CombineHashCodes

gistfile1.cs

public static int CombineHashCodes(params int[] hashCodes)
{
    if (hashCodes == null)
    {
        throw new ArgumentNullException("hashCodes");
    }

    if (hashCodes.Length == 0)
    {
        throw new IndexOutOfRangeException();
    }

    if (hashCodes.Length == 1)
    {
        return hashCodes[0];
    }

    var result = hashCodes[0];

    for (var i = 1; i < hashCodes.Length; i++)
    {
        result = CombineHashCodes(result, hashCodes[i]);
    }

    return result;
}

private static int CombineHashCodes(int h1, int h2)
{
    return (h1 << 5) + h1 ^ h2;

    //unchecked
    //{
    //    var hash = 17;

    //    hash = hash * 23 + h1;
    //    hash = hash * 23 + h2;

    //    return hash;
    //}
}