static void Generics()
{
// var book = new Book { Isbn = "1111", Title = "C# Advanced" };
// Without Generics we need to do in this way
// var numbers = new List();
// numbers.Add(0);
// var books = new BookList();
// books.Add(book);
// With Generics we eliminate the code duplication
// We could avoid code duplication (List and BookList) using and ObjectList
// However, we will have to handle with performance problems because of boxing and unboxing
// So, forget about these options and always use Generics
// var numbers = new GenericList<int>();
// numbers.Add(10);
// var books = new GenericList<Book>();
// books.Add(new Book());
// var dictionary = new GenericDictionary<string, Book>();
// dictionary.Add("1234", new Book());
// var utilities = new Utilities();
// Console.WriteLine(utilities.Max(11, 22));
// Console.WriteLine(utilities.MaxGeneric<int>(11, 22));
var number = new Generics.Nullable <int>(5);
Console.WriteLine($"Has Value ? {number.HasValue}");
Console.WriteLine($"Value: {number.getValueOrDefault()}");
var number2 = new Generics.Nullable <int>();
Console.WriteLine($"Has Value ? {number2.HasValue}");
Console.WriteLine($"Value: {number2.getValueOrDefault()}");
}
public static void UseNullableT()
{
var number = new Generics.Nullable <int>(5);
Console.WriteLine($"Has Value ? {number.HasValue}");
Console.WriteLine($"Value: {number.GetValueOrDefault()}");
//nullable int
var anotherNumber = new Generics.Nullable <int>();
Console.WriteLine($"Has Value ? {anotherNumber.HasValue}");
Console.WriteLine($"Value: {anotherNumber.GetValueOrDefault()}");
}
static void Main(string[] args)
{
var book = new Book
{
Id = 1,
Name = "FixItNooo"
};
var books = new GenericList <Book>();
books.Add(book);
var dictionary = new GenericDictionary <string, Book>();
dictionary.Add("test", book);
var number = new Generics.Nullable <int>();
Console.WriteLine("Has Value?" + number.HasValue);
Console.WriteLine("Value" + number.GetValueOrDefault());
Console.WriteLine("Hello World!");
}
