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This has the get and set parts we d expect in a normal property, but the definition line is a little unusual: it starts with the accessibility and type as normal, but where we d expect to see the property name we instead have this[int index]. The this keyword signifies that this property won t be accessed by any name. It is followed by a parameter list enclosed in square brackets, signifying that this is an indexer property, defining what should happen if we use the square bracket element access syntax with objects of this type. For example, look at the code in Example 7-25.

Indexable ix = new Indexable(); Console.WriteLine(ix[10]); ix[42] = "Xyzzy";

After constructing the object, the next line uses the same element access syntax you d use to read an element from an array. But this is not an array, so the C# compiler will look for a property of the kind shown in Example 7-24. If you try this on a type that doesn t provide an indexer, you ll get a compiler error, but since this type has one, that ix[10] expression ends up calling the indexer s get accessor. Similarly, the third line has the element access syntax on the lefthand side of an assignment, so C# will use the indexer s set accessor.

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If you want to support the multidimensional rectangular array style of index (e.g., ix[10, 20]), you can specify multiple parameters between the square brackets in your indexer. Note that the List<T> class does not do this while it covers most of the same ground as the built-in array types, it does not offer rectangular multidimensional behavior. You re free to create a jagged list of lists, though. For example, List<List<int>> is a list of lists of integers, and is similar in use to an int[][].

The indexer in Example 7-24 doesn t really contain any elements at all it just makes up a value in the get, and prints out the value passed into set without storing it anywhere. So if you run this code, you ll see this output:

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It may seem a bit odd to provide array-like syntax but to discard whatever values are written, but this is allowed there s no rule that says that indexers are required to behave in an array-like fashion. In practice, most do the reason C# supports indexers is to make it possible to write classes such as List<T> that feel like arrays without necessarily having to be arrays. So while Example 7-24 illustrates that you re free to do whatever you like in a custom indexer, it s not a paragon of good coding style. What does any of this have to do with value types and immutability, though Look at Example 7-26. It has a public field with an array and also an indexer that provides access to the array.

// This class's purpose is to illustrate a difference between // arrays and indexers. Do not use this in real code! class ArrayAndIndexer<T> { public T[] TheArray = new T[100]; public T this[int index] { get { return TheArray[index]; } set { TheArray[index] = value; } } }

You might think that it would make no difference whether we use this class s indexer, or go directly for the array. And some of the time that s true, as it is in this example:

tab, and go to the Browsing section of options. Deselect Disable script debugging for Internet Explorer and other browsers (see Figure 9-15).

ArrayAndIndexer<int> aai = new ArrayAndIndexer<int>(); aai.TheArray[10] = 42; Console.WriteLine(aai[10]); aai[20] = 99; Console.WriteLine(aai.TheArray[20]);

Alice then has to log into DVD-Factory and give that web site her username and password so that DVD-Factory knows that it is Alice, an authenticated principal at PCs-R-Us, who is attempting to buy DVDs from them Authorization: While Alice is the trusted PCs-R-Us employee to order DVDs, Bob, another employee at PCs-R-Us, might be responsible for accounting and auditing He might also have a login and password to the DVD-Factory web site because he needs to see prices and orders placed, but he may not be allowed to place orders for DVDs himself Before accepting an order, the DVD-Factory web site conducts an authorization check to make sure that the logged-in user is allowed to place an order If Alice tries to order DVDs from PCs-R-Us, the web site will allow it, but if Bob attempts to order DVDs, the order will be rejected.

This swaps freely between using the array and the indexer, and as the output shows, items set through one mechanism are visible through the other:

42 99

However, things are a little different if we make this class store a mutable value type. Here s a very simple modifiable value type:

struct CanChange { public int Number { get; set; } public string Name { get; set; } }

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