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The delegation pattern simplifies a number of thorny inheritance and domain design problems When incorporating the delegation pattern in your application, consider these principles: Use the delegation pattern when the behavior of an object should be open to customization and the nature or knowledge needed to implement that customization is outside the domain of the class In the AutomaticPerimeterDefenseGun example, the class encapsulates a weapon that shoots at targets, but deciding on which targets are friendly is outside its domain Delegates are particularly effective when implemented in the base class with multiple subclasses Each subclass can consistently employ the delegate without complicating the number or organization of subclasses An object should have a well-defined behavior in the absence of a delegate object (delegate==nil) In the -defendPerimeter method, the delegate is unconditionally sent the -gun:shouldShootAt: message.

There are a few loose ends to tie up in our application. In this section we look at additional uses for a tree view class in order to complete the functionality required in the MyAlbumExplorer application. This section is to demonstrate various features and functionality, rather than explain additional Windows Forms concepts. As a result, this section will be short on discussion and simply present the code required to make the described changes. There are three changes we will make here: 1 Display the image associated with a selected photograph node. 2 Permit the label text for a node to be edited. 3 Display the album or photo property dialog associated with a node.

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If the delegate is nil, the message returns nil, and the gun shoots at nothing a desirable trait in the absence of any targeting information See the absent behavior and consistency with nothing design patterns in 7 Similarly, an object should provide some natural baseline functionality when optional delegate methods are absent The -acquireTargets method in Listing 17-2 tests the delegate to see if it responds to -gun:prioritizeTargets: If it does, it passes the known target list to the delegate that will prioritize, filter, or possibly supply its own targets If the delegate doesn t implement the method, the gun uses the targets it obtained from its sensors Note that this is also consistent with the previous principle, as -responsesToSelector: will return NO if the delegate is nil An object should always provide context in the delegate message.

The Client Object Model uses a client runtime proxy that communicates with a Windows Communication Foundation (WCF) service. The service is located at /_vti_bin/ client.svc. To communicate, the client proxy sends batched XML commands and the WCF services respond with a result formatted using JavaScript Object Notation (JSON). Because all commands are batched together and the JSON notation is a compact form, the Client Object Model bandwidth use is kept to a minimum. Creating Client Object Model applications using a managed .NET client requires references to Microsoft.SharePoint.Client.dll and the Microsoft.SharePoint.Client.Runtime.dll. These files are located in the {SharePoint Root}\ISAPI folder. The Silverlight API uses two other assemblies as reference: Microsoft.SharePoint.Client.Silverlight.dll and Microsoft.SharePoint.Client.Silverlight.Runtime.dll. These files are located in {SharePoint Root}\TEMPLATE\LAYOUTS\ClientBin. To use the ECMAScript Client Object Model, you need to copy or reference the following JavaScript files that are located in the {SharePoint Root}\TEMPLATE\LAYOUTS folder:

The delegate methods in Listing 17-2 all include the Gun object that s sending the message to the receiver This allows the delegate to include the sender in its decision process, like telling the gun to stop firing if its ammunition gets too low Remember that a single delegate object might be set as the delegate for two, or a hundred, different objects Some delegates act as reusable traits, like the validation routine in Listing 17-1, that can be shared by arbitrary groups of similar objects..

Extract and Override is a powerful technique because it lets you directly replace the dependency without going down the rabbit hole (changing dependencies deep inside the call stack). That makes it quick

The hard way (the manual way) requires continuous effort through the development process. In the case of audit logging, it means calling the audit logging service each time it s needed.

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