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If you look at our Firefighter class, it had a single string property for a Name. With the Administrator, you can independently get and set the Title, Forename, and Surname. We then provided a special read-only property that returns a single formatted string for the whole Name. It uses a framework class called StringBuilder to assemble the name from the individual components as efficiently as possible.

AppendWithSpace is a utility function that does the actual work of concatenating the substrings. It works out whether it needs to append anything at all using a static method on string that checks whether it is null or empty, called IsNullOrEmpty; finally,

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may agree on a conversation key, or session key. (We use the terms conversation key and session key interchangeably.) A key issue with session keys (pardon the pun!) is how to have two parties agree upon one. Alice and Bob can meet at some physically secure place and agree on a password. The password can then be converted to bits,1 and be used to encrypt a session key that Alice sends to Bob (or vice versa). Alternatively, Alice could call Bob over the phone, and as long as the phone line is not wiretapped, they can decide on a password. That password can be used to exchange a conversation key in a similar way, which can then be used to securely communicate over some channel, such as an Internet socket. It is possible for Alice and Bob to agree upon a key without ever meeting or communicating over an alternate secure channel using an asymmetric cipher such as RSA or the Diffie-Hellman (DH) key exchange algorithm (described in Section 14.4.2).

it adds an extra space to separate the individual words. To do the roll call we want to write some code such as that in Example 4-16.

static void Main(string[] args) { FireStation station = new FireStation(); // A reference to Joe, Harry's number one Firefighter joe = new Firefighter { Name = "Joe" }; // A reference to Bill, the trainee FirefighterBase bill = new TraineeFirefighter { Name = "Bill" }; // Harry is back FireChief bigChiefHarry = new FireChief { Name = "Harry"}; // And here's our administrator - Arthur Administrator arthur = new Administrator { Title = "Mr", Forename = "Arthur", Surname = "Askey" }; station.ClockIn(joe); station.ClockIn(bill); station.ClockIn(bigChiefHarry); station.ClockIn(arthur);

station.RollCall(); } Console.ReadKey();

When you are designing a class framework it can often be a good idea to write some example client code. You can then ensure that your design is a good abstract model while supporting clean, simple code at pointof-use.

if (userItems[l].nodeType != 1) { } else if (userItems[l].firstChild != null) { switch (userItems[l].nodeName) { case "id" : { userID = userItems[l].firstChild.nodeValue; break; } case "screen_name" : { screenName = userItems[l] .firstChild.nodeValue; break; } case "location" : { location = userItems[l] .firstChild.nodeValue; break; } case "description" : { description = userItems[l] .firstChild.nodeValue; break; } case "profile_image_url" : { imageUrl = userItems[l] .firstChild.nodeValue; // HACK: twitter sometimes return url as blah.comsystem/blah // instead of blah.com/system/blah imageUrl = imageUrl .replace("comsystem", "com/system"); break; }

Clearly, we re going to need a FireStation class that is going to let our administrators and firefighters ClockIn (registering their presence in the station), and where we can do a RollCall (displaying their names). But what type is that ClockIn function going to take, given that we haven t specified any common base class that they share

An integrity key is used to compute message authentication codes (MACs). If both Alice and Bob share an integrity key, then they can use that key to compute MACs on messages they exchange to help them detect if an attacker may have tampered with the messages.

.NET comes to our rescue again. It turns out that every type in the system is derived from Object. Every one value types (struct) and reference types (class) alike, even the built-in types such as Int32. It is easy to see how that would work for a class declaration in C#. If you don t specify a particular base class, you get Object by default. But what about a struct, or enum, or the built-in types; what happens if we try to talk to them through their Object base class

Let s give it a try. This code snippet will compile and work quite happily:

// Int variable int myIntVariable = 1; object myObject = myIntVariable;

What happens under the covers is that the runtime allocates a new object and puts a copy of the value inside it. This is called boxing, and, as you might expect given that it involves allocating objects and copying values, it is relatively expensive when compared to a straightforward assignment. You can also convert back the other way:

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