simple select query in linq

Question

Lets say I have a student table and I want to display the student with ID 1.

SELECT *
FROM STUDENT ST
WHERE ST.ID = 1

This is how I achive this in Linq.

StudentQuery = from r in oStudentDataTable.AsEnumerable()
                                     where (r.Field<int>("ID") == 1)
                                     select r;
            oStudentDataTable = StudentQuery.CopyToDataTable();

but what if I want to display the students with these ids 1,2,3,4,5..

SELECT *
FROM STUDENT ST
WHERE ST.ID IN (1,2,3,4,5)

How can I achieve this in Linq?

Answer 1

Use .Contains

var list = new List<int> { 1, 2, 3, 4, 5 };

var result = (from r in oStudentDataTable.AsEnumerable()
              where (list.Contains(r.Field<int>("ID"))
              select r).ToList();