static void Main(string[] args)
{
Console.WriteLine("--LA01--");
Metodusok met = new Metodusok(M1);
met += M2;
met(10, 5);
met -= M2;
met -= M1;
if (met != null)
{
met(10, 5);
}
met?.Invoke(10, 5);
// ############################################################
met += delegate(int a, int b)
{
System.Console.WriteLine(a * b);
return(a * b);
};
met(10, 10);
// ############################################################
Random r = new Random();
List <int> lista = new List <int>();
for (int i = 0; i < 10; i++)
{
lista.Add(r.Next(100));
}
Console.WriteLine("ELEMEK");
foreach (var item in lista)
{
Console.WriteLine(">>" + item);
}
// delegate
int p1 = lista.Find(ParosE);
System.Console.WriteLine(p1);
// lambda
int p2 = lista.Find(x => x % 2 == 0);
System.Console.WriteLine(p2);
// ############################################################
/*
*
* > Action is a delegate (pointer) to a method, that takes zero, one or more input parameters, but does not return anything.
*
* > Func is a delegate (pointer) to a method, that takes zero, one or more input parameters, and returns a value (or reference).
*
* > Predicate is a special kind of Func often used for comparisons.
*
* src: https://stackoverflow.com/questions/4317479/func-vs-action-vs-predicate
*
* Érdemes a docs.microsoft.com-on is nézelődni!
*
*/
Action <string> udvozlo = (x => Console.WriteLine(">>>" + x));
udvozlo += (x => Console.WriteLine(":::" + x));
udvozlo += (x => Console.WriteLine("==>" + x));
udvozlo += (x => Console.WriteLine("~~~" + x));
udvozlo?.Invoke("John Wick");
// ------------
// https://docs.microsoft.com/en-us/dotnet/api/system.func-2?view=netcore-3.1
Func <string, int> converter = x => int.Parse(x);
int a = converter("333");
int aa = converter("654");
System.Console.WriteLine(a);
System.Console.WriteLine(aa);
Func <int, int, int> adder = (x, y) => x + y;
int aaa = adder(10, 11);
System.Console.WriteLine(aaa);
// --------
Predicate <int> eldontes = ParosE;
Console.WriteLine(eldontes(10));
Console.WriteLine(eldontes(11));
// ############################################################
Ember[] emberek = new Ember[]
{
new Ember()
{
Nev = "András", Eletkor = 20
},
new Ember()
{
Nev = "Klaudia", Eletkor = 35
},
new Ember()
{
Nev = "Barbara", Eletkor = 75
},
new Ember()
{
Nev = "János", Eletkor = 12
}
};
foreach (var item in emberek)
{
Console.WriteLine("> " + item);
}
Array.Sort(emberek, EmberOsszehasonlito);
foreach (var item in emberek)
{
Console.WriteLine("==> " + item);
}
}
static int EmberOsszehasonlito(Ember x, Ember y)
{
return(x.CompareTo(y));
}