CompetitionBasicEqualityComparer.cs

namespace Vereinsmeisterschaften.Core.Models
{
    public class CompetitionBasicEqualityComparer : IEqualityComparer<Competition>
    {
        public bool Equals(Competition x, Competition y)
        {
            if (ReferenceEquals(x, y)) return true;
            if (ReferenceEquals(x, null)) return false;
            if (ReferenceEquals(y, null)) return false;
            if (x.GetType() != y.GetType()) return false;
 
            return (x.Gender, x.SwimmingStyle, x.Age).Equals((y.Gender, y.SwimmingStyle, y.Age));
        }

        public int GetHashCode(Competition obj)
            => obj == null ? 0 : (obj.Gender, obj.SwimmingStyle, obj.Age).GetHashCode();
    }
}