How do you add dynamic 'where' clauses to a linq query?

Question

I\'ve got a User table with a bitmask that contains the user\'s roles. The linq query below returns all the users whose roles include 1, 4 or 16.

var users          


        

Answer 1

How's this? It is not dynamic linq, but accomplishes the goal.

private List GetUsersFromRoles(uint[] userRoles) 
{
    List users = new List();

    foreach(uint userRole in UserRoles)
    {
        List usersInRole = GetUsersFromRole(userRole);
        foreach(User user in usersInRole )
        {
            users.Add(user);
        }
    }
    return users;
}    

private List GetUsersFromRole(uint userRole) 
{
    var users = from u in dc.Users
            where ((u.UserRolesBitmask & UserRole) == UserRole)
            select u;

    return users;    
}