Add the where clause dynamically in Entity Framework

Question

I have this sql statement

SELECT userID from users WHERE
(name='name1' AND username='username1') OR
(name='name2' AND username='username2') OR
(name='name3' AND username='username3') OR
..........
(name='nameN' AND username='usernameN')

How can I implement this statement with entity framework using LINQ?

Answer 1

You can use a beautiful thing called PredicateBuilder. Use it like this

var pr = PredicateBuilder.False<User>();
foreach (var name in names)
{
    pr = pr.Or(x => x.Name == name && x.Username == name);
}
return query.AsExpandable().Where(pr);