public static void Main(string[] args)
{
var books = new BookRepository().GetBooks();
var enumerableList = books.ToList();
// LINQ Query Operators
var cheaperBooks = from b in enumerableList where b.Price < 10 orderby b.Title select b.Title;
foreach (var selectedBook in cheaperBooks)
{
Console.WriteLine(selectedBook);
}
Console.WriteLine("-----------");
// LINQ Extension Methods
var selectedBooks = enumerableList.Where(b => b.Price < 10).OrderBy(b => b.Title).Select(b => b.Title);
foreach (var selectedBook in selectedBooks)
{
Console.WriteLine(selectedBook);
}
// Get a single object (will throw exception if more than one element is found)
var book = enumerableList.SingleOrDefault(b => b.Price <= 4); // if finded, return true, else return false
Console.WriteLine("Find a book with its price lower than or equal to 4: {0}",
book != null ? book.Title : "null");
// Get the first object
var expensiveBook = enumerableList.FirstOrDefault(b => b.Price > 7);
// Similar: enumerableList.LastOrDefault
Console.WriteLine("Find the first book with its price higher than 7: {0}", expensiveBook?.Title);
}
