CTW隨手記事

 

public bool CheckROCID(string idNo)
{
    if (idNo == null)
    {
        return false;
    }
    idNo = idNo.ToUpper();
    Regex regex = new Regex(@"^([A-Z])([1-2]\d{8})$");
    Match match = regex.Match(idNo);
    if (!match.Success)
    {
        return false;
    }

    ///建立字母對應表(A~Z)
    ///A=10 B=11 C=12 D=13 E=14 F=15 G=16 H=17 J=18 K=19 L=20 M=21 N=22
    ///P=23 Q=24 R=25 S=26 T=27 U=28 V=29 X=30 Y=31 W=32  Z=33 I=34 O=35 
    string alphabet = "ABCDEFGHJKLMNPQRSTUVXYWZIO";
    string transferIdNo = $"{(alphabet.IndexOf(match.Groups[1].Value) + 10)}" +
                          $"{match.Groups[2].Value}";
    int[] idNoArray = transferIdNo.ToCharArray()
                                  .Select(c => Convert.ToInt32(c.ToString()))
                                  .ToArray();
    int sum = idNoArray[0];
    int[] weight = new int[] { 9, 8, 7, 6, 5, 4, 3, 2, 1, 1 };
    for (int i = 0; i < weight.Length; i++)
    {
        sum += weight[i] * idNoArray[i + 1];
    }
    return (sum % 10 == 0);
}

參考資料：
中華民國國民身分證wiki

 

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