LINQ's Distinct() on a particular property

Question

I am playing with LINQ to learn about it, but I can\'t figure out how to use Distinct when I do not have a simple list (a simple list of integers is pretty easy

Answer 1

Override Equals(object obj) and GetHashCode() methods:

class Person
{
    public int Id { get; set; }
    public int Name { get; set; }

    public override bool Equals(object obj)
    {
        return ((Person)obj).Id == Id;
        // or: 
        // var o = (Person)obj;
        // return o.Id == Id && o.Name == Name;
    }
    public override int GetHashCode()
    {
        return Id.GetHashCode();
    }
}

and then just call:

List distinctList = new[] { person1, person2, person3 }.Distinct().ToList();