Question

Invoice Number = Now.Year & Now.Month & ?????

如何在表单加载时添加5位自动递增的数字？

预期的输出

20120100001

20120100002

Now.Month Problems＃

当月份为一位数时，发票将为10位数，而当为两位数时，发票将为12位数？

输出

20121 ?????

预期输出

201201 ?????

Answer 1

使用Now.Month.ToString("00")。

Dim str = DateTime.Now.Year & DateTime.Now.Month.ToString("00")

试试这个，

Sub Main()
    For i = 1 To 12
        Console.WriteLine(GetAutonumber(i))
    Next
End Sub

Public Function GetAutonumber(no As Integer) As String
    Dim strNum = no.ToString()
    Dim str = DateTime.Now.Year & DateTime.Now.Month.ToString("00") & New String("0", 5 - strNum.Length) & strNum
    Return str
End Function

发票编号自动递增

1 个答案: