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virtual property int Prop { int get() override { return prop; } void set(int value) override { prop = value; } } }; The virtual keyword may also be applied to the individual get and set methods rather than to the property, as in Listing 8-12. This might be useful if you are only overriding one of the accessors, or if you need to make one nonvirtual and one virtual. Listing 8-12. Using Virtual Accessors // virtual_properties2.cpp using namespace System; using namespace System::Collections::Generic; value class Isotope { public: property unsigned int IsotopeNumber; property unsigned int AtomicNumber; property double Mass; }; ref class Element { double atomicWeight; public: property unsigned int AtomicNumber; property String^ Name; property String^ Symbol; property double AtomicWeight { virtual double get() { return atomicWeight; } void set(double a) { atomicWeight = a; } } Element(String^ name, String^ symbol, double a, double n)

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Figure 1-13 Business logic centralized in the Business layer The tools for addressing this seemingly intractable set of requirements are mobile business objects that encapsulate the application s data along with its related business logic It turns out that a properly constructed business object can move around the network from machine to machine with almost no effort on your part The NET Framework itself handles the details, and you can focus on the business logic and data By properly designing and implementing mobile business objects, you allow the NET Framework to pass your objects across the network by value, thereby copying them automatically from one machine to another.

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Figure 12-2. Inserting a breakpoint After selecting this item, you can see that a breakpoint is added to the line of code by a red circle placed in the leftmost margin and the line of code selected highlighted in red. Figure 12-3 demonstrates this.

The authorization rules behavior in ReadOnlyBase is virtually identical to that in BusinessBase, with the exception that only read operations need to be checked. Since the intent is to create a read-only object, there s no reason to support checking authorization rules for writing to a property. An AuthorizationRules object will be used to manage the roles for each property: [NotUndoable()] private Security.AuthorizationRules _authorizationRules = new Security.AuthorizationRules(); protected Security.AuthorizationRules AuthorizationRules { get { return _authorizationRules; } } Then the same CanReadProperty() methods are implemented as in BusinessBase. I won t repeat them here, as they are literally the exact same code: three different overloads of the method to support different scenarios. And the primary implementation is a virtual method, allowing a business developer to alter the authorization behavior if needed.

This means that with little extra code, you can have your business logic and business data move to the machine where the Interface Control layer is running, and then shift to the machine where the Data Access layer is running when data access is required At the same time, if you re running the Interface Control and Data Access layers on the same machine, then the NET Framework won t move or copy your business objects They re used directly by both tiers with no performance cost or extra overhead You don t have to do anything to make this happen, either NET automatically detects that the object doesn t need to be copied or moved, and thus takes no extra action The Business layer becomes portable, flexible, and mobile, and adapts to the physical environment in which you deploy the application.

The WS-Transactions specifications define the mechanism for how applications running across Web Services domains can interoperate in a transactable manner. It is also designed to provide a means of composing transactional quality-of-service attributes into Web Services applications. The transaction standards are built on a number of other standards, including WS-Coordination for an extensible coordination framework, and specific types for different types of transactions, such as short-term atomic ones (WSAtomicTransaction) and longer-running business transactions (WS-BusinessActivity). WCF aims to allow these diverse specifications to be programmable using a single attribute-driven API. Later in this chapter, you ll build some simple WCF applications that implement security, reliability, and transactability under the hood so you won t have to worry about the complexity of dealing with their messaging structure manually.

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