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To change the state of an item, you can use the State menu (in the upper-right corner of the green strip) for any content type (except for images, as mentioned). Click it and a drop-down menu will appear, as shown in Figure 3-33.

Just like properties, you can put code into the indexer accessors that validates get and set requests. Listing 8-15 contains an example that checks to see whether a numeric argument is within the bounds of an array field and returns a default value rather than throw an exception if it is not. Listing 8-15. Validating Field Access with an Indexer using System; class Product { private string[] productNames = new string[] { "orange", "apple", "pear", "banana", "cherry" }; public string this[int index] { get { if (index >= 0 && index < productNames.Length) { return productNames[index]; } else { return "no name"; } } } } class Listing 15 { static void Main(string[] args) { // create a new product Product p = new Product();

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// get some values via the indexer Console.WriteLine("Indexer value -1: {0}", p[-1]); Console.WriteLine("Indexer value 0: {0}", p[0]); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } The indexer in Listing 8-15 is read-only because it implements only the get accessor. The code statements in the accessor check to see that the requested index is with the bounds of the array field. If the index is in bounds, then the array value at the index is returned. If the index is out of bounds, the no name string is returned. Compiling and running the code in Listing 8-15 produces the following results: Indexer value -1: no name Indexer value 0: orange Press enter to finish

In addition to technical approaches to determine how programs work, an attacker might also be able to blackmail or buy off insiders. An insider is an individual who works for the organization that builds the software, such as a software developer within a company. If the organization does not pay its software developers very well, you can imagine that it may not take much money to convince them to sell the secrets of how their organization s software works. Alternatively, if the software developer happens to have some skeletons in his closet, the attacker may be able to threaten the secrets off of him. Through a combination of technical and nontechnical approaches, such as fault injection and blackmail, respectively, a determined attacker will eventually be able gather enough information to reverse engineer a product. For all the reasons just given, it does not necessarily always make sense to assume that one can keep products and information systems secure simply by keeping information about how those systems work hidden. If you want your systems to be more secure, you may want to assume that the attacker knows exactly how the target system works. We suggest that you avoid solely practicing security by obscurity if better options exist. What you will discover in s 12 and 13 is that it is possible to design a secure system in which the design can be completely known to the public even to the attackers. In such a system, its security does not depend upon hiding the design details or the code from the attackers, but instead it depends on keeping certain keys secret.

One difference between indexers and properties is that indexers can have arguments. In fact, they can have more than one argument. Listing 8-16 contains an example, which also demonstrates the use of a computed indexer, where the return values are not obtained from an underlying collection field. Listing 8-16. An Indexer with Multiple Arguments using System; class Product { public int this[int arg1, int arg2] { get { return arg1 * arg2; } } } class Listing 16 { static void Main(string[] args) { // create a new product Product p = new Product(); // get some values via the indexer Console.WriteLine("Indexer value [10, 20]: {0}", p[10, 20]); // wait for input before exiting

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