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ISupportUndo interface exists to allow UI developers and framework authors to polymorphically invoke these three methods on any object that supports the concept The BusinessBase and BusinessListBase classes already implement this interface..

As it traces through a business object to take a snapshot of the object s state, UndoableBase may encounter child objects For n-level undo to work for complex objects as well as simple objects, any snapshot of object state must extend down through all child objects as well as the parent object I discussed this earlier with the InvoiceEdit and LineItem example When BeginEdit() is called on an InvoiceEdit, it must also take snapshots of the states of all its LineItem objects because they re technically part of the state of the InvoiceEdit object itself To do this while preserving encapsulation, each individual object takes a snapshot of its own state so that no object data is ever made available outside the object, thus preserving encapsulation for each object.

Finally, an exception of type System::ExecutionEngineException can be thrown asynchronously. MSDN documents this exception as follows: Execution engine errors are fatal errors that should never occur. Such errors occur mainly when the execution engine has been corrupted or data is missing. The system can throw this exception at any time (see http://msdn.microsoft.com/library/default.asp url=/library/en-us/cpref/html/ frlrfsystemexecutionengineexceptionclasstopic.asp). It is also worth mentioning this exception because it shows the natural limits of .NET s reliability features. Sophisticated server products such as SQL Server 2005 can provide a certain degree of self-healing capability. For example, when the execution of a managed stored procedure causes a stack overflow, the server process itself and all managed stored procedures from other databases remain intact. Only the part of the application that caused the trouble has to be shut down. These self-healing capabilities are based on the CLR. When the CLR itself is in a bad state, you have definitely reached the limits of all these capabilities. As a result, you simply have to accept the fact that an ExecutionEngineException could be thrown. There is no sensible way to treat it. However, there is a sensible way to avoid it. Most cases of an ExecutionEngineException are not caused by the CLR itself, but by native code that illegally modifies either the internal state of the runtime or of memory on the managed heap. To avoid these illegal operations, restrict yourself to executing unsafe code in server products like SQL Server 2005 only when you really need to.

However, to complicate matters, a BeginEdit() call on a parent object does not cascade to its child objects when BeginEdit() is called through the IEditableObject interface This is because data binding, which uses IEditableObject, gets confused if that happens and the child objects will end up out of sync with the parent, resulting in very hard to debug issues with data bound interfaces In that case, UndoableBase simply calls a method on the child object to cascade the BeginEdit(), CancelEdit(), or ApplyEdit() call to that object It is then up to the individual child object to take a snapshot of its own data In other words, each object is responsible for managing its own state, including taking a snapshot and potentially restoring itself to that snapshot later UndoableBase implements CoreIUndoableObject, which simplifies the code in the class This interface defines the methods required by UndoableBase during the undo process.

There is a helper class called SafeHandle that allows you to benefit from all the reliability features discussed so far. SafeHandle is an abstract class that can be used to write a wrapper class. The following code shows how you can modify the XYZHandle class from the previous examples: // ManagedWrapper4.cpp // build with "CL /LD /clr ManagedWrapper4.cpp"

A child object could also be a collection derived from BusinessListBase Notice that BusinessListBase implements the CoreIEditableCollection interface, which inherits from the CoreIUndoableObject interface..

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