HashCodeBuilder.cs

    /// <summary>
    /// "Fast"-implementation of building HashCode
    /// </summary>
    public static class HashCodeBuilder
    {
        internal const int Seedingprime = 42;
        internal const int Hashingprime = 37;

        public static int BuildHashCode(params object[] args)
        {
            if (args == null)
                return 0;

            unchecked
            {
                return args.Where(item => item != null).Aggregate(args.Length == 0 ? Seedingprime : 0, (current, item) =>
                {

                    if (item == null) return current;
                    if (item.GetType().IsArray) return BuildHashCode(((IEnumerable) item).Cast<object>().ToArray());
                    return current*Hashingprime + item.GetHashCode();
                });
            }
        }
    }