C# Exception Handling

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Questions and Answers

What is a poor coding style in exception handling?

Not using try-catch blocks

Not including a finally block

Catching less than three types of exceptions

Throwing more than three or four types of exceptions (correct)

What is the purpose of a finally block?

To skip executing code

To execute necessary code regardless of exception (correct)

To throw exceptions

To catch exceptions

What happens when an exception is rethrown?

The exception is ignored and not handled

The exception is caught and handled

The exception is propagated up the call stack (correct)

The exception is handled by the finally block

What should be the order of exception catch blocks?

Specific exceptions first, then general exceptions (D) Signup and view all the answers

What is unreachable code also known as?

Dead code (A) Signup and view all the answers

Why should exception types be generalized?

To make the code more maintainable (B) Signup and view all the answers

What should be avoided in exception handling?

Throwing too many types of exceptions (D) Signup and view all the answers

Why is it important to follow best practices in exception handling?

To make the code more maintainable and robust (C) Signup and view all the answers

What is the purpose of the `throw` keyword in C#?

To throw an exception (D) Signup and view all the answers

What happens when a method from another class throws an exception?

The calling program can catch the exception (B) Signup and view all the answers

How many statements can be placed within a try block?

Multiple statements (B) Signup and view all the answers

What is the order of placement for catch clauses?

From most specific to most generic (B) Signup and view all the answers

What is the advantage of using object-oriented exception-handling techniques?

To deal with exceptions appropriately as you decide how to handle them (C) Signup and view all the answers

What happens when multiple catch blocks are examined in sequence?

A match is found for the exception that occurred (C) Signup and view all the answers

Can multiple catch clauses be used to handle various exceptions?

Yes (D) Signup and view all the answers

Why is it important to handle exceptions appropriately?

To deal with exceptions appropriately as you decide how to handle them (D) Signup and view all the answers

What is the purpose of the NegativeBalanceException constructor in the provided code?

To throw an exception when the balance is negative (D) Signup and view all the answers

In the provided code, what happens when the balance is set to a negative value?

An exception is thrown (C) Signup and view all the answers

What is the purpose of rethrowing an exception in a catch block?

To let the calling method handle the problem (C) Signup and view all the answers

What is an exception object instantiated from?

Any condition that happens infrequently (C) Signup and view all the answers

What happens after an exception object is instantiated?

The object is thrown (A) Signup and view all the answers

What is the best practice for handling exceptions in a method?

Let the calling method handle the problem (A) Signup and view all the answers

Why should you use custom exception classes in C#?

To provide more information about the exception (D) Signup and view all the answers

What is the purpose of the constructors for user-defined exceptions in C#?

To throw an exception with a custom message (A) Signup and view all the answers

Study Notes

Handling Exceptions

Exceptions are thrown by the program using the throw keyword.
When methods from other classes throw exceptions, methods do not have to catch them, and the calling program can catch them.

Creating Multiple Exceptions

Multiple statements can be placed within a try block.
Only the first error-generating statement throws an exception.
Multiple catch blocks are examined in sequence until a match is found for the exception that occurred.
Various exceptions can be handled by the same catch block.
The order of placement is important, with the most specific exception first and the most generic last.

Order of Placement

catch clauses should be placed from most specific to most generic.
The Exception class should always be placed last.

Handling Multiple Exceptions

Multiple exceptions can be handled in a single try-catch block.
Each catch block should handle a specific type of exception.

Best Practices

It is poor coding style for a method to throw more than three or four types of exceptions.
Methods should not try to accomplish too many diverse tasks.
Exception types thrown should be generalized.
Unreachable blocks contain statements that can never execute under any circumstances.

User-Defined Exception Classes

Constructors can be used to create custom exception classes.
Custom exceptions can be used in a class to handle specific error conditions.

Rethrowing the Exception

The method that catches an exception does not have to handle it.
Within a catch block, the exception can be rethrown using the throw keyword with no object after it.
This allows the calling method to handle the problem.

Throwing an Exception

An exception object is instantiated when an exceptional condition occurs.
The exception object can be thrown using the throw keyword.
Exceptions should be used for infrequent conditions that occur in the program.

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Description

This C# code snippet demonstrates how to throw an exception when attempting to divide by zero. Learn about exception handling and best practices.