To introduce you to LINQ, we will first look into a non-LINQ example so that we can have a point of comparison.
We are going to implement a simple scenario: given a deck of 52 cards, we want to pick a random number of cards, and then take out all of the hearts. From this stack of hearts, we will discard the first two and take the next five cards (if possible), and order them by their face value for display.
You can try it in a C# program query in LINQPad:
public static Random random = new Random();
void Main()
{
var deck = CreateDeck();
var randomCount = random.Next(52);
var hearts = new Card[randomCount];
var j = 0;
// take all hearts out
for(var i=0;i<randomCount;i++)
{
if(deck[i].Suit == "Hearts")
{
hearts[j++] = deck[i];
}
}
// resize the array to avoid null references
Array.Resize(ref hearts, j);
// check that we have at least 2 cards. If not, stop
if(hearts.Length <= 2)
return;
var count = 0;
...