static void Main(string[] args)
{
var BookList = new BookCollection().GetBooks();
var cheapBooks = BookList.Where(b => b.Price < 10).OrderBy(bk => bk.Title);
foreach (var book in cheapBooks)
{
Console.WriteLine($"Book: {book.Title} -- Price: {book.Price}.");
}
// Linq-Query and Linq-Expression are same;
// Linq-Query:
/* var b0 = from b in BookList
* where b.Price < 10
* orderby b.Title
* select b.Title; */
// Linq-Expression:
/* var b1 = BookList.Where(b => b.Price < 10).OrderBy(bk => bk.Title).Select(b => b.Title); */
// last 3 in Linq Expression
dynamic Last3 = BookList.Skip(2).Take(3);
Console.WriteLine($"Take 1s to jump over 2 books...");
Thread.Sleep(1000);
foreach (var l3b in Last3)
{
Console.WriteLine($"Book: {l3b.Title} -- Price: {l3b.Price}.");
}
// common Linq-Expression
/* BookList.Add();
* BookList.AddRange();
* BookList.Aggregate();
* BookList.Find();
* BookList.FindIndex();
* BookList.FindLast();
* BookList.ElementAtOrDefault();
* BookList.First(); || BookList.FirstOrDefault();
* BookList.Last(); || BookList.LastOrDefault();
* BookList.Single(); || BookList.SingleOrDefault();
*
* BookList.Min(); || BookList.Max(); || BookList.Count(); || BookList.Sum(); ||BookList.Average();
*
* BookList.Skip().Take(); */
// Nullable now...
Nullable_Ops.ShowNullableDates();
DyanmicVariables.ShowDynamicVariables();
Exist exi = new Exist();
exi.ExistByEnter();
}
