C# Chapter 11 Flashcards

Questions and Answers

C# has more than 100 defined Exception subclasses.

True

Errors you discover when compiling a program are considered to be exceptions.

False

You can deliberately generate a SystemException by forcing a program to contain an error.

True

You can place any number of statements in a try block, including those you know will never throw an exception.

True Signup and view all the answers

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

False Signup and view all the answers

In C#, all exceptions are objects that are members of the ____ class or one of its derived classes.

Exception Signup and view all the answers

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

Object Signup and view all the answers

An exception of the ____ class is thrown when an attempt is made to store an element of the wrong type within an array.

System.ArrayTypeMismatchException Signup and view all the answers

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

System.Data.OperationAbortedException Signup and view all the answers

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

Robustness Signup and view all the answers

The creators of C# define an infrequent event in code as one that happens in less than ____ percent of all program executions.

30 Signup and view all the answers

When you write a block of code in which something can go wrong, you can place the code in a(n) ____ block.

try Signup and view all the answers

Each ____ block can 'catch' one type of Exception.

catch Signup and view all the answers

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.

ToString() Signup and view all the answers

The Exception class contains a read-only property named ____ that contains useful information about an Exception object.

Message Signup and view all the answers

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

Unreachable Signup and view all the answers

The ____ methods are used to convert string data to another data type, such as int, double, or bool, without fear of generating an exception.

TryParse() Signup and view all the answers

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

finally Signup and view all the answers

You can terminate an application with the ____ method.

Environment.Exit() Signup and view all the answers

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

finally Signup and view all the answers

____ is the type of exception automatically generated if there is a problem opening a file, reading data from a file, or writing to a file.

IOException Signup and view all the answers

The memory location where the computer stores the list of locations to which the system must return is known as the ____.

call stack Signup and view all the answers

The system of passing an exception through a chain of calling methods is called ____ the exception.

propagating Signup and view all the answers

When you catch an Exception, you can print the value of the ____ property to display a list of methods in the call stack so you can determine the location of the Exception.

StackTrace Signup and view all the answers

Study Notes

C# Exception Handling Overview

C# defines over 100 Exception subclasses, enhancing error handling capabilities.
Compilation errors are not classified as exceptions; they occur before runtime.
SystemExceptions can be triggered intentionally by inducing errors in the code.
Try blocks can contain multiple statements, regardless of whether exceptions are expected.

Exception Class Fundamentals

All C# exceptions derive from the Exception class.
The Exception class is a descendant of the Object class, which is fundamental to all classes in C#.

Types of Exceptions

System.ArrayTypeMismatchException is thrown for type mismatch in arrays.
System.Data.OperationAbortedException occurs when a user aborts an ongoing operation.
The definition of an infrequent event is one occurring in less than 30% of program executions.

Exception Handling Mechanisms

Code that may fail should be enclosed in a try block to enable exception handling.
Each catch block targets a specific Exception type for precise error handling.
The Exception class provides a method to retrieve a descriptive error message through ToString().

Properties and Methods

The Exception class includes a Message property for detailed information about exceptions.
Unreachable blocks contain code that can never execute in the program flow.
TryParse() methods safely convert strings to different data types without exceptions.

Cleanup and Termination

The finally block is used for necessary cleanup tasks, executing regardless of prior errors.
Applications can be terminated using Environment.Exit() to end execution abruptly.

File I/O and Exceptions

IOException is the standard exception for issues related to file operations like reading or writing.
Finally blocks are commonly used with file handling to ensure resources are released properly.

Call Stack and Exception Propagation

The call stack maintains the list of method locations for returning control after execution.
Propagating the exception is the method of passing it through the chain of calling methods.
The StackTrace property offers a list of methods that were called leading up to the exception.

Custom Exceptions

Developers can create custom Exception classes to handle specific errors tailored to their applications, allowing for refined error management.

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Test your knowledge on C# exceptions with these flashcards from Chapter 11. Each card presents a statement about exception handling in C#, where you will determine if the statement is true or false. Perfect for reinforcing your understanding of error handling in C# programming.