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更新过程中对数据源执行命令前发生。
Public Event RowUpdating As ULRowUpdatingEventHandler
public event ULRowUpdatingEventHandler RowUpdating;
尝试进行更新时便会触发该事件。
要处理行正在更新事件，您必须创建一个 ULRowUpdatingEventHandler 委派，并将其附加到此事件。
Visual Basic 语法