如果那么声明＆amp;等于参考访问VBA

Question

我有一个小问题，我认为某人（显然比我聪明）可以帮助指导我。出于某种原因，我无法使其正常工作：

＆安培; me.prepayment_month =“”

Prepayment_Month是所有月份的下拉列表。如果我输入一个月，并逐步执行代码，则会识别月份。我的问题是什么时候它是空白的。它没有意识到这种情况。我试过Null，“”，空白，并且都没有被认出来。

Private Sub Add_Prepayment_Save()
DoCmd.Save acForm, "frmInvoices"
If Me.Rec_d_Prepayment = 0 Then
DoCmd.Save acForm, "frmInvoices"
End If
If Me.Rec_d_Prepayment <> 0 & Me.prepayment_month = " " Then
    MsgBox "Please Update Prepayment Month"
End If
If Me.Rec_d_Prepayment <> 0 & Me.prepayment_month <> "" Then
    MsgBox "This will be added to tblPrePayment"
End If
End Sub

-------更新1 ---------

Private Sub Add_Prepayment_Save()
DoCmd.Save acForm, "frmInvoices"
If Me.Rec_d_Prepayment = 0 Then
DoCmd.Save acForm, "frmInvoices"
End If
If Me.Rec_d_Prepayment <> 0 And Me.prepayment_month = "" Then
    MsgBox "Please Update Prepayment Month"
End If
If Me.Rec_d_Prepayment <> 0 And Me.prepayment_month <> "" Then
    MsgBox "This will be added to tblPrePayment"
End If
End Sub

Answer 1

＆符号在基于VB的语言中将字符串连接在一起。要实施逻辑AND运算符，请使用AND关键字。你正在做的是将零值粘贴到Me.prepayment_month的值。