Delegates by Example Part 2

3/27/2017

using System;
/* This example illustrates building one delegate to call several functions in sequence
 * The final output of this example will be
 *
 * WriteOut method called
 * 2
 * WriteIn method called
 * 1
 * WriteIn method called
 * 0
 *
 * Notice that even though we pass 1 to the arguments of the delegate, the first iteration of
 * WriteIn recieves the value of 2. This is because WriteOut modified that value to 2.
 * Using this method, all functions share the same argument, thus if the first function modifies
 * it's value, it's modified for all the rest of the functions in the list.
 * This is very important in deciding whether to use the method in example1 or example2, as it
 * can significantly change the resulting output of the program.
 * (NOTE: This is not true on every compiler, test to find out)
 */
namespace DelegatesTutorial
{
    class Example2
    {
        // Declare the delegate to be used later, this sets the return type and expected parameters
        // for the delegate. All functions to be included must have the same return type and parameter list.
        delegate void MyDelegate(int number);
        public Example2()
        {
            // We'll create a single delegate from MyDelegate and assign WriteOut to it
            MyDelegate TheDelegate = new MyDelegate(WriteOut);
            // Now add WriteIn to the existing delegate
            TheDelegate += new MyDelegate(WriteIn);
            // Call the functions of the delegate
            TheDelegate(1);
            // Remove the WriteOut delegate
            TheDelegate -= new MyDelegate(WriteOut);
            // Call the functions of the delegate again.
            TheDelegate(1);
        }
        // These are the functions to be called by the delegate
        void WriteOut(int number)
        {
            Console.WriteLine("WriteOut method called");
            int i = ++number;
            Console.WriteLine(i.ToString());
        }
        void WriteIn(int number)
        {
            Console.WriteLine("WriteIn method called");
            int i = --number;
            Console.WriteLine(i.ToString());
        }
    }
}

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