Project design
Design the skeleton of the intermediate final mini app.
Project: Library application
In this project you will build a library application step by step. Each lesson adds one piece and the previous lesson's solution comes as the starting point. At the end OOP, LINQ and serialization combine into a working console app.
The first lesson defines a Book class with Title and Author properties. Later lessons build on it: a Library, LINQ queries and file saving.
The Book class skeleton
A Book class carries two auto-properties: public string Title { get; set; } and public string Author { get; set; }. This is the simplest form of holding data inside a class.
You create an instance with new Book { Title = "Crime and Punishment", Author = "Dostoevsky" }. The object initializer assigns values to properties; no constructor is needed.
Exercise Define the Book class
Define a Book class with Title and Author string properties. In Main create a Book instance and print its title with Console.WriteLine.
Show example solution
Write class Book { public string Title { get; set; } public string Author { get; set; } }. In Main write var b = new Book { Title = "Crime and Punishment", Author = "Dostoevsky" }; Console.WriteLine(b.Title);
Example solution:
using System;
class Book
{
public string Title { get; set; }
public string Author { get; set; }
}
class Program
{
static void Main()
{
var b = new Book { Title = "Crime and Punishment", Author = "Dostoevsky" };
Console.WriteLine(b.Title);
}
}Test yourself
-
What does a class define?
- Data and behavior
- Only variables
- Only methods
- Only comments
Show answer
Data and behavior — Correct. A class holds both data (properties) and behavior (methods).
-
Complete the property
public string Title {____; }Show answer
public string Title {get; } -
Match the part to its role
- class
- Type definition
- public
- Access modifier
- string
- Text type
- new
- Create instance