Added a basic practice

Author: buraksenyurt

Learning.Delegates/BasicSample.cs

@@ -1,5 +1,21 @@
 namespace Learning.Delegates;
 
-internal class BasicSample
+delegate int MathOperation(int a, int b);
+
+class BasicSample
 {
+    public static void Run()
+    {
+        MathOperation addition = (a, b) => a + b;
+        // static int addition(int a, int b) => a + b; // Local Function kullanımı
+        MathOperation subtraction = (a, b) => a - b;
+
+        int x = 5;
+        int y = 9;
+
+        MathOperation operation = addition;
+        Console.WriteLine($"Result: {operation(x, y)}");
+        MathOperation operation1 = subtraction;
+        Console.WriteLine($"Result: {operation(x, y)}");
+    }
 }

Learning.Delegates/EventSample.cs

@@ -1,5 +1,33 @@
 namespace Learning.Delegates;
 
-internal class EventSample
+delegate void OrderProcessedHandler(string orderId);
+
+class OrderProcessor
 {
+    public event OrderProcessedHandler OrderProcessed;
+
+    public void ProcessOrder(string orderId)
+    {
+        Console.WriteLine($"Order {orderId} is being processed...");
+        System.Threading.Thread.Sleep(1000);
+        Console.WriteLine($"Order {orderId} processed!");
+
+        OrderProcessed?.Invoke(orderId);
+    }
+}
+
+class EventSample
+{
+    public static void Run()
+    {
+        var processor = new OrderProcessor();
+
+        processor.OrderProcessed += orderId => Console.WriteLine($"Email sent for order {orderId}");
+        processor.OrderProcessed += orderId => Console.WriteLine($"Data Warehouse notified for order {orderId}");
+
+        Console.WriteLine("Enter order ID:");
+        string orderId = Console.ReadLine();
+
+        processor.ProcessOrder(orderId);
+    }
 }

Learning.Delegates/MulticastSample.cs

@@ -1,5 +1,50 @@
 namespace Learning.Delegates;
 
-internal class MulticastSample
+/*
+    Multicast Delegate; Bir delegate ile birden fazla metodu zincir olarak bağlayıp kullanmamız mümkündür. 
+    Tek bir delegate çağrısı kendisine += operatörü ile eklenmiş tüm metotların çağırılması anlamına gelir
+    
+    Event; Delegate tipleri ile event'lerin tetiklenmesi de mümkündür.
+*/
+
+delegate void LogHandler(string message);
+
+static class MulticastSample
 {
+    public static void Run()
+    {
+        #region Multicast Delegate Kullanımı
+
+        // Aşağıdaki satırda handlers isimli değişkene LogToConsole metodunu atadık
+        LogHandler handlers = LogToConsole;
+        handlers += LogToTextFile; // handlers değişkenine ikinci bir metot daha ekledik
+        handlers += LogToDatabase;
+        Log(handlers, "API gateway online");
+
+        //handlers("Connection succedded..."); // Hem Console, hem text hem de db loglama fonksiyonları arka arkaya çağrılır
+
+        // handlers -= LogToTextFile;
+
+        //handlers("Loading games...");
+
+        #endregion
+    }
+    static void Log(LogHandler handler, string message)
+    {
+        handler(message);
+    }
+
+    static void LogToConsole(string message)
+    {
+        Console.WriteLine($"{DateTime.Now}: {message}");
+    }
+    static void LogToTextFile(string message)
+    {
+        var logText = $"\n{DateTime.Now}: {message}";
+        File.AppendAllText(Path.Combine(Environment.CurrentDirectory, "logs.txt"), logText);
+    }
+    static void LogToDatabase(string message)
+    {
+        Console.WriteLine("Writing to db");
+    }
 }

Learning.Delegates/Program.cs

@@ -12,6 +12,8 @@ internal class Program
 {
     static void Main(string[] args)
     {
-        
+        BasicSample.Run();
+        MulticastSample.Run();
+        EventSample.Run();
     }
 }