Code is compiled and run successfully but expected output is to print "Sub" is not getting printed. What is the error in this code?

Question

What is the problem in this code?

namespace ConsoleApplication1
{
public delegate void del();

class Program
{
    static void Main(string[] args)
    {
        del d = new del(add);
        d += sub;
    }

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

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

Youre never invoking the delegate – Neijwiert Feb 28 '18 at 13:02 — Neijwiert, Feb 28 '18 at 13:02
expected output is `add` and `Sub` – vc 74 Feb 28 '18 at 13:06 — vc 74, Feb 28 '18 at 13:06

score 2 · Accepted Answer · answered Feb 28 '18 at 13:12

You need to invoke your delegate:

class Program
{
    static void Main(string[] args)
    {
        del d = new del(add);
        d += sub;

        d.Invoke();
    }

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

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

Code is compiled and run successfully but expected output is to print "Sub" is not getting printed. What is the error in this code?

1 Answers1