Beliebiges Zahlensystem in Dezimal umrechnen

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public static long FromBase(int baseSize, int[] value)
{
    long sum = 0;

    for (int i = value.Length - 1, k = 0; i > -1; --i, ++k)
        sum += value[k] * (i > 0 ? (int)Math.Pow(baseSize, i) : 1);

    return sum;
}