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舊版的統一編號邏輯檢查已經不適用囉!
趕緊修正一下
Public Shared Function NEW_ValidateTaxID(ByVal vstrTaxID As String) As Boolean
'空值或非8碼或非純數字
If String.IsNullOrEmpty(vstrTaxID) OrElse vstrTaxID.Trim().Length <> 8 OrElse Not Integer.TryParse(vstrTaxID, Nothing) Then
Return False
End If
Dim TaxID_7 As Boolean = (vstrTaxID.Substring(6, 1) = "7")
Dim logics As Integer() = New Integer() {1, 2, 1, 2, 1, 2, 4, 1} '邏輯乘數
Dim Z As Integer = 0 '垂直乘積之和 全部加總
Dim Z1 As Integer = 0
Dim Z2 As Integer = 0
'邏輯乘數的數量與統編長度8碼一致
For i As Integer = 0 To logics.Length - 1
Dim num As Integer = Convert.ToInt32(vstrTaxID.Substring(i, 1)) '統編單一數字拆解
Dim j As Integer = num * logics(i) '乘積直寫並上下相加
Dim SumXX As Integer = (j \ 10) + (j Mod 10) '垂直乘積之和(上下數字相加)
If TaxID_7 AndAlso i = 6 Then '統編第7位數字是"7" && 走訪到統編第7位數字時
'"乘積之和"為"10"，但政府文件要我們取"0或1"兩種情況(不是10)來相加。
Z1 += 0
Z2 += 1
'Z 不理它
Else
Z += SumXX
Z1 += SumXX
Z2 += SumXX
End If
Next 'end for
'int old_checkNum = 10; '2023年以前的舊版
Dim checkNum As Integer = 5
If TaxID_7 Then
If (Z1 Mod checkNum = 0) OrElse (Z2 Mod checkNum = 0) Then
Return True
End If
ElseIf Z Mod checkNum = 0 Then
Return True
End If
Return False
End Function