System.ArgumentNullException in entity framework

Question

Here's my DbContext. As you can see, the tables in database are named differently.

public class DataContext : DbContext {
    public DataContext() : base("name=connString") { }

    public DbSet<Person> Personer;
}

[Table("Users")]
public class Person {
    [Column("UserID")]
    public int ID { get; set; }
    [Column("UserFirstName")]
    public string Fornavn { get; set; }
    [Column("UserLastName")]
    public string Etternavn { get; set; }
}

Here's the code that generates System.ArgumentNullException: Value cannot be null. Parameter name: source.

using (var db = new DataContext()) {
    var x = db.Personer.Count();
}

Where does Personer get initialized with a value? The exception is telling you that it's null. — David
– David, Commented Jan 27, 2016 at 15:11

Jonathan Magnan · Accepted Answer · 2016-01-27 15:17:31Z

1

Personer must be a property not a field.

public class DataContext : DbContext {
    public DataContext() : base("name=connString") { }

    public DbSet<Person> Personer { get; set; }
}

answered Jan 27, 2016 at 15:17

Jonathan Magnan

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