Generic IEqualityComparer and GetHashCode

Question

Being somewhat lazy about implementing lots of IEqualityComparers, and given that I couldn\'t easily edit class implementations of object being compared, I went with the fol

Answer 1

I needed to rewrite Henrik solution as a class implementing IEqualityComparer which gives this:

    public class GenericEqualityComparer : IEqualityComparer
    {
        private readonly Func _keyFunction;

        public GenericEqualityComparer(Func keyFunction)
        {
            _keyFunction = keyFunction;
        }

        public bool Equals(T x, T y) => EqualityComparer.Default.Equals(_keyFunction(x), _keyFunction(y));

        public int GetHashCode(T obj)=> EqualityComparer.Default.GetHashCode(_keyFunction(obj));
    }