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With the n-level undo methods complete, it is possible to implement the methods that the UI will need in order to control the edit process on a collection. Remember, though, that this control is only valid if the collection is a root object. If it s a child object, then its edit process should be controlled by its parent object. This requires a check to ensure that the object isn t a child before allowing these methods to operate: Public Sub BeginEdit() If Me.IsChild Then Throw New _ NotSupportedException(My.Resources.NoBeginEditChildException) End If CopyState() End Sub Public Sub CancelEdit() If Me.IsChild Then Throw New _ NotSupportedException(My.Resources.NoCancelEditChildException) End If UndoChanges() End Sub Public Sub ApplyEdit() If Me.IsChild Then Throw New _ NotSupportedException(My.Resources.NoApplyEditChildException) End If AcceptChanges() End Sub All three methods are very straightforward and allow developers to create a UI that starts editing a collection with BeginEdit(), lets the user interact with the collection, and then either cancels or accepts the changes with CancelEdit() or ApplyEdit(), respectively. .net code 39 reader Code 39 Reader In VB. NET - OnBarcode
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