C# Exception Handling in a Web Application
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Questions and Answers

What method is used to get books in the provided code snippet?

  • CheckForErrorResponse()
  • ReadFromJsonAsync()
  • CreateBook()
  • GetBooks() (correct)

In the context of the code snippet, what does the 'CreateBook(BookRequest book)' method do?

  • Retrieves a list of books
  • Updates an existing book
  • Deletes a book from the database
  • Creates a new book by sending a POST request (correct)

What does the '@page "/books"' directive indicate in the provided code snippet?

  • Specifies the encryption method for sending HTTP requests
  • Assigns the book title to a variable
  • Defines the route at which the BooksBase page will be accessible (correct)
  • Indicates the HTTP method used for creating books

Which method is used to handle HTTP POST requests for creating books in the presented code?

<p>[HttpPost] (D)</p> Signup and view all the answers

What type of dependency injection is being utilized in the code snippet?

<p>Scoped dependency injection (A)</p> Signup and view all the answers

Which method is responsible for checking and handling error responses in the provided code?

<p>CheckForErrorResponse() (B)</p> Signup and view all the answers

What is the purpose of the BookRepository class?

<p>To provide CRUD operations for <code>Book</code> entities (A)</p> Signup and view all the answers

What is the purpose of the AddAsync method in the BookRepository class?

<p>To add a new <code>Book</code> entity to the database (C)</p> Signup and view all the answers

What is the purpose of the UpdateAsync method in the BookRepository class?

<p>To update an existing <code>Book</code> entity in the database (D)</p> Signup and view all the answers

What is the purpose of the DeleteAsync method in the BookRepository class?

<p>To delete a <code>Book</code> entity from the database (C)</p> Signup and view all the answers

What is the purpose of the GetByIdAsync method in the BookRepository class?

<p>To retrieve a <code>Book</code> entity by its ID (D)</p> Signup and view all the answers

What is the purpose of the AnyAsync method in the BookRepository class?

<p>To check if any <code>Book</code> entities exist in the database (D)</p> Signup and view all the answers

What is the purpose of the DomainException class in the provided code?

<p>It represents an exception that occurs within the domain layer of the application. (D)</p> Signup and view all the answers

What is the purpose of the app.UseMiddleware() line in the provided code?

<p>It configures the application to use middleware components. (B)</p> Signup and view all the answers

Which part of the project structure represents the presentation layer?

<p>BookReview.BlazorWasm (D)</p> Signup and view all the answers

What is the purpose of the dotnet sln add command in the project setup section?

<p>It adds existing projects to the solution. (D)</p> Signup and view all the answers

Which part of the project structure likely contains data transfer objects (DTOs)?

<p>BookReview.Contracts (B)</p> Signup and view all the answers

What is the purpose of the dotnet add reference command in the project setup section?

<p>It adds a reference to another project within the solution. (D)</p> Signup and view all the answers

What is the purpose of the UpdateBook method in the service class?

<p>To update an existing book (A)</p> Signup and view all the answers

What happens if the id passed to the UpdateBook method does not exist in the _books list?

<p>The method will throw a <code>DomainException</code> with a 'Not Found' status code (B)</p> Signup and view all the answers

What is the purpose of the DeleteBook method in the service class?

<p>To delete a book (C)</p> Signup and view all the answers

What happens if the id passed to the DeleteBook method does not exist in the _books list?

<p>The method will throw a <code>DomainException</code> with a 'Not Found' status code (D)</p> Signup and view all the answers

What is the difference between Database First and Code First approaches in EF Core?

<p>Database First means the model is created based on the database, while Code First means the database is created based on the model. (D)</p> Signup and view all the answers

What NuGet packages are required to use EF Core in a .NET project?

<p>Microsoft.EntityFrameworkCore.Tools and Microsoft.EntityFrameworkCore.SqlServer (C)</p> Signup and view all the answers

What is the purpose of the controller action method UpdateBook?

<p>To update a book's information based on the provided request (C)</p> Signup and view all the answers

What will happen if a book with the same title already exists when using the CreateBook service method?

<p>A DomainException will be thrown indicating the title already exists (B)</p> Signup and view all the answers

In the GetBookById service method, what happens if no book is found with the provided ID?

<p>A DomainException with a 'not found' message is thrown (D)</p> Signup and view all the answers

What does the BookResponse object contain in the CreateBook controller action method?

<p>Id, Title, Author, and Year of the newly created book (D)</p> Signup and view all the answers

What is the purpose of the UpdateBook service method?

<p>To update an existing book's information in the system (C)</p> Signup and view all the answers

In the GetBookById controller action method, what type of exception is thrown if no book is found with the provided ID?

<p>DomainException with status code 'Not Found' (D)</p> Signup and view all the answers

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