CIHsieh

驗證身分證號

public static bool IsTaiwanID(string id)
{
    if (string.IsNullOrEmpty(id)) return false;
    if (id.Length != 10) return false;
    if (char.IsNumber(id[0])) return false;
    if (id[1] != '1' && id[1] != '2') return false;
    const string ABC = "10987654932210898765431320";
    var sum = ABC[id[0] - (id[0] < 97 ? 65 : 97)]-48;
    for (int i = 1; i < 8; i++)
        sum += (id[i] - 48) * (9 - i);
    sum += (id[8] - 48);
    sum += (id[9] - 48);
    return sum % 10 == 0;
}

產生身分證號

public static string RandomTaiwanID(
    char? location = null, 
    bool? isFemale = null, 
    string numbers = null)
{
    var tmp = new List<char>();
    var buf = new byte[10];
    using (var rng = RandomNumberGenerator.Create())
    {
        rng.GetBytes(buf);
    }
    if (location.HasValue)
    {
        if (!char.IsLetter(location.Value))
            throw new ArgumentException("location");
        tmp.Add(location.Value);
    }
    else
    {
        tmp.Add((char)(65 + (buf[0] % 26)));
    }
    if (isFemale.HasValue)
        tmp.Add(isFemale.Value ? '2' : '1');
    else
        tmp.Add((buf[1] & 1) == 1 ? '2' : '1');
    if (!string.IsNullOrEmpty(numbers))
        tmp.AddRange(numbers);
    for (int i = 2; i < buf.Length && tmp.Count < 9; i++)
        tmp.Add((char)(48 + (buf[i] % 10)));
    if (tmp.Count > 9)
        tmp.RemoveRange(9, tmp.Count - 9);
    var id = new string(tmp.ToArray());
    const string ABC = "10987654932210898765431320";
    var sum = ABC[id[0] - (id[0] < 97 ? 65 : 97)] - 48;
    for (int i = 1; i < 8; i++)
        sum += (id[i] - 48) * (9 - i);
    sum += (id[8] - 48);
    var d = sum % 10;
    if (d != 0)
        d = 10 - d;
    return id + (char)(d + 48);
}