BeforeSelectionDelete 事件 (Visio)Documents.BeforeSelectionDelete event (Visio)
在删除选定对象之前，发生此事件。Occurs before selected objects are deleted.
|SelectionSelection||必需Required||IVSELECTION[IVSELECTION]||要删除的选定对象。The selected objects that are going to be deleted.|
如果形状的Type属性是visTypeGroup (2) 或visTypePage (1), 则shape对象可用作BeforeSelectionDelete事件的源对象。A Shape object can serve as the source object for the BeforeSelectionDelete event if the shape's Type property is visTypeGroup (2) or visTypePage (1).
BeforeSelectionDelete事件表示将要删除选定的形状。The BeforeSelectionDelete event indicates that selected shapes are about to be deleted. 不论任何形状是否被锁定，都将发送此通知；但锁定的形状不会被删除。This notification is sent whether or not any of the shapes are locked; however, locked shapes aren't deleted. 若要查看某形状是否已锁定以防删除，请检查其 LockDelete 单元格的值。To find out if a shape is locked against deletion, check the value of its LockDelete cell.
BeforeSelectionDelete和BeforeShapeDelete事件的相似之处是, 它们都会在形状 (s) 删除前触发。The BeforeSelectionDelete and BeforeShapeDelete events are similar in that they both fire before shape(s) are deleted. 它们的区别在于，当单个操作删除多个形状时它们的行为方式不同。They differ in how they behave when a single operation deletes several shapes. 假定一个 “剪切” 操作删除三个形状。Suppose a Cut operation deletes three shapes. BeforeShapeDelete 事件触发三次并分别作用于三个对象中的每个对象。The BeforeShapeDelete event fires three times and acts on each of the three objects. BeforeSelectionDelete 事件触发一次，并作用于所选的要删除的三个形状所在的 Selection 对象。The BeforeSelectionDelete event fires once, and it acts on a Selection object in which the three shapes that you want to delete are selected.
如果您使用 Microsoft Visual Basic 或 Visual Basic for Applications (VBA)，则此主题中的语法描述的是一种通用而有效的事件处理方法。If you are using Microsoft Visual Basic or Visual Basic for Applications (VBA), the syntax in this topic describes a common, efficient way to handle events.
若要创建可运行加载项的 Event 对象，请使用 Add 方法，因为它适用于 EventList 集合。To create an Event object that runs an add-on, use the Add method as it applies to the EventList collection.
若要创建可接收通知的 Event 对象，请使用 AddAdvise 方法。To create an Event object that receives notification, use the AddAdvise method.
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