Remove duplicates from list of object

Question

I have MyObject with field: id, a, b, c, e, f and I have List with 500 000 items, now how can I remove all duplicate items with of the same value of the parameter a, c, f? <

Answer 1

Well you can always use LINQ Distinct() like this :

var matches = list.Distinct(new Comparer()).ToList();

But for Ditsinct() to work you need to impletemnt Comparer for your Class:

class Comparer : IEqualityComparer
{
    public bool Equals(MyObject x, MyObject y)
    {
        return x.a == y.a && x.c == y.c && x.f == y.f;
    }

    public int GetHashCode(MyObject obj)
    {
        return (obj.a + obj.c + obj.f).GetHashCode();
    }
}