ComboBox.OnDirty 屬性 (Access)ComboBox.OnDirty property (Access)

設定或傳回表單或報表的 [ 屬性 ] 視窗中的 [ On Dirty ] 方塊中的值。Sets or returns the value of the On Dirty box in the Properties window of a form or report. 可讀寫的 StringRead/write String.



_運算式_代表**ComboBox** 物件的變數。expression A variable that represents a ComboBox object.


此屬性是很有用的以程式設計方式變更時觸發事件,Microsoft Access 所採取的動作。This property is helpful for programmatically changing the action that Microsoft Access takes when an event is triggered. 例如,在各個事件呼叫之間,您也許想要根據不同狀況下所引動的事件,來改變運算式的參數,或是從事件程序轉換到運算式或是巨集。For example, between event calls you may want to change an expression's parameters, or switch from an event procedure to an expression or macro, depending on the circumstances under which the event was triggered.

Dirty 事件發生於表單的內容或文字部分下拉式方塊變更。The Dirty event occurs when the contents of a form or the text portion of a combo box changes. 當您從索引標籤控制項中的某一頁移到另一頁時也會發生此事件。It also occurs when you move from one page to another page in a tab control.

OnDirty值會是下列其中一個下列命令,根據 [選擇建立器] 視窗中 (藉由選擇 [ On Dirty ] 旁的 [建立] 按鈕方塊物件的 [屬性] 視窗中存取):The OnDirty value will be one of the following, depending on the selection chosen in the Choose Builder window (accessed by choosing the Build button next to the On Dirty box in the object's Properties window):

  • 如果您選擇 [運算式建立器],值會是 =運算式,其中_expression_是來自 [運算式建立器] 視窗的運算式。If you choose Expression Builder, the value will be =expression, where expression is the expression from the Expression Builder window.

  • 如果您選擇巨集建立器,值會是巨集的名稱。If you choose Macro Builder, the value is the name of the macro.

  • 如果您選擇程式碼建立器,值會是 [Event Procedure]。If you choose Code Builder, the value will be [Event Procedure].

如果 [On Dirty] 方塊為空白,則此屬性值為空字串。If the On Dirty box is blank, the property value is an empty string.

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