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Now that we have covered some basics of how the Internet works, we will introduce our code example, a simple web server that we will be using to illustrate various security design concepts later in this chapter and the next. Before we present the code for the simple web server, we ll briefly review the basics of how web servers work. We have intentionally simplified our explanation so that we can focus on only the essential details, so if you re a web veteran, please don t be alarmed at how many details we ve omitted!

To see why we need this for anonymous types to be useful, look at Example 8-19 how would you declare the projected local variable if we weren t using var It s going to be some sort of IEnumerable<T>, but what s T here It s an anonymous type, so by definition we can t write down its name It s interesting to see how Visual.

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Studio reacts if we ask it to show us the type by hovering our mouse pointer over the variable Figure 8-2 shows the resultant data tip. Visual Studio chooses to denote anonymous types with names such as 'a, 'b, and so forth. These are not legal names they re just placeholders, and the data tip pop up goes on to show the structure of the anonymous types they represent. Whether or not you re using anonymous types in your projections, there s an alternative form of projection that you will sometimes find useful when dealing with multiple sources.

Earlier, Example 8-15 used a groupby clause to add some structure to a list of events the result was a list containing one group per day, with each group itself containing a list of events. Sometimes it can be useful to go in the opposite direction you may have structured information that you would like to flatten into a single list. You can do this in a query expression by writing multiple from clauses, as Example 8-21 shows.

var items = from day in eventsByday from item in day select item;

You can think of this as having roughly the same effect as the following code:

2.4.1. Hypertext Transfer Protocol (HTTP)

List<CalendarEvent> items = new List<CalendarEvent>(); foreach (IGrouping<DateTime, CalendarEvent> day in eventsByDay) { foreach (CalendarEvent item in day) { items.Add(item); } }

That s not exactly how it works, because the LINQ query will use deferred execution it won t start iterating through the source items until you start trying to iterate through the query. The foreach loops, on the other hand, are eager they build the entire flattened list as soon as they run. But lazy versus eager aside, the set of items produced is the same for each item in the first source, every item in the second source will be processed.

Notice that this is very different from the concatenation operator shown earlier. That also works with two sources, but it simply returns all the items in the first source, followed by all the items in the second source. But Example 8-21 will iterate through the source of the second from clause once for every item in the source of the first from clause. (So concatenation and flattening are as different as addition and multiplication.) Moreover, the second from clause s source expression typically evaluates to a different result each time around.

Open the MyBlocks folder, and double-click the TechnoratiBlockDescription.xml file to open it in the editor. Select all the XML, and copy and paste it into the Block Description editor in the Block Creator. Repeat the same steps for the TechnoratiBlock.js JavaScript code, but paste the code in the Block Code editor. Now, you should have both the description XML and the JavaScript code in the Block Creator. Click the Save button at the top-left corner of the Block Creator window (see Figure 10-9).

In Example 8-21, the second from clause uses the range variable from the first from clause as its source. This is a common technique it s what enables this style of query to flatten a grouped structure. But it s not mandatory you can use any LINQ-capable source you like; for example, any IEnumerable<T>. Example 8-22 uses the same source array for both from clauses.

int[] numbers = { 1, 2, 3, 4, 5 }; var multiplied = from x in numbers from y in numbers select x * y; foreach (int n in multiplied) { Console.WriteLine(n); }

The World Wide Web (WWW), or Web for short, is made up of a network of Internet servers ( web servers ) that serve Hypertext Markup Language (HTML) documents to web browser client applications. Web servers typically listen for connections coming from web browsers on port 80. After a web browser connects to a web server on port 80, it communicates with the web server using the Hypertext Transfer Protocol (HTTP). The first HTTP message that the browser sends to a server after connecting is typically of the following form: GET <filename> <http-version>

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