如何解决我想将SQL转换为Linq查询
这是我想转换为Linq的SQL查询
SELECT
s.Studentname,COUNT(c.StudentId)
FROM
Students s,StudentCourses c
WHERE
s.StudentId = c.StudentId
GROUP BY
s.Studentname
这里是使用linq尝试在StudentDto Model中存储数据
var students = (from s in DbContext.students
join sc in DbContext.studentCourses on
s.StudentId equals sc.StudentId
group s by s.Studentname into grouped
select new StudentDto()
{
Studentname = s.StudentName,StudentEmail = s.StudentEmail,PhoneNumber = s.PhoneNumber,DateOfBirth = s.DateOfBirth,Password = s.Password,ConfirmPawword = s.ConfirmPawword,CourseCount = sc.count()
}
).ToList();
解决方法
一个idomatic LINQ查询将简单地是:
from s in db.Students
select new {s.StudentName,CourseCount = s.Courses.Count() };
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