using System;

public delegate void DelegateClass(out int var);

public class Starter {

    public static void Main() {

        DelegateClass del = MethodA();
        int var;
        del(out var);
        del(out var);
        del(out var);
        Console.WriteLine(var);
    }

    public static DelegateClass MethodA() {
        int increment = 0;
        return delegate(out int var) {
            var = ++increment;
        };
    }
}

    

   
 

using System;
class Publisher {
    public event EventHandler MyEvent;
}

public class Subscriber {

    public static void Handler(object obj, EventArgs args) {
    }

    public static void Main() {
        Publisher pub = new Publisher();
        pub.MyEvent += Handler;
        // other processing
    }
}

    

   
 

using System;

public delegate void DelegateClass();

public class Starter {
    public static void Main() {
        DelegateClass del = (DelegateClass)
        DelegateClass.Combine(new DelegateClass[] { MethodA, MethodB, MethodA, MethodB });
        del();
        foreach (DelegateClass item in
            del.GetInvocationList()) {
            Console.WriteLine(item.Method.Name + " in invocation list.");
        }
    }
    public static void MethodA() {
        Console.WriteLine("MethodA...");
    }

    public static void MethodB() {
        Console.WriteLine("MethodB...");
    }
}

    

   
 

using System;

public delegate void DelegateClass();

public class Starter {
    public static void Main(){
         DelegateClass del=MethodA;
         del+=MethodB;
         del+=MethodC;
         del=del-MethodB;
         del();
     }
    public static void MethodA() {
        Console.WriteLine("MethodA...");
    }

    public static void MethodB() {
        Console.WriteLine("MethodB...");
    }

    public static void MethodC() {
        Console.WriteLine("MethodC...");
    }
}

    

   
 

using System;

public delegate void Task();

public class Starter {
    public static void Main() {
        Task[] tasks = { MethodA, MethodB, MethodC };
        string resp;
        tasks[0]();
        tasks[1]();
        tasks[2]();
    }

    public static void MethodA() {
        Console.WriteLine("Doing TaskA");
    }

    public static void MethodB() {
        Console.WriteLine("Doing TaskB");
    }

    public static void MethodC() {
        Console.WriteLine("Doing TaskC");
    }
}

    

   


using System;

public class DelegatesMulticasting
{
    delegate void ProcessHandler(string message);
    
    static public void Process(string message)
    {
        Console.WriteLine("Test.Process("{0}")", message);
    }
    public static void Main()
    {
        User user = new User("George");
        
        ProcessHandler ph = new ProcessHandler(user.Process);
        ph = (ProcessHandler) Delegate.Combine(ph, new ProcessHandler(Process));
        
        ph("Wake Up!");        
    }
}
public class User
{
    string name;
    public User(string name)
    {
        this.name = name;
    }    
    public void Process(string message)
    {
        Console.WriteLine("{0}: {1}", name, message);
    }
}



           
          

   


using System;

public class DelegatestoInstanceMembers
{
    delegate void ProcessHandler(string message);
    
    public static void Main()
    {
        User aUser = new User("George");
        ProcessHandler ph = new ProcessHandler(aUser.Process);
        
        ph("Wake Up!");        
    }
}

public class User
{
    string name;
    public User(string name)
    {
        this.name = name;
    }    
    public void Process(string message)
    {
        Console.WriteLine("{0}: {1}", name, message);
    }
}