How to cancel a form close in Close Event?

问题

I'm sure this is very simple, but I can't find it. In the close event of an Access Form, how can I cancel closing the form? I have a test that counts the records in a table. If that table has records, I want to ask the user if they want to close or go back and work with them. So how do I cancel the close event?

回答1:

You can use the Unload event:

GlobalVar ButtonClicked

Private Sub Form_Open(Cancel As Integer)
     ButtonClicked = False
End Sub

Private ClickMe_Click(Cancel As Integer)
     ButtonClicked = True
End Sub

Private Sub Form_Unload(Cancel As Integer)
     If Not ButtonClicked Then
         Cancel = True
     End if
End Sub

Order of events for database objects

回答2:

Study and try this code, it worked for me. Replace necessary variable names with your chosen names. Paste the code in the form_unload Event of your form. WARNING!!!: After you perform this operation you will find it difficult to access your form in design and layout view

    Private Sub Form_Unload(Cancel As Integer)
        userresponse = MsgBox("Are you sure you want close? All your work wouldn't be saved", vbYesNo, "Database Information")
        Select Case userresponse
        Case 6
            Cancel = False
            'this line opens another form in my own case
            DoCmd.OpenForm "EngMenu"  

        Case 7
            Cancel = True
            'this line keeps my own form open in my own case
            DoCmd.OpenForm "UpdateForm"


        Case Else:

            MsgBox "You are not allowed to perform this operation", vbInformation, "Database Information"
        End Select
    End Subenter code here

回答3:

Use the "Form_BeforeUpdate(cancel as integer)" event and set cancel to True.

Notice that you simply will not be able to close at all unless you add some logic to actually allow updating the database.

来源：https://stackoverflow.com/questions/10818836/how-to-cancel-a-form-close-in-close-event

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