The minimum implementation of a delegate

/*
C# Programming Tips & Techniques
by Charles Wright, Kris Jamsa

Publisher: Osborne/McGraw-Hill (December 28, 2001)
ISBN: 0072193794
*/
//  Delegate.cs - Demonstrates the minimum implementation of a delegate
//                Compile this program with the following command line:
//                    C:>csc Delegate.cs
//
namespace nsDelegate
{
    using System;

    public class Delegate21
    {
//  Declare the delegate type
        public delegate double MathHandler (double val);
//  Declare the variable that will hold the delegate
        public MathHandler DoMath;

        static public void Main ()
        {
            double val = 31.2;
            double result;
            Delegate21 main = new Delegate21();
//  Create the first delegate
            main.DoMath = new Delegate21.MathHandler (main.Square);
//  Call the function through the delegate
            result = main.DoMath (val);
            Console.WriteLine ("The square of {0,0:F1} is {1,0:F3}",
                                val,  result);
//  Create the second delegate
            main.DoMath = new Delegate21.MathHandler (main.SquareRoot);
//  Call the function through the delegate
            result = main.DoMath (val);
            Console.WriteLine ("The square root of {0,0:F1} is {1,0:F3}",
                               val, result);
        }
        public double Square (double val)
        {
            return (val * val);
        }
        public double SquareRoot (double val)
        {
            return (Math.Sqrt (val));
        }
    }
}

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1.	Define your own delegate
2.	Late Binding Delegates: A delegate is a repository of type-safe function pointers.
3.	illustrates the use of a delegate 2
4.	illustrates the use of a multicast delegate
5.	illustrates the use of a delegate that calls object methods
6.	Demonstrates a simple form of a delegate
7.	Demonstrates combining and removing delegates to create new delegates
8.	Demonstrate getting and printing the invocation list for a delegate
9.	Demonstrates adding multiple methods to a delegate
10.	Using a delegate with a container class to sort the collection and return a sorted array using different sort criteria
11.	Demonstrate using a static delegate without declaring an instance of the class
12.	A simple delegate example
13.	Delegates can refer to instance methods, too
14.	Two delegates
15.	Delegates:Using Delegates
16.	Delegates to Instance Members
17.	Delegates:Multicasting
18.	Arrays of Delegates
19.	To remove delegates from a multicast delegate, use the Remove method, the minus operator (-), or the -= assignment operator.
20.	the syntax of the GetInvocationList method: delegate [] GetInvocationList()
21.	The publisher/subscriber relationship is a one-to-many relationship.
22.	Lifetime of outer variables is aligned with the delegate
23.	Combining delegates Multiple delegates are combined using the Combine method, the plus operator (+), or the += assignment operator.
24.	CreateDelegate and DynamicInvoke

The minimum implementation of a delegate : delegate « Language Basics « C# / C Sharp

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