LINQ Query IList<string> to JSon Format - asp.net-mvc

Question

I have a Class that return a List of Users
public IList<RegisterUsers> GetUsers()
{
var query = (from up in _context.UserProfile
join um in _context.Membership on up.UserID equals um.UserID
select new RegisterUsers { ID = ua.UserID, FirstName = ua.FirstName, LastName = ua.LastName, LastLogIn = up.LastLogIn, Status = up.Status });
return query.ToList();
}
I call this class by doing the following on my Action
var UserRepository = new UserRepository();
var AllUsers = UserRepository.GetUsers();
var result = from c in AllUsers
select new List<string> { c.ID.ToString(), c.FirstName, c.LastName, c.LastLogIn,c.Status };
return Json(new { sEcho = param.sEcho,
iTotalRecords = result.Count(),
iTotalDisplayRecords = result.Count(),
aaData = result
},
JsonRequestBehavior.AllowGet);
The above code works fine and it return JSON data. But I'm trying o figure out why I get an error if I just attach the AllUsers directly to the aaData variable. Please see below.
var UserRepository = new UserRepository();
var AllUsers = UserRepository.GetUsers();
return Json(new { sEcho = param.sEcho,
iTotalRecords = AllUsers.Count(),
iTotalDisplayRecords = AllUsers.Count(),
aaData = AllUsers
},
JsonRequestBehavior.AllowGet);

Answer 1

I was able to Return a List by doing the following
var AllUsers = UserRepository.GetUsers().Select(p => new List<string> { p.UserID.ToString(), p.FirstName, p.LastName }).ToList();
Basically the above code just eliminates the following line of code
var result = from c in AllUsers
select new List<string> { c.ID.ToString(), c.FirstName, c.LastName, c.LastLogIn,c.Status };
Hopefully I was able to answer your question.