C# Generic IEqualityComparer

ArrayComparer.cs

[Serializable]
    private class ArrayComparer<T> : IEqualityComparer<T>
    {
        private static Type _type;
        private static int  _size;
        public bool Equals(T x, T y)
        {
            if(x == null || y == null)
                return false;
            if(_type == null)
                _type = x.GetType();
            return _type.IsArray ? Converters.GetBytesObject(x, _type).Compare(Converters.GetBytesObject(y, _type)) : x.Equals(y);
        }
        public int GetHashCode(T item)
        {
            if(_type == null)
            {
                _type = item.GetType();
                _size = Converters.GetBytesObject(item, _type).Length;
            }
            return _type.IsArray ? Converters.GetBytesObject(item, _type).Aggregate(397, (current, b) => (current ^ b.GetHashCode()) * 31) ^ _size : (397 ^ item.GetHashCode()) * 31;
        }
    }