static void Main(string[] args)
{
//variable to determine when the user is done entering books
bool done = false;
//instantiate an instance of the context
BooksContext library = new BooksContext();
//make sure that the table exists, and create it if it does not already exist.
library.Database.EnsureCreated();
while (!done)
{
//ask the user for a book to add
Console.WriteLine("Do you want to 'review' the books, 'add' a book, 'update' a book, or 'delete' a book? Type 'done' when finished.");
string action = Console.ReadLine();
if (action.ToLower() != "done")
{
if (action.ToLower() == "review" || action.ToLower() == "update" || action.ToLower() == "delete")
{
//display a listing of the books in the library
BooksContext.ReviewBooks(library.Books);
//what to do next if the user wants to update a book
if (action.ToLower() == "update")
{
//ask which book the user wishes to update
Console.WriteLine("Enter the ID of the book to update.");
string bookID = Console.ReadLine();
Book UpdatedBook = library.Books.Where(x => x.ID == int.Parse(bookID)).FirstOrDefault();
library.Update(BooksContext.GetBook(action, UpdatedBook));
library.SaveChanges();
BooksContext.ReviewBooks(library.Books);
}
//what to do next if the user wants to delete a book
else if (action.ToLower() == "delete")
{
string verify = "NO";
string bookID = "";
while (verify == "NO")
{
//ask which book the user wishes to delete
Console.WriteLine("Enter the ID of the book to delete or type 'CANCEL'.");
bookID = Console.ReadLine();
if (bookID == "CANCEL")
{
break;
}
Console.WriteLine("You have chosen to delete book " + bookID + ".");
Console.WriteLine("Is the correct? YES or NO?");
verify = Console.ReadLine();
}
if (bookID != "CANCEL")
{
Book DeleteBook = library.Books.Where(x => x.ID == int.Parse(bookID)).FirstOrDefault();
library.Remove(DeleteBook);
library.SaveChanges();
BooksContext.ReviewBooks(library.Books);
}
}
}
else if (action.ToLower() == "add")
{
//call method to get the book object to add.
//add the newly created book instance to the context.
//notice how similar this is to adding an item to a list.
library.Add(BooksContext.GetBook(action, null));
//ask the context to save any changes to the database
library.SaveChanges();
//use a foreach loop to loop through the students in the context
//notice how similar this is to looping through a list
BooksContext.ReviewBooks(library.Books);
}
}
else
{
done = true;
}
}
}
