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The LightingController class has no foreach functionality built in. Here is where the yield keyword comes in. The yield keyword is a powerful construct that allows you to add foreach support to a type. The following is the code to implement an iterator using the yield keyword (you ll also need to add using System.Collections; to the top of the LightingController file, to gain access to the IEnumerable interface). public IEnumerable RoomGroupingIterator() { RoomGrouping curr = _roomGroupings.Next as RoomGrouping; while (curr != null) { yield return curr.Description; curr = curr.Next as RoomGrouping; } } In the iterator, another while loop using the curr variable is created, but the magic is the bolded code. The yield keyword is used in conjunction with the return keyword. Don t think the return exits the function, but consider the yield/return combination as a way of doing some message passing. The yield keyword always boggles the mind of developers. The easiest way to understand it is by exploring how it works in conjunction with the foreach keyword: 1. The code encounters a foreach statement and sets up a context where a collection of elements is being iterated. The context involves retrieving a collection and making space for an individual element. 2. The code calls the collection iterator, which in the example means calling the method RoomGroupingIterator(). 3. RoomGroupingIterator() assigns the curr variable to the head of the room groupings doubly linked list. 4. A loop is performed as long as curr is not equal to null.

Many online stores allow shoppers to customize the products they buy. For example, when selling balloons (as BalloonShop does), it s recommended to let your customer choose the color of the balloon. In this chapter, you ll implement the product attributes feature in BalloonShop.

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5. The code encounters a yield return statement, which means to take the result after the return keyword and store it in the space for the individual element (step 1). 6. The code creates a bookmark of the last executed code in the iterator and jumps back into the foreach statement. 7. The foreach statement continues and executes code, which in the example is the comment // Do something with description. 8. When the foreach attempts another iteration, the previous bookmark is retrieved and the code immediately after the bookmark is executed. This results in the code curr = curr.Next as RoomGrouping in the method RoomGroupingIterator() being executed. 9. The loop continues, and steps 4 through 9 are executed until curr is null. 10. When curr is null, the iterator exits, causing an exit of the foreach loop. The hard part to comprehend is the mechanism used when yield return causes an exit and then resumption of execution. Programmers are not used to the idea that you can jump in and out of method and resume execution. Keep in mind that this works only in the context of a foreach and yield return combination. There is no other situation in C# where this applies, and it works because C# uses a bookmarking mechanism. The example illustrates yield in the context of a loop, but a loop is not necessary. The following code is a collection of three numbers: 1, 2, and 3. public IEnumerable NumberIterator() { yield return 1; yield return 2; yield return 3; }

Search engine optimization, or simply SEO, refers to the practices employed to increase the number of visitors a web site receives from organic (unpaid) search engine result pages. Today, the search engine is the most important tool people use to find information and products on the Internet. Needless to say, having your e-commerce web site rank well for the relevant keywords will help drive visitors to your site and increase the chances that visitors will buy from you and not the competition! In this chapter, we ll update BalloonShop so that its core architecture will be search engine friendly, which will help marketers in their efforts.

4. In the Scenario Name box, type Normal Weather Race Day Scenario. 5. Click OK. 6. Change the values in only the following cells: DOR2K: 75 DOR5K: 130 DOR10K: 120 DORHM: 100 DORM: 55 7. Click OK. 8. Click Show. 9. Click Close. Compare your results to Figure 5-10.

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