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Notice how we re able to initialize the field to a default value right where we declare it, by using the = operator. (This sort of code is called, predictably enough, a field initializer.) Alternatively, we could have initialized it inside a constructor, but if the default is a constant value, it is conventional to set it at the point of declaration. What about the first example of a field that we saw the one we used as the backing data for a property in Example 3-12 We didn t explicitly initialize it. In some other languages that would be a ghastly mistake. (Failure to initialize fields correctly is a major source of bugs in C++, for example.) Fortunately, the designers of .NET decided that the trade-off between performance and robustness wasn t worth the pain, and kindly initialize all fields to a default value for us numeric fields are set to zero and fields of other types get whatever the nearest equivalent of zero is. (Boolean fields are initialized to false, for example.)

After each variable is filled with the post s values, a new RSSItem object is created by calling the RSSItem function (see Listings 7-8 and 7-12), and it is added to an array. Once all of the posts have been parsed and a corresponding RSSItem object has been created and added to the array, the function getItems concludes and returns the array called resultArray.

There s also a security reason for this initialization. Because a new object s memory is always zeroed out before we get to see it, we can t just allocate a whole load of objects and then peer at the uninitialized values to see if anything interesting was left behind by the last object that used the same memory.

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Defining a field for our scale factor is an improvement, but we could do better. Our 1.609344 isn t ever going to change. There are always that many kilometers per mile, not just for this instance of a Plane, but for any Plane there ever will be. Why allocate the storage for the field in every single instance Wouldn t it be better if we could define this value just once, and not store it in every Plane instance

C# provides a mechanism for declaring that a field holds a constant value, and will never, ever change. You use the const modifier, as Example 3-14 shows.

Then, once we have computed the first ciphertext block, we XOR the second block of plaintext with the first ciphertext block prior to running the second block through DES Doing so hides any patterns that would have shown up in the encrypted text, since each block of the ciphertext now depends upon all the previous plaintext blocks instead of just one plaintext block For example, even if the word security appears in the plaintext multiple times (aligned on 64-bit boundaries), the ciphertext for the word security will be different each time in the encrypted version of our file CBC is commonly used to avoid the problem of patterns in encrypted data There also are other methods of doing block cipher chaining for instance, CFB (cipher feedback mode) and OFB (output feedback method).

const double kilometersPerMile = 1.609344;

The platform now takes advantage of the fact that this can never change, and allocates storage for it only once, no matter how many instances of Plane you new up. Handy. This isn t just a storage optimization, though. By making the field const, there s no danger that someone might accidentally change it for some reason inside another function he s building in the class the C# compiler prevents you from assigning a value to a const field anywhere other than at the point of declaration.

In general, when we are developing software, we re trying to make it as easy as possible for other developers (including our future selves ) to do the right thing, almost by accident. You ll often hear this approach called designing for the pit of success. The idea is that people will fall into doing the right things because of the choices you ve made.

Some aspects of an object don t fit well as either a normal modifiable field or a constant value. Take the plane s identifier, for example that s fixed, in the sense that it never changes after construction, but it s not a constant value like kilometersPerMile. Different planes have different identifiers. .NET supports this sort of information through read-only properties and fields, which aren t quite the same as const.

In Example 3-5, we made our Plane class s Identifier property private. This prevented users of our class from setting the property, but our class is still free to shoot itself in the foot. Suppose a careless developer added some code like that in Example 3-15, which prints out messages in the SpeedInMilesPerHour property perhaps in order to debug some problem he was investigating.

We do not cover them here, but you can learn more in Bruce Schneier s Applied Cryptography: Protocols, Algorithms, and Source Code in C..

public double SpeedInMilesPerHour { get { return SpeedInKilometersPerHour / kilometersPerMile; } set { Identifier += ": speed modified to " + value; Console.WriteLine(Identifier); SpeedInKilometersPerHour = value * kilometersPerMile; } }

Listing 7-12. Adding a Parsed RSS XML Post to the Array resultArray[i] = new RSSItem(title, link, description, source, sourceLink, author, tags, comments, commentRss, pubDate, mediaLink, mediaType, lat, lon);

The first time someone tries to modify a plane s SpeedInMilesPerHour this will print out a message that includes the identifier, for example:

Unfortunately, the developer who wrote this clearly wasn t the sharpest tool in the box he used the += operator to build that debug string, which will end up modifying the Identifier property. So, the plane now thinks its identifier is that whole text, including the part about the speed. And if we modified the speed again, we d see:

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