDataContext.STUDENTs
                          join course in odDataContext.COURSEs
                          on student.course_id equals course.course_id
                          select new { student.student_name, student.student_city, course.course_name, course.course_desc };

学生和课程表在哪里有主键和外键的关系

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(); 

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();

在linqc#内连接两个表

var result = from q1 in table1
             join q2 in table2
             on q1.Customer_Id equals q2.Customer_Id
             select new { q1.Name, q1.Mobile, q2.Purchase, q2.Dates }