Implement IEqualityComparer

Question

I would like to get distinct objects from a list. I tried to implement IEqualityComparer but wasn\'t successful. Please review my code and give me an explanation fo

Answer 1

You don't need to implement IEqualityComparer:

public class Message
{
    protected bool Equals(Message other)
    {
        return string.Equals(x, other.x) && string.Equals(y, other.y) && string.Equals(z, other.z) && string.Equals(w, other.w);
    }

    public override bool Equals(object obj)
    {
        if (ReferenceEquals(null, obj)) return false;
        if (ReferenceEquals(this, obj)) return true;
        if (obj.GetType() != this.GetType()) return false;
        return Equals((Message) obj);
    }

    public override int GetHashCode()
    {
        unchecked //Ignores overflows that can (should) occur
        {
            var hashCode = x;
            hashCode = (hashCode*397) ^ (y != null ? y.GetHashCode() : 0);
            hashCode = (hashCode*397) ^ (z != null ? z.GetHashCode() : 0);
            hashCode = (hashCode*397) ^ (w != null ? w.GetHashCode() : 0);
            return hashCode;
        }
    }

    public int x { get; set; }
    public string y { get; set; }
    public string z { get; set; }
    public string w { get; set; }
}