Linq not being recognized parse in query - asp.net

Question

I am trying to make a login page. When I try to receive the userdata with linq I get an exception because I try to use Parse in my query. I searched a bit online and found out it is because Linq doesn't recognize Parse. From what I understand I have to translate the not recognisable code to code that linq/slq recognises. Since I have just started using linq queries I have no idea how to accomplish this.
My query:
public static UserDetails GetUser(UserDetails userde)
{
var usr = from u in db.Users
join r in db.Roles on u.RoleId equals r.IdRole
where u.Email == userde.Email && u.Active == true
select new UserDetails
{ Firstname = u.Firstname,
Surname = u.Surname,
Email = u.Email,
Function = u.Function,
Password = u.Password,
Salt = u.Salt,
Userroles = (UserRoles)Enum.Parse(typeof(UserRoles), r.Role1)
};
return usr.FirstOrDefault();
}
I checked these articles:
linq to entities does not recognize method
linq to entities does not recognize the methods system object parsesystem type

Answer 1

you should first use FirstOrDefault() and parse it later. Otherwise linq is still trying to build the select-statement. After FirstOrDefault (or ToList,...) you have your result and can then parse it without problems.
Should be something like this:
public static UserDetails GetUser(UserDetails userde)
{
var usr = from u in db.Users
join r in db.Roles on u.RoleId equals r.IdRole
where u.Email == userde.Email && u.Active == true
select new UserDetails { Firstname = u.Firstname,
Surname = u.Surname,
Email = u.Email,
Function = u.Function,
Password = u.Password,
Salt = u.Salt,
// store the database-value in another property
UserrolesUnparsed = r.Role1
};
// get the database-results
UserDetails details = usr.FirstOrDefault();
// parse the database-value and set it to the property you want to
details.Userroles = (UserRoles)Enum.Parse(typeof(UserRoles), details.UserrolesUnparsed);
return details;
}
sure, there are better/cleaner methods, but this is just to explain you.