Factory Pattern with example – Exception logger

The intent of Factory Mehod is Define an interface for creating an object, but let subclasses decide which class to instantiate. Factory Method lets a class defer instantiation to subclasses.

Create ExceptionFactory.cs class file and add below code.

using System;
namespace dotnetfundamentals.AbstractFactory
{
    //Creating the Abstract Logger
    public interface ILog
    {
        void Log();
    }
    public class FileLogger : ILog
    {
        public void Log()
        {
            Console.Write("Log to File");
        }
    }
    public class DBLogger : ILog
    {
        public void Log()
        {
            Console.Write("Log to DB");
        }
    }
    //Creating the Concrete Factories
    public class LogTypeChecker
    {
        static public ILog WriteLog(LogType logType)
        {
            ILog objLog = null;
            if(logType ==  LogType.File)
            {
                objLog = new FileLogger();
            }
            else if (logType == LogType.Database)
            {
                objLog = new DBLogger();
            }
            return objLog;
        }
    }
    public enum LogType
    {
        File,
        Database
    }
}

Add below code in Program.cs file.

using System;
namespace dotnetfundamentals.AbstractFactory
{
    class Program
    {
        static void Main(string[] args)
        {
            ILog objLogger = LogTypeChecker.WriteLog(LogType.File);
            objLogger.Log();
        }
    }
}