Sha256: 83eff468bafc19f6b781310651035e94f0fc270721dcc1f0292294fdd0babbaa
Contents?: true
Size: 611 Bytes
Versions: 116
Compression:
Stored size: 611 Bytes
Contents
using System;
using System.Text.RegularExpressions;
public static class IsbnVerifier
{
public static bool IsValid(string number)
{
number = number.Replace("-", "");
if (!Regex.IsMatch(number, @"^(\d{9}[\dX])$"))
{
return false;
}
var sum = 0;
var weight = 10;
var digit = 0;
for (int i = 0; i < number.Length; i++)
{
digit = (number[i] == 'X' && i == 9) ? 10 : (int)Char.GetNumericValue(number[i]);
sum += digit * weight;
weight--;
}
return sum % 11 == 0;
}
}
Version data entries
116 entries across 116 versions & 1 rubygems