Delegate-Examples => Methods: named + anonymous + lambda-expression

delegate_examples.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;



namespace SandboxConsole
{
    // Declare delegate -- defines required signature:
    delegate double DTaschenrechner(double zahl);



    class Program
    {
        // Define: Regular method that matches the signature of the delegate:
        static double MalZwei(double input)
        {
            return (input * 2);
        }

    
        static void Main(string[] args)
        {
            // Instantiate delegate with named method:
            DTaschenrechner rechner = MalZwei;
            Console.WriteLine( rechner(5) ); // Ausgabe: 10

            // Instantiate delegate with anonymous method:
            DTaschenrechner rechner2 = delegate(double input)
            {
                return (input * 2);
            };
            Console.WriteLine( rechner2(5) ); // Ausgabe: 10

            // Instatiate delegate with lambda expression
            DTaschenrechner rechner3 = s => s * 2;
            double zahl = rechner3(5);
            Console.WriteLine(zahl); // Ausgabe: 10

            Console.ReadKey();
        }

        
    }



}