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The hardest part of implementing n-level undo functionality is that not only can child objects be added or deleted but they can be undeleted or unadded in the case of an undo operation. Csla. Core.BusinessBase and UndoableBase use the concept of an edit level. The edit level allows the object to keep track of how many BeginEdit() calls have been made to take a snapshot of its state without corresponding CancelEdit() or ApplyEdit() calls. More specifically, it tells the object how many states have been stacked up for undo operations. BusinessListBase needs the same edit level tracking as in BusinessBase. However, a collection won t actually stack its states. Rather, it cascades the call to each of its child objects so that they can stack their own states. Because of this, the edit level can be tracked using a simple numeric counter. It merely counts how many unpaired BeginEdit() calls have been made: // keep track of how many edit levels we have private int _editLevel; The implementations of CopyState(), UndoChanges(), and AcceptChanges() alter this value accordingly.

Thus, the code first processes the list of deleted child objects, and then moves on to process the list of active child objects. Both the DataPortal_Fetch() and DataPortal_Update() methods set the RaiseListChanged Events property to false before changing the collection, and then restore it to true once the operation is complete. Setting this property to false tells the base BindingList<T> class to stop raising the ListChanged event. When doing batches of updates or changes to a collection, this can increase performance.

The beauty of flexible deployment options is that even users using Sugar OnDemand can customize how SugarCRM works through the powerful, yet easy-to-use Module Builder and Studio tools. (We ll learn more about these in Parts 2 and 3 of

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The most common type of collection is one that is contained within a parent object to manage a collection of child objects for that parent; like ProjectResources and ResourceAssignments in the sample application.

Collection base classes don t implement Add() or Remove() methods directly because those are implemented by Collection<T>, which is the base class for BindingList<T>. However, they do need to perform certain operations any time that an insert or remove operation occurs. To accommodate this, BindingList<T> invokes certain virtual methods when these events occur. These methods can be overridden to respond to the events. Child objects also must have the ability to remove themselves from the collection. Remember the implementation of System.ComponentModel.IEditableObject in Clsa.Core.BusinessBase that code included a parent reference to the collection object and code to call a RemoveChild() method. This RemoveChild() method is part of the IEditableCollection interface implemented by BusinessListBase. The important thing to realize is that BusinessListBase does extra processing in addition to the default behavior of the BindingList base class: It moves deleted items to and from a DeletedList so items can be undeleted. It completely removes deleted items that are new (and thus not undeleted in an undo operation). It maintains any LINQ to CSLA indexes (as discussed in 14). It ensures that newly added child objects have an edit level corresponding to the collection s edit level. To do this, the methods listed in Table 13-3 are implemented.

Note that the parent object here might be a root object, or it might be a child itself child objects can be nested, if that s what the business object model requires. In other words, this concept supports not only root-child, but also child-grandchild and grandchild-to-great-grandchild relationships.

RemoveChild() RemoveItem() InsertItem()

this book.) This allows anyone using SugarCRM to customize it to meet their needs without having the burden of supporting a server and installation. In addition, they can leverage both the On-Demand and On-Site deployment options at no additional charge. This is handy so that one system can be used as a backup of the other, or one can be used as a development/staging system and the other as a production system. SugarCRM s growth has continued month after month since being founded as an open source project in 2004. To date, SugarCRM has been downloaded over 5.2 million times, with over 55,000 active systems in over 195 countries supporting nearly half a million users. In addition, SugarCRM has 4,500 paying customers that use the commercial versions of the product to power their enterprise.

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