LINQ的：从2数据表，其中从第一个表列ID =从第二个表

Question

列ID的SQL会是这样的

select GeneralData.id, GeneralData.name, GeneralData.last_name, Student.id 
from GeneralData Inner JOIN Student ON Student.id=GeneralData.id 

GeneralData被DT1 学生DT2 我想要得到的是DT3 选择有一些建议？

Answer 1

var query = 
      from s in db.Student 
      from g in db.GeneralData 
      where s.id == g.id 
      select new 
      { 
       g.id, 
       g.name, 
       g.last_name 
      }; 

Answer 2

尝试了这一点：

from t1 in db.Table1 
join t2 in db.Table2 on t1.field equals t2.field 
select new { t1.field2, t2.field3} 

Answer 3

var query = from data in dc.GeneralData 
join stud in dc.Students in data.id equals stud.id 
select new 
{ 
data.id, data.Name, data.LastName, stud.id 
}; 

Answer 4

像这样：

var result= (
     from general in db.GeneralData 
     join student in db.Student 
      on general.id=student.id 
     select new 
     { 
      general.id, 
      general.name, 
      general.last_name, 
      studentId=student.id 
     } 
    ); 

其中db是LINQ数据上下文

Answer 5

作为方法链：

dt2.Where(s=>s.id == 1) 
.Select(s=> new {Stud = s, Data= dt1.Where(g=>g.id == s.id)}).First() 
.Select(q=> new {q.Stud.id, q.Data.name, q.data.last_name}).FirstOrDefault();