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.
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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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In C#, all exceptions are objects that are members of the ____ class or one of its derived classes.
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Like all other classes in the C# programming language, the Exception class is a descendant of the ____ class.
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An exception of the ____ class is thrown when an attempt is made to store an element of the wrong type within an array.
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An exception of the ____ class is thrown when an ongoing operation is aborted by the user.
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____ represents the degree to which a system is resilient to stress and able to maintain correct functioning.
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The creators of C# define an infrequent event in code as one that happens in less than ____ percent of all program executions.
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When you write a block of code in which something can go wrong, you can place the code in a(n) ____ block.
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Each ____ block can 'catch' one type of Exception.
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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.
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The Exception class contains a read-only property named ____ that contains useful information about an Exception object.
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____ blocks contain statements that can never execute under any circumstances because the program logic "can't get there."
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The ____ methods are used to convert string data to another data type, such as int, double, or bool, without fear of generating an exception.
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Typically, you use the ____ block to perform clean-up tasks that must occur, regardless of whether any errors occurred or were caught.
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You can terminate an application with the ____ method.
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The ____ block is used frequently with file input and output to ensure that open files are closed.
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____ 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.
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The memory location where the computer stores the list of locations to which the system must return is known as the ____.
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The system of passing an exception through a chain of calling methods is called ____ the exception.
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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.
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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.
Studying That Suits You
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Description
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.