工厂方法

工厂方法
特点：
将对象的创建放在工厂类中，利用抽象原理，将实例化行为延迟到工厂类中

using System;
using System.Collections.Generic;
using System.Text;

namespace OOAD_FactoryMethod
{
    class Program
    {
        static void Main(string[] args)
        {
            AbsFactory af = new DbFactory();
            AbsLog al = af.CreateLog();
            Console.WriteLine("日志内容" + al.getLog()[0].Message + "记录时间" + al.getLog()[0].RecordTime);

            AbsFactory af2 = new TxtFactor();
            AbsLog al2 = af2.CreateLog();
            Console.WriteLine("日志内容" + al2.getLog()[0].Message + "记录时间" + al2.getLog()[0].RecordTime);

            Console.Read();
        }
    }

    public class Log
    {
        /// <summary>
        /// 构造方法
        /// </summary>
        /// <param name="msg">日志内容</param>
        /// <param name="rt">日志记录时间</param>
        public Log(string msg, DateTime rt)
        {
            this.Message = msg;
            this.RecordTime = rt;
        }

        /// <summary>
        /// 日志内容
        /// </summary>
        private string _message;
        public string Message
        {
            get { return _message; }
            set { _message = value; }
        }

        /// <summary>
        /// 日志记录时间
        /// </summary>
        private DateTime _recordTime;
        public DateTime RecordTime
        {
            get { return _recordTime; }
            set { _recordTime = value; }
        }
    }

    public abstract class AbsLog
    {
        public abstract List<Log> getLog();
        public abstract bool InsertLog(Log log);
    }

    public class DbLog : AbsLog
    {
        public override List<Log> getLog()
        {
            List<Log> list = new List<Log>();
            list.Add(new Log("DB", DateTime.Now));
            return list;
        }
        public override bool InsertLog(Log log)
        {
            return true;
        }
    }

    public class TxtLog : AbsLog
    {
        public override List<Log> getLog()
        {
            List<Log> list = new List<Log>();
            list.Add(new Log("Txt", DateTime.Now));
            return list;
        }
        public override bool InsertLog(Log log)
        {
            return true;
        }
    }

    public abstract class AbsFactory
    {
        public abstract AbsLog CreateLog();
    }

    public class TxtFactor : AbsFactory
    {
        public override AbsLog CreateLog()
        {
            return new TxtLog();
        }
    }

    public class DbFactory : AbsFactory
    {
        public override AbsLog CreateLog()
        {
            return new DbLog();
        }
    }

}