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Exam 11: Exception Handling

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Question 1

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If you are working on a professional project, Microsoft recommends that you use the general Exception class in a catch block.

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Question 2

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Most exceptions that are used by programmers derive from three C# classes. What are those classes?

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Most exceptions will derive from three c...

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Like all other classes in the C# programming language, the Exception class is a descendant of the ____ class.

Typically, you use the ____ block to perform clean-up tasks that must occur, regardless of whether any errors occurred or were caught.

The ____ block is used frequently with file input and output to ensure that open files are closed.

____ represents the degree to which a system is resilient to stress and able to maintain correct functioning.

An exception of the ____ class is thrown when an ongoing operation is aborted by the user.

Match each item with a statement below:

____ blocks contain statements that can never execute under any circumstances because the program logic "can't get there."

When you write a method that catches an Exception , your method does not have to handle it. Instead, you might choose to ____ the exception to the method that called your method.

To create your own Exception that you can throw, you can extend the ApplicationException class, which is a subclass of ____.

The following example shows how a programmer might avoid a division by zero error by explicitly checking for the error condition: if (gallonsOfGas != 0) mpg = milesDriven /gallonsOfGas; else mpg = 0; Another possible way to deal with this is to use exception handling mechanisms. What factors help the programmer decide which of these methods to use?

An exception of class _____________________________________________ is thrown when a method call is invalid for the object's current state.

If a finally block is associated with a try … catch pair, what are the three possible outcomes of the try that result in execution of the finally block?

The Exception class overrides ____ to provide a descriptive error message so a user can receive precise information about the nature of any Exception that is thrown.

The term ____________________ refers to any process that is crucial to an organization.

The int version of the TryParse() methods converts string data to an int . The first argument is the string that you want to convert, and the second argument is an out parameter that receives the result if the conversion is successful, or 0 if it is not. The method returns a Boolean value that indicates whether the conversion was successful. Write this method using exception handling techniques to ensure that the method returns correctly whether or not the conversion is successful. Use the method Convert.ToInt32(inputString) to do the conversion.

When you design classes containing methods that have statements that might throw exceptions, you can create the methods so they throw the Exception object but do not handle it. Why might you want to do this?

The object-oriented techniques used to manage errors make up the group of methods known as ____________________.

You can terminate an application with the ____ method.