How to get a distinct list from a List of objects?

Question

I have a List someList.

class MyClass
{
    public int Prop1...
    public int Prop2...
    public int Prop3...
}

Answer 1

you need to use .Distinct(..); extension method. Here's a quick sample:

public class Comparer : IEqualityComparer
    {
        public bool Equals(Point x, Point y)
        {
            return x.X == y.X;
        }

        public int GetHashCode(Point obj)
        {
            return (int)obj.X;
        }
    }

Do not forget about GetHashCode.

Usage:

List p = new List();
// add items
p.Distinct(new Comparer());