Object Oriented Programming using C#

Object Oriented Programming using C#

Creating And Using Eceptions

Thus we could

a) write a catch block that would react to ALL of these exceptions by catching a SystemException, or we could

b) write a catch block that would catch any type of input \ output exceptions, IOExceptions, and ignore all

others or

c) we could be even more specific and catch only FileNotFoundExceptions.

Catching specific exceptions allows us to take specific remedial action e.g. given a FileNotFoundException we could explain

to the user of a program that the file was missing and allow them to specify an alternative file.

Catching general exceptions allows us to ensure no potentially fatal error causes our program to crash though we may

not be able to take very useful remedial action e.g. given any Exception we could close our program down but without

knowing what caused the exception we could not take specific remedial action.

In exactly the same way we can define sub classes of ApplicationException and catch these exception as and when

appropriate.

9.4 Throwing Exceptions

Having defined our own exception classes we must then ensure our methods generate, or throw, these exceptions when

appropriate. For example we would instruct a GetClient() method to throw an UnknownClientException when a client

cannot be found with the specified ID.

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