根据最后一个单元格值自动生成 VBA 代码到序列号

Question

我在通过在 A 列中添加最后一个单元格值来自动生成序列号时遇到问题。我能够生成序列号直到 BA00935（通过添加最后一个单元格值 BA00934）但不是了解为什么代码没有生成序列号 BA00936 as in this figure。我什至没有收到任何错误消息。

我怎样才能以正确的方式使用row_number，或者有什么替代方法可以达到预期的效果？

我已使用以下 VBA 代码通过添加到最后一行来生成序列号。

Private Sub cmdadd_Click()
On Error Resume Next
ActiveSheet.Unprotect
Dim LastRow As Long
'for giving the serial number based on last cell value by adding plus one
With ActiveSheet
    LastRow = .Cells(.Rows.Count, "A").End(xlUp).Row
    Range("A" & LastRow).Select
    Selection.AutoFill Destination:=Range("A" & LastRow & ":A" & LastRow + 1), Type:=xlFillDefault
    Range("A" & LastRow + 1).Select
End With

Pattern_Serial nos

Answer 1

假设字符串总是 7 个字符长并以 5 位数字结尾

Private Sub cmdadd_Click()
On Error Resume Next 'This line skips errors... bad practice unless you really know what you are doing
On Error GoTo 0
Dim LastRow As Long

With Workbooks(REF).Sheets(REF) 'Always refer to the wb/ws, otherwise VBA will refer to the active wb/ws

    .Unprotect

    'for giving the serial number based on last cell value by adding plus one
    LastRow = .Cells(.Rows.Count, "A").End(xlUp).Row
    prfx = Left(.Cells(LastRow, "A"),2) 'Gets the prefix by getting the 2 leftmost characters of the last filled cell
    nmbr = Right(.Cells(LastRow, "A"),5)+1 'Gets the last 5 characters, which is the number

    'Numbers don't have leading zeroes, so if the string did they have been stripped
    'This determines if that happened and if so, it adds as many leading zeroes as the number of characters is shorter than 5
    If Len(nmbr) < 5 Then 
        For i = 1 To (5 - Len(nmbr))
            nmbr = "0" & nmbr
        Next i
    End If
    .Cells(LastRow + 1, "A").Value = prfx & nmbr
End With
End Sub