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Function CreateClass1() As Boolean
Dim cls As New clsTest
Dim varResult As Variant
MsgBox cls.ClassState, vbInformation, "Class Example"
varResult = cls.AddInvoice("ALFKI")
MsgBox cls.ClassState, vbInformation, "Class Example"
Set cls = Nothing
CreateClass1 = True
End Function
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Private This_ClassState As String
Private This_frm As Form
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Private Sub Class_Initialize()
This_ClassState = "Initialized"
End Sub
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Public Property Get ClassState() As String
ClassState = This_ClassState
End Property
clsTest µÄ Initialize ʼþÖеĴúÂëÉèÖÃÃûΪ ClassState µÄÖ»¶ÁÊôÐÔµÄĬÈÏÖµ¡£ClassState ½« Class ¶ÔÏóµÄµ±Ç°×´Ì¬·µ»Øµ½µ÷Ó÷½¡£¸Ã´úÂë²¢²»ÊÇΪÁËʹÓÃÄ¿µÄ£¬¶øÖ»ÊÇ˵Ã÷ÔÚʵʩÀàÄ£¿éʱ¿ÉÒÔʹÓõļ¼Êõ¡£

ÏÂÁгÌÐò˵Ã÷ÈçºÎ´Ó Class ¶ÔÏóÖмìË÷ ClassState ÊôÐÔ£º
Function GetClass1State() As String
Dim cls As New clsTest
Dim varResult as String
varResult = cls.ClassState
Set cls = Nothing
GetClass1State = varResult
End Function
¸Ã³ÌÐò´Ó Class ¶ÔÏóÖзµ»Ø Initialized£¬ËµÃ÷µ±¼Æ»®ÀàµÄ½á¹û¹¦ÄÜʱҪʹÓõĸÅÄî¡£Äú¿ÉÒÔ¶¨ÒåÀàËùÖ´ÐеIJÙ×÷£¬´ËÍ⣬¿ÉÒÔ¿¼ÂÇÈçºÎÔÚÄúµÄÀàÖÐʵÏÖ½Ó¿Ú¡£ÕâÓëÉè¼Æ´°ÌåÒÔ±ã´ÓÃÀѧ½Ç¶ÈÓäÔÃÓû§µÄ¸ÅÄîÊÇÒ»ÑùµÄ£¬²»¹ýÔÚÕâÖÖÇé¿öÖУ¬Ä¿±ê¹ÛÖÚÊÇʹÓà Visual Basic for Applications ±à³ÌµÄÈËÔ±¡£

´´½¨Ò»¸ö³ÌÐòÓÃ×÷ clsTest ÀàÄ£¿éµÄ AddInvoice ·½·¨¡£¸Ã´úÂëÀàËÆÓÚ±ê׼ģ¿éÖеĴúÂ룺
ÔÚ clsTest ÀàÄ£¿éÖд´½¨ÏÂÁгÌÐò£º
Function AddInvoice(custID As String) As Boolean
On Local Error GoTo AddInvoice_Err
Dim Msg As String
Dim lngOrderID As Long
Dim varResult As Variant
Set This_frm = Form_Orders
This_frm.Modal = True
This_frm.Visible = True
DoCmd.GoToRecord acForm, This_frm.Name, acNewRec
This_frm.CustomerID = custID
varResult = This_frm.SetShipTo
This_ClassState = "RecordActive=" & CStr(This_frm.OrderID)
AddInvoice = True
AddInvoice_End:
Exit Function
AddInvoice_Err:
Msg = "Error #: " & Format$(Err.Number) & vbCrLf
Msg = Msg & Err.Description
Err.Raise vbObjectError, "clsTest.AddInvoice", Msg
Resume AddInvoice_End
End Function
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¸Ã³ÌÐòʹÓüòµ¥±à³Ì¼¼Êõ´ò¿ª¡°¶©µ¥¡±´°Ì壬Ìí¼ÓмǼ²¢ÏÔʾ¼Ç¼½øÐб༭¡£Ê¹ÓÃÊý¾Ý·ÃÎʶÔÏó (DAO) ʱ£¬ÓÐÐí¶à¿ÉÒÔÓÃÓڸôúÂëµÄÔöÇ¿¹¦ÄÜ¡£ÀýÈ磬Äú¿ÉÒÔÐ޸ĴúÂëÀ´¼ìË÷¿Í»§µÄ×îºó¶©µ¥²¢¸´ÖÆËü£¬¶ø²»Óôò¿ª¡°¶©µ¥¡±´°Ì塣ΪÁË˵Ã÷Ä¿µÄ£¬±¾Ê¾ÀýʹÓô°Ìå±¾ÉíÀ´Ìí¼ÓмǼ¡£ ±£´æ²¢¹Ø±Õ clsTest ÀàÄ£¿é¡£
¸Ã³ÌÐòʹÓüòµ¥±à³Ì¼¼Êõ´ò¿ª¡°¶©µ¥¡±´°Ì壬Ìí¼ÓмǼ²¢ÏÔʾ¼Ç¼½øÐб༭¡£Ê¹ÓÃÊý¾Ý·ÃÎʶÔÏó (DAO) ʱ£¬ÓÐÐí¶à¿ÉÒÔÓÃÓڸôúÂëµÄÔöÇ¿¹¦ÄÜ¡£ÀýÈ磬Äú¿ÉÒÔÐ޸ĴúÂëÀ´¼ìË÷¿Í»§µÄ×îºó¶©µ¥²¢¸´ÖÆËü£¬¶ø²»Óôò¿ª¡°¶©µ¥¡±´°Ì塣ΪÁË˵Ã÷Ä¿µÄ£¬±¾Ê¾ÀýʹÓô°Ìå±¾ÉíÀ´Ìí¼ÓмǼ¡£ ÔÚ¡°Éè¼Æ¡±ÊÓͼÖдò¿ª¡°¶©µ¥¡±´°Ìå¡£
¸Ã³ÌÐòʹÓüòµ¥±à³Ì¼¼Êõ´ò¿ª¡°¶©µ¥¡±´°Ì壬Ìí¼ÓмǼ²¢ÏÔʾ¼Ç¼½øÐб༭¡£Ê¹ÓÃÊý¾Ý·ÃÎʶÔÏó (DAO) ʱ£¬ÓÐÐí¶à¿ÉÒÔÓÃÓڸôúÂëµÄÔöÇ¿¹¦ÄÜ¡£ÀýÈ磬Äú¿ÉÒÔÐ޸ĴúÂëÀ´¼ìË÷¿Í»§µÄ×îºó¶©µ¥²¢¸´ÖÆËü£¬¶ø²»Óôò¿ª¡°¶©µ¥¡±´°Ì塣ΪÁË˵Ã÷Ä¿µÄ£¬±¾Ê¾ÀýʹÓô°Ìå±¾ÉíÀ´Ìí¼ÓмǼ¡£ ÔÚÊÓͼ²Ëµ¥ÖУ¬µ¥»÷´úÂ룬Ȼºó¼üÈëÏÂÁгÌÐò£º
Public Function SetShipTo() As Boolean
Call CustomerID_AfterUpdate
SetShipTo = True
End Function
¡°¶©µ¥¡±´°ÌåµÄÀàÄ£¿éÖÐÐèÒªÓиóÌÐò£¬²ÅÄÜÖ§³Ö clsTest ÀàÄ£¿éʾÀý¡£¸Ã³ÌÐòµ÷Óà CustomerID ¿Ø¼þµÄ AfterUpdate ʼþ¡£ÐèÒª¸üд°ÌåÉϵġ°ÊÕ»õÕß¡±ÐÅÏ¢£¬ÕâÊǵ±Óû§´Ó CustomerID ÁбíÖÐÑ¡Ôñ¡°¿Í»§¡±Ê±Í¨¹ýÓû§½çÃæ´¥·¢µÄ¡£ÓÉÓÚ CreateClass1() ÑùÀý³ÌÐòÔÚ´úÂëÖÐÉèÖÃÁË CustomerID Öµ£¬Òò´ËÄÜÌṩһÖÖ´¥·¢ AfterUpdate ʼþºÍ¸üС°ÊÕ»õÕß¡±ÐÅÏ¢µÄ·½Ê½¡£


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ÀàÄ£¿éÒ²Ö§³Ö Terminate ʼþ¡£µ± Class ¶ÔÏ󳬳ö·¶Î§£¬»òͨ¹ý½«¶ÔÏó±äÁ¿ÉèÖÃΪ Nothing ´ÓÄÚ´æÖÐжÔØËüʱ£¬¸Ãʼþ´¥·¢¡£Terminate ʼþ·Ç³£ÖØÒª£¬ÒòΪÄúʹÓÃËüÀ´Çå³ýÀà±¾Éí³õʼ»¯µÄÈκζÔÏó»òÒýÓöÔÏ󡣶ÔÓÚ C++ ³ÌÐòÔ±£¬ÕâÀàËÆÓÚ Destructor

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Private Sub Class_Terminate()
DoCmd.Close acForm, This_frm.Name
Set This_frm = Nothing
MsgBox "Class Terminated", vbInformation, "Class Example"
End Sub
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Function CreateClass1() As Boolean
Dim cls As New clsTest
Dim varResult As Variant
MsgBox cls.ClassState, vbInformation, "Class Example"
varResult = cls.AddInvoice("ALFKI")
MsgBox cls.ClassState, vbInformation, "Class Example"
Set cls = Nothing
CreateClass1 = True
End Function
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