Object Oriented Programming using C#

Object Oriented Programming using C#

Case Study

Note it is possible that a client could not be found – hence the try catch block in the code above. This will be discussed

in the next section.

11.9 Programming the Client Classes

The system needs a Client class, with methods to decrease the client’s credit (when a message has been displayed for

them). Ultimately it will also need a method to allow a client to pay for and increase their credit but we will not add this

functionality in the first version of this system. This class is simple and is very similar to programming the Message class

and is therefore not shown here.

Programming the ClientBook class is also similar to programming MessageSet, class however there are a few significant

differences :-

•    All clients have a ClientID so ClientBook uses a sorted dictionary instead of a Set.

•    The method GetClient() could fail if no client exists with the specified ClientID. We need to build in

protection in case a client cannot be found.

•    The method AddClient() could also fail if a client already exists with the specified ID.

The complete ClientBook class (without comments) is shown below. By downloading the finished program this code can

be viewed with embedded comments.





  

   



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