No overload for method - retrieving from generic list

[Rene Canter]

Trying to run an NUnit test to store and retrieve an item and ensure that the item retrieved is the same as the item stored.

        public void TestStoreAndRetrieve()
        {
            Factory factory = Factory.GetInstance();
            IBookService bookSvc = (IBookService)factory.GetService(typeof(IBookService).Name);
            Book book1 = new Book("9781426829758", "Stock", "Dark Rival", "Masters of Time", "Brenda Joyce", "Time Travel");
            bookSvc.StoreBook(book1);
            Book book2 = bookSvc.RetrieveBook();
            Assert.AreEqual(book1, book2);
 

Getting an error that there is no overload for method RetrieveBook that takes 0 arguments.
I have updated all my code to put the books in a list, this is when the issues started. Not sure what I am supposed to be calling with RetrieveBook though.

    public interface IBookService : IService
    {
        void StoreBook(Book bookx);
        void StoreBookList(Book[] bookx);
        void RetrieveBook(Book bookx);
        Book[] RetrieveBookList(int maxcount);
        //Book RetrieveBook();
    }
 

        public void RetrieveBook(Book bookx)
        {
            FileStream loadStream = new FileStream("Book.bin", FileMode.Open, FileAccess.Read);
            IFormatter formatter = new BinaryFormatter();
            IList<Book> listBooks = formatter.Deserialize(loadStream) as IList<Book>;
            //Book bookX = formatter.Deserialize(loadStream) as Book;
            loadStream.Close();
            //return bookX;
        }
 

[Anton Zinchenko]

Method RetrieveBook have a param, so it can't be called without it...

        public void TestStoreAndRetrieve()
        {
            Factory factory = Factory.GetInstance();
            IBookService bookSvc = (IBookService)factory.GetService(typeof(IBookService).Name);
            Book book1 = new Book("9781426829758", "Stock", "Dark Rival", "Masters of Time", "Brenda Joyce", "Time Travel");
            bookSvc.StoreBook(book1);
            Book book2 = bookSvc.RetrieveBook(book1);
            Assert.AreEqual(book1, book2);
 

[Plater]

Yeah you clearly are calling:
Book book2 = bookSvc.RetrieveBook();
and also clearly have this line:
//Book RetrieveBook();

The error message is telling you what is wrong. (Although I wonder why you have your function calls the way you do)

[Rene Canter]

When i put book1 in

Book book2 = bookSvc.RetrieveBook(book1);
 

I get error cannot implicitly convert type 'void' to Domain.Book.

[Rene Canter]

Got it! Thanks for the help.

[hype261]

Look at your function declaration.

public void RetrieveBook(Book bookx)

You are telling the compiler that this function doesn't return anything. To return a Book change the definition to.

public Book Retrievebook(Book bookx)
{
//what ever logic you get to return your book goes here
return book; 
}

You will also need to change the method definition in your interface IBookService.