我是linq的初学者,有三个表(sql ce 3.5),如下所示: 课程:(PK)CourseCode,CourseName 类:(PK)ClassCode,FieldCode,ClassName ClsCrs:(PK)ClassCode,(PK)CourseCode
我想将此查询转换或重写为linq并将结果分配给组合框数据源:
`SELECT CourseName FROM class, clscrs, course WHERE
ClassTitel = @ClassTitel and class.classcode = clscrs.classcode and
clscrs.coursecode = course.coursecode`
我该怎么做?
感谢
答案 0 :(得分:1)
你可以试试这个
var query = (from c in db.class
from v in db.clscrs
from n in db.course
where c.ClassTitel=="yourinput"
&& c.classcode = v.classcode
&& v.coursecode = n.coursecode
select n.CourseName).ToList();
答案 1 :(得分:0)
不清楚哪个表ClassTitel字段属于哪个(假设类表)。还要将集名称替换为EF或Linq生成的集合名称
var query = from cl in db.class
join cc in db.clscrs on cl.classcode equals cc.classcode
join cs in db.course on cc.coursecode equals cs.coursecode
where cl.ClassTitel == "value"
select cl.CourseName;
comboBox1.DataSource = query.ToList();