NotificationLibrary.cs

using System;

namespace DB_Helper
{
    internal class NotificationLibrary
    {
        // Basis-Interface für Benachrichtigungen
        public interface INotification
        {
            void ShowMessage(string message);

            void ShowError(string error);

            void ShowWarning(string warning);
        }

        // Logger-Implementierung
        /*
        Logger verwenden
        var logger = new LogNotification("app.log");
        logger.ShowMessage("Operation erfolgreich");
        logger.ShowError("Ein Fehler ist aufgetreten");
        */

        public class LogNotification : INotification
        {
            private readonly string logPath;

            public LogNotification(string path = "log.txt")
            {
                logPath = path;
            }

            public void ShowMessage(string message)
            {
                LogToFile($"INFO: {message}");
            }

            public void ShowError(string error)
            {
                LogToFile($"ERROR: {error}");
            }

            public void ShowWarning(string warning)
            {
                LogToFile($"WARNING: {warning}");
            }

            private void LogToFile(string content)
            {
                try
                {
                    System.IO.File.AppendAllText(logPath, $"{DateTime.Now}: {content}\n");
                }
                catch (Exception ex)
                {
                    Console.WriteLine($"Logging failed: {ex.Message}");
                }
            }
        }

        // Event-basierte Implementierung
        /*
        Events verwenden
        var events = new EventNotification();
        events.OnError += (sender, message) =>
        {
        // Hier kann man auf Fehler reagieren
        };
        events.ShowError("Fehlermeldung");
        */

        public class EventNotification : INotification
        {
            public event EventHandler<string> OnMessage;

            public event EventHandler<string> OnError;

            public event EventHandler<string> OnWarning;

            public void ShowMessage(string message)
            {
                OnMessage?.Invoke(this, message);
            }

            public void ShowError(string error)
            {
                OnError?.Invoke(this, error);
            }

            public void ShowWarning(string warning)
            {
                OnWarning?.Invoke(this, warning);
            }
        }

        // Konsolen-basierte Implementierung
        /*

        Konsole verwenden
        var console = new ConsoleNotification();
        console.ShowWarning("Warnung!");
        */

        public class ConsoleNotification : INotification
        {
            public void ShowMessage(string message)
            {
                var originalColor = Console.ForegroundColor;
                Console.ForegroundColor = ConsoleColor.White;
                Console.WriteLine($"INFO: {message}");
                Console.ForegroundColor = originalColor;
            }

            public void ShowError(string error)
            {
                var originalColor = Console.ForegroundColor;
                Console.ForegroundColor = ConsoleColor.Red;
                Console.WriteLine($"ERROR: {error}");
                Console.ForegroundColor = originalColor;
            }

            public void ShowWarning(string warning)
            {
                var originalColor = Console.ForegroundColor;
                Console.ForegroundColor = ConsoleColor.Yellow;
                Console.WriteLine($"WARNING: {warning}");
                Console.ForegroundColor = originalColor;
            }
        }
    }
}