Using delegates in Events. Basic Example

 

Using delegates. Basic Example

MULTICAST

ENCAPSULATION

class Program

    {

        static void Main(string[] args)

        {

            BookDb books = new BookDb();

            AddBooks(books);            

            Console.WriteLine("Soft cover book titles:");

            books.SearchSoftCoverBooks(PrintTitle);

            Total sum = new Total();

            books.SearchSoftCoverBooks(sum.CalculateTotalPrice);

            Console.WriteLine("Cumulative total price: {0}", sum.total.ToString());

            Console.ReadKey();

        }

        static void PrintTitle(Book book)

        {

            Console.WriteLine(" > {0}", book.title);

        }

        static void AddBooks(BookDb db)

        {

            db.AddBook("C programming", "Brian W.", 19.95m, true);

            db.AddBook("Unix 2.0", "William G.", 25.50m, true);

            db.AddBook("MS-DOS", "Smith E.", 12.75m, false);

            db.AddBook("Cleam code", "Nicholson A.", 22.50m, true);

        }

    }

    public class BookDb

    {

        ArrayList db = new ArrayList();

        public void AddBook(string title, string owner, decimal price, bool softCover)

        {

            db.Add(new Book(title, owner, price, softCover));

        }

        public void SearchSoftCoverBooks(SearchBooks searchBooks)

        {

            foreach(Book b in db)

            {

                if(b.softCover)

                {

                    searchBooks(b);

                }

            }

        }

    }

    public class Total

    {

        public decimal total;

        public void CalculateTotalPrice(Book book)

        {

            total += book.price;

        }

    }

    public delegate void SearchBooks(Book book);

    public class Book

    {

        public string title;

        public string owner;

        public decimal price;

        public bool softCover;

        public Book(string title, string owner, decimal price, bool softCover)

        {

            this.title = title;

            this.owner = owner;

            this.price = price;

            this.softCover = softCover;

        }

    }

Using Interfaces, Basic Examples

EJEMPLO 1

EJEMPLO 2

Installing your own Windows Service

PROGRAM.CS

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using Topshelf;  //ADD THIS PACKAGE

namespace MyService

{

    class Program

    {

        static void Main(string[] args)

        {

            var host = HostFactory.Run(front =>

            {

                front.RunAsLocalSystem();

                front.SetServiceName("FileUpload");

                front.SetDisplayName("File Update Service");

                front.SetDescription("Servicio local de File Update Service");

                front.Service<FileUpdate>(back => 

                {

                    back.ConstructUsing(service => new FileUpdate());

                    back.WhenStarted(service => service.Start());

                    back.WhenStopped(service => service.Stop());

                });

            });

            int outvalue = (int)Convert.ChangeType(host, host.GetTypeCode());

            Environment.ExitCode = outvalue;

        }

    }

}

/*INSTALL SERVICE

*

*   COPY CODE TO SOME FOLDER. EXAMPLE: C:\TMP\CODE\

*   RUN WINDOWS SHELL CONSOLE AS ADMINISTRATOR

*   C:> CD C:\TMP\CODE\

*   C:\TMP\CODE\> MYSERVICE.EXE INSTALL START

* 

* UNINSTALL SERVICE

* 

*   RUN WINDOWS SHELL CONSOLE AS ADMINISTRATOR

*   C:> CD C:\TMP\CODE\

*   C:\TMP\CODE\> MYSERVICE.EXE UNINSTALL 

*  

*/

====================================================
CLASS FILEUPLOAD

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

namespace MyService
{
    class FileUpdate
    {
        private readonly Timer time;

        public FileUpdate()
        {
            time = new Timer(1000)
            {
                AutoReset = true
            };
            time.Elapsed += Time_Elapsed;
        }

        private void Time_Elapsed(object sender, ElapsedEventArgs e)
        {
            string line = string.Format("{0}\n", DateTime.Now.ToString());
            File.AppendAllText(@"C:\tmp\timer.log", line);
        }

        public void Start()
        {
            time.Start();
        }

        public void Stop()
        {
            time.Stop();
        }
    }
}