C# Exception Handling

24 Questions

What is a poor coding style in exception handling?

Throwing more than three or four types of exceptions

What is the purpose of a finally block?

To execute necessary code regardless of exception

What happens when an exception is rethrown?

The exception is propagated up the call stack

What should be the order of exception catch blocks?

Specific exceptions first, then general exceptions

What is unreachable code also known as?

Dead code

Why should exception types be generalized?

To make the code more maintainable

What should be avoided in exception handling?

Throwing too many types of exceptions

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

To make the code more maintainable and robust

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

To throw an exception

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

The calling program can catch the exception

How many statements can be placed within a try block?

Multiple statements

What is the order of placement for catch clauses?

From most specific to most generic

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

To deal with exceptions appropriately as you decide how to handle them

What happens when multiple catch blocks are examined in sequence?

A match is found for the exception that occurred

Can multiple catch clauses be used to handle various exceptions?

Yes

Why is it important to handle exceptions appropriately?

To deal with exceptions appropriately as you decide how to handle them

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

To throw an exception when the balance is negative

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

An exception is thrown

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

To let the calling method handle the problem

What is an exception object instantiated from?

Any condition that happens infrequently

What happens after an exception object is instantiated?

The object is thrown

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

Let the calling method handle the problem

Why should you use custom exception classes in C#?

To provide more information about the exception

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

To throw an exception with a custom message

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.

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

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