I am working on my homework assignment and I am completely stuck! What I am trying to do is to use already defined input and save it to the file by using saveDataTo() method and read the input by using readDataFrom() method.
I am stuck on the first part. I am not sure if I have to initialize the data in Program.cs file first?
I don't know and I am stuck. Here is code and hope for some tips how I can accomplish this.
-- EDIT --
I can add instructions for purpose of both saveDataTo() and readDataFrom() methods:
The saveDataTo( ) method takes a parameter of BinaryWriter. The method writes the values of all 5 properties of an book object to a file stream associated with the writer (the association is done in the Main( ) method of Program class). There is no need to open and close the file stream and binary writer inside this method.
The readDataFrom( ) method takes a parameter of BinaryReader. The method reads the values of all five properties of the Book object from a file stream associated with the reader (the association is done in the Main( ) method of Program class). There is no need to open and close the file stream and binary reader inside this method.
So that gives me a clue that I should use and assign the properties to be saved in the file there?
-- EDIT --
Updated the code there. I do have a problem with content that is being saved into the file. I am not being showed the price. Why is that?
ff.APublisherNameTitle FirstNameLastName
Program.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
namespace Lab_7
{
class Program
{
private const string FILE_NAME = "lab07.dat";
static void Main(string[] args)
{
//char ask;
/*
do
{
Console.Write("Enter Book Title: ");
publication.Title = Console.ReadLine();
Console.Write("Enter Author's First Name: ");
book.AuthorFirstName = Console.ReadLine();
Console.Write("Enter Author's Last Name: ");
book.AuthorLastName = Console.ReadLine();
Console.Write("Enter Publisher's Name: ");
publication.PublisherName = Console.ReadLine();
Console.Write("Enter Book Price: $");
publication.Price = float.Parse(Console.ReadLine());
Console.Write("Would like to enter another book? [Y or N] ");
ask = char.Parse(Console.ReadLine().ToUpper());
}
while (ask == char.Parse("Y"));
*/
Book book = new Book();
book.Price = 10.9F;
book.Title = "Title";
book.PublisherName = "PublisherName";
book.AuthorFirstName = "FirstName";
book.AuthorLastName = "LastName";
FileStream fileStream = new FileStream(FILE_NAME, FileMode.OpenOrCreate);
BinaryWriter write = new BinaryWriter(fileStream);
book.saveDataTo(write);
write.Close();
fileStream = new FileStream(FILE_NAME, FileMode.Open, FileAccess.Read);
BinaryReader read = new BinaryReader(fileStream);
book.readDataFrom(read);
read.Close();
}
}
}
Publication.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
namespace Lab_7
{
class Publication
{
private float price;
private string publisherName, title;
public float Price
{
get
{
return price;
}
set
{
price = value;
}
}
public string PublisherName
{
get
{
return publisherName;
}
set
{
publisherName = value;
}
}
public string Title
{
get
{
return title;
}
set
{
title = value;
}
}
public void display()
{
Console.WriteLine("{0}\n{1}\n{2}", title, publisherName, price);
}
}
}
Book.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
namespace Lab_7
{
class Book : Publication
{
private string authorFirstName, authorLastName;
public string AuthorFirstName
{
get
{
return authorFirstName;
}
set
{
authorFirstName = value;
}
}
public string AuthorLastName
{
get
{
return authorLastName;
}
set
{
authorLastName = value;
}
}
public new void display()
{
}
public string getAuthorName()
{
return authorFirstName + " " + authorLastName;
}
public void readDataFrom(BinaryReader r)
{
Price = r.ReadInt32();
PublisherName = r.ReadString();
Title = r.ReadString();
authorFirstName = r.ReadString();
authorLastName = r.ReadString();
}
public void saveDataTo(BinaryWriter w)
{
w.Write(base.Price);
w.Write(base.PublisherName);
w.Write(base.Title);
w.Write(AuthorFirstName);
w.Write(AuthorLastName);
}
}
}
Regards.
HelpNeeder.
