CTW隨手記事

public bool CheckUID(string idNo)
{
    if (idNo == null)
    {
        return false;
    }
    Regex regex = new Regex(@"^\d{8}$");
    Match match = regex.Match(idNo);
    if (!match.Success)
    {
        return false;
    }
    int[] idNoArray = idNo.ToCharArray().Select(c => Convert.ToInt32(c.ToString())).ToArray();
    int[] weight = new int[] { 1, 2, 1, 2, 1, 2, 4, 1 };

    int subSum;     //小和
    int sum = 0;    //總和
    int sumFor7 = 1;
    for (int i = 0; i < idNoArray.Length; i++)
    {
        subSum = idNoArray[i] * weight[i];
        sum += (subSum / 10)   //商數
             + (subSum % 10);  //餘數                
    }
    if (idNoArray[6] == 7)
    {
        //若第7碼=7，則會出現兩種數值都算對，因此要特別處理。
        sumFor7 = sum + 1;
    }
    return (sum % 10 == 0) || (sumFor7 % 10 == 0);
}

參考資料：
營利事業統一編號邏輯檢查方法

 

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