Question

i have a problem with linq, i have the following code:

        Models.Users user = null;
        foreach (var item in db.Users)
        {
            if (item.username.Equals(username))
            {
                ausgabe = true;
                user = item;
            }
        }

        // linq, does not work
        user = null;
        var test = from u in db.Users
                   where u.username.Equals(username)
                   select u;
        user = (Models.Users)test;

at the runtime i get a error because test i IQueryable, but how to make this conversation?

Answer 1

It looks like the problem is casting a query to a user, when you want to execute the query, so probably:

user = test.SingleOrDefault();

(see also FirstOrDefault(), First(), and Single())

Also, for convenience and readability, can I suggest:

where u.username == username

(which also, in regular code, avoids the problem of u.username being null, and thus causing a NullReferenceException)