Ive searched, maybe not long enough but search nonetheless, and couldn't find a object.property error like mine.
"An object reference is required for the non-static field, method, or property"
I couldnt find the fix. been almost 3 hours. Im using a linear search and searching for a match between book title and a search input. assuming Book.Title would work, it throws back an error.
public class Library
{
List<Book> books = new List<Book>();
public Library ()
{
}
public void AddBook(string title, string author, int id)
{
Book b = new Book (title, author, id);
}
public int Findbook(string Title)
{
string search = Title;
for (int i = 0; i < books.Count; i++)
{
//Error occurs here
if (search == Book.Title)
{
return i;
}
return -1;
}
}
public string DisplayBook()
{
return "";
}
public int booksCount()
{
int nextId = books.Count + 2;
return nextId;
}
public void removeid(int x)
{
int removeid = x + 1;
books.RemoveAt (removeid);
}
public override string ToString()
{
string t = "";
foreach (Book b in books)
{
t += (b + "\n");
}
return t;
}
}
}
Book Class
{
public class Book
{
private string author;
private string title;
private int id;
public string Author
{
get {
return this.author;
}
set {
author = value;
}
}
public string Title {
get {
return this.title;
}
set {
title = value;
}
}
public int Id {
get {
return this.id;
}
set {
id = value;
}
}
public Book (string title, string author, int id)
{
this.author = author;
this.title = title;
this.id = id;
}
public override string ToString ()
{
return title + "\t" + author + "\t" + id;
}
}
}
Main Class
class MainClass
{
public static void Main (string[] args)
{
Library lib = new Library ();
lib.AddBook ("C# programming", "Gesick", 4);
lib.AddBook ("java programming", "Roth", 2);
lib.AddBook ("C++ programming", "Franklin", 1);
lib.AddBook ("unity programming", "Preston", 3);
lib.AddBook ("graphics & multimedia", "Chastine", 5);
printMenu ();
string p = Console.ReadLine ();
p = p.ToUpper ();
char pick = p [0];
while (pick != 'Q') {
switch (pick) {
case 'A':
Console.WriteLine ("What is title of the book?");
string title = Console.ReadLine ();
Console.WriteLine ("Who is the author?");
string author = Console.ReadLine ();
int id = lib.booksCount ();
lib.AddBook (title, author, id);
//insert code here for adding a book
break;
case 'S':
Console.WriteLine ("Please Enter a book by Title");
string search = Console.ReadLine ();
int searched = lib.Findbook(search);
if (searched > -1)
{
Console.WriteLine ("Book Found!");
}
if (searched == -1)
{
Console.WriteLine ("Sorry that book is not in the Library");
}
else
{
Console.WriteLine("Sorry something went wrong");
}
//insert code here for finding a book and
//printing its details
break;
case 'D':
//insert code here for displaying all of the books in the library
// alphabetically by title
break;
case 'E':
//insert code here for displaying all of the books in the library
// alphabetically by author
break;
case 'F':
//insert code here for displaying all of the books in the library
// in ascending order by id num
break;
case 'R':
Console.WriteLine ("Select a Book by ID to Remove");
int removeid = int.Parse (Console.ReadLine ());
break;
default:
Console.WriteLine ("\nInvalid choice, please re-enter");
break;
}
printMenu ();
p = Console.ReadLine ();
p = p.ToUpper ();
pick = p [0];
}
Console.WriteLine ("good bye");
}
public static void printMenu ()
{
Console.WriteLine ("\nSelect one of the following:\n\n" +
" A to add a book to the library\n" +
" S to search for a book by title\n" +
" D to display the contents of the library, alphabetically by title \n" +
" E to display the contents of the library, alphabetically by author \n" +
" F to display the contents of the library, in ascending order by id num \n" +
" R to remove a book from the library\n" +
" Q to quit this program\n\n");
Console.Write ("enter choice here: ");
}
}
