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It lets that through because it s able to make that behave like we expect. This will in fact modify the Number property of the element in the array. And this is the rather subtle difference between an array and an indexer. With an array you really can work directly with the element inside the array no copying occurs in this example. This works because the C# compiler knows what an array is, and is able to generate code that deals directly with array elements in situ. But there s no way to write a custom indexer that offers the same flexibility. (There are reasons for this, but to explain them would require an exploration of the .NET Framework s type safety rules, which would be lengthy and quite outside the scope of this chapter.) Having established the root of the problem, let s look at what this means for List<T>.

Now that we are ready to debug, we are going to set a break point. A break point is like a bookmark that stops the execution of code at the point where you place it. In this way, you can inspect the code around the breakpoint to look for errors. It s better to show than explain, so let s create a breakpoint. Open the TechnoratiBlock.js file by double-clicking it in the Script Explorer. Right-click the line var resultXML = environment.getXml(reqUrl, "technorati");. The menu shown in Figure 9-18 will appear. Select Breakpoint Insert Breakpoint. The line should be highlighted in red.

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As new businesses take shape, new threats need to be identified and mitigated to allow for the continued success of those businesses. Over time, new businesses can use additional security technology to mitigate such threats. As your organization enters new businesses, it may be worthwhile to consider developing, buying, and deploying new technological solutions that help mitigate threats that did not exist prior to the organization s entry into that new business. Different types of businesses will be more sensitive to different threats, and will have different security goals to mitigate those threats. Understanding threats is important in determining a system s security goals. In the following section, we describe some sample threats and types of attacks to give you a flavor of some prototypical applications and threats they may face. Of course, keep in mind that there are many more types of computer security threats and attack types than those we list here.

The List<T> class gets no special privileges it may be part of the .NET Framework class library, but it is subject to the same restrictions as your code. And so it has the same problem just described the following code will produce the same compiler error you saw in the preceding section:

List<CanChange> numbers = new List<CanChange> { new CanChange() }; numbers[0].Number = 42; // Will not compile

One way of dealing with this would be to avoid using custom value types in a collection class such as List<T>, preferring custom reference types instead. And that s not a bad rule of thumb reference types are a reasonable default choice for most data types. However, value types do offer one compelling feature if you happen to be dealing with very large volumes of data. As Figure 7-1 showed earlier, an array with reference type elements results in an object for the array itself, and one object for each element in the array. But when an array has value type elements, you end up with just one object the values live inside the array, as Figure 7-3 illustrates. List<T> has similar characteristics because it uses an array internally.

For an array with hundreds of thousands of elements, the simpler structure of Figure 7-3 can have a noticeable impact on performance. For example, I just ran a quick test on my computer to see how long it would take to create a List<CanChange> with 500,000 entries, and then run through the list, adding the Number values together. Example 7-28 shows the code it uses the Stopwatch class from the System.Diagnos tics namespace, which provides a handy way to see how long things are taking.

Stopwatch sw = new Stopwatch(); sw.Start(); int itemCount = 500000; List<CanChange> items = new List<CanChange>(itemCount); for (int i = 0; i < itemCount; ++i) { items.Add(new CanChange { Number = i }); } sw.Stop(); Console.WriteLine("Creation: " + sw.ElapsedTicks); sw.Reset(); sw.Start(); int total = 0; for (int i = 0; i < itemCount; ++i) { total += items[i].Number; } sw.Stop(); Console.WriteLine("Total: " + total); Console.WriteLine("Sum: " + sw.ElapsedTicks);

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