Podcast
Questions and Answers
C# has more than 100 defined Exception subclasses.
C# has more than 100 defined Exception subclasses.
True
Errors you discover when compiling a program are considered to be exceptions.
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.
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.
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.
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.
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.
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.
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.
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.
____ 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.
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.
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.
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.
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.
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."
____ 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.
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.
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.
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.
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.
____ 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 ____.
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.
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.
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
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
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.
