Methods Reference for Adding UndoUnits to the Undo History

Topic Overview

This topic lists the available methods for adding an UndoUnit derived class object to the undo history.

The following table lists the topics required as a prerequisite to understanding this topic.

Topic	Purpose
UndoManager Properties and Methods Reference	This topic lists some of the important properties and methods of the UndoManager class.
UndoUnit Derived Classes, Properties and Methods Reference	This topic lists the derived classes and some of the important properties and methods of the UndoUnit class.

This topic contains the following sections:

The UndoManager class provides a number of helper methods that construct an UndoUnit and add the unit to the undo history.

The following table summarizes the purpose and functionality of the UndoManager methods for adding UndoUnits to the undo history.

Method	Description
AddChange	This is an UndoManager method that may be used to add any UndoUnit derived class object to the undo history. The method has numerous overloads. For all overloads except the AddChange(UndoUnit), the UndoUnit representing the change will automatically add itself back into the history (calling `AddChange` passing in itself). Therefore these delegates should not result in the same `AddChange` method being invoked. These methods ultimately delegate the creation of the UndoUnit instance to the UndoUnitFactory of the UndoManager whose history will be updated. It is possible to change the UndoUnit instance that is used for these operations without needing to change the call to these methods.
AddCollectionChange	This method adds an UndoUnit for collection change in the history. There are several overloads that take a collection of type ICollection<T> and information about the type of change that occurred in the collection as parameters.
AddPropertyChange	This method adds an PropertyChangeUndoUnitBase for the specified property value change to the undo history. The method has numerous overloads that take as parameters: the reference to the object whose property was changed the old value of the property the new value of the property additional information that identifies the property that was changed

The following topics provide additional information related to this topic.

Topic	Purpose
Methods Reference for Removing UndoUnits from the History	This topic lists the available methods for removing the UndoUnit instances from the undo/redo history.
Methods Reference for Registering and Unregistering Objects	This topic lists the methods that register/unregister a specific object to an UndoManager instance.
Methods Reference for Performing Undo Redo Operations	This topic lists the available methods for performing undo and redo operations.
Methods and Properties Reference for Performing Transactions	This topic lists the available methods and properties for performing undo/redo transactions.
Methods and Properties Reference for Merging Undo Redo Operations	This topic lists the available methods and properties related to the merging of undo/redo operations.
Methods Reference for Suspending and Resuming Saving History	This topic lists the available methods for suspending and resuming the saving of the undo/redo operations in history.
Methods and Properties Reference for Creating Custom UndoUnit	This topic lists the available methods and properties related to creating of a custom UndoUnit in the Infragistics Undo/Redo Framework™.