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This chapter s example demonstrates how you can use indexers and the yield keyword to make the type look and feel like a standard collection. The example serves a purpose. However, was it a fair example I am trying to teach you how to write software in a very professional manner, which means software engineering. A linked list is part of that software engineering, but do people use linked lists today Not really. Should people know about linked lists Sure, just like you should know about how to add, even though you are going to use a calculator. So, if the example serves a purpose of illustrating some features of C#, and the example is not like what you are going to do, are the features useful Yes, the features are useful. The difference with the illustrated features and the examples is that I showed you how to write infrastructure code. Imagine building a house, and you need to create a number of trusses. To speed production of the trusses, you create jigs. Jigs serve no purpose in the building of the house other than making the mundane quicker. Similarly, indexers and yield make it simpler for you to develop classes that fit into the standard C# programming paradigm. You may need to create structural classes that do nothing other than keep all of the other pieces that do something working. And when you create structural classes, you will use indexers, and you will use the yield keyword. So in the end, when you think of indexers and the yield keyword, think of providing a mechanism to a class that makes your multiple elements appear like a C# collection.

In the preceding chapters, you will have implemented a functional product catalog for BalloonShop. However, the site still lacks the all-important search feature. The goal in this chapter is to allow the visitor to search the site for products by entering one or more keywords. You ll learn how to implement search result rankings, and how to browse through the search results page by page. You ll see how easy it is to add new functionality to a working site by integrating the new components into the existing architecture.

Why walk when you can run No, we won t talk about sports cars in this chapter. Instead, we ll analyze a few possibilities to improve the performance of the BalloonShop project.

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The data handle that we defined when adding the grouping is used when we add a room to a grouping. The idea of the handle is to provide a reference that the kernel can use. Since the handle is an instance of a RoomGrouping type, whenever a room is added to a grouping based on a handle, it is not necessary to find the room grouping. The handle is the room grouping, and all that is necessary is a type cast. The following demonstrates how to add a room to a room grouping. public void AddRoomToGrouping(object grouping, IRoom room) { RoomGrouping roomGrouping = grouping as RoomGrouping; if (roomGrouping == null) { throw new Exception( "Handle grouping is not a valid room grouping instance"); } Room oldRooms = roomGrouping.Rooms as Room; if (oldRooms == null) { roomGrouping.Rooms = new Room {ObjRoom = room }; } else { roomGrouping.Rooms.Insert(new Room {ObjRoom = room }); } } In the implementation of AddRoomToGrouping(), the first step is to cast the handle grouping to an instance of RoomGrouping. The cast used is the as operator, so that if the cast fails, it is only necessary to test if roomGrouping is not null. Executing the null test is absolutely vital; otherwise, you might perform operations that will cause an exception to be thrown. Once the handle has been cast to a RoomGrouping instance, to add a room to the linked list is trivial. Adding a room involves only assigning the head of the list if there are no rooms in the list, or calling the method Insert() if there are rooms.

Your e-commerce web site needs a way to receive payments from customers. The preferred solution for established companies is to open a merchant account, but many small businesses choose to start with a solution that s simpler to implement, where they don t have to process credit card or payment information themselves. A number of companies and web sites exist to help individuals or small businesses that don t have the resources to process credit card and wire transactions, and can be used to process the payment between companies and their customers. In this chapter, we ll demonstrate some of the functionality provided by one such company, PayPal.

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