C#简单工厂模式（文件案例）

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using System;using System.Collections.Generic;using System.IO;using System.Linq;using System.Text;using System.Threading.Tasks;namespace 读文件案例{    class Program    {        static void Main(string[] args)        {            Console.WriteLine("请输入文件名");            string fileName = Console.ReadLine();//获得用户输入            File file = Factory.GetFileName(fileName);            file.OpenFile();            Console.ReadKey();        }    }    /// <summary>    /// 父类，等待子类实现    /// </summary>    public abstract class File    {        private string _fileName;//文件名        public string FileName        {            get { return _fileName; }            set { _fileName = value; }        }        private string _extension;//后缀名        public string Extension        {            get { return _extension; }            set { _extension = value; }        }        /// <summary>        /// 构造函数        /// </summary>        /// <param name="fileName"></param>        public File(string fileName)        {            //在本类中，用私有字段即可，不必要使用属性来保护对应的字段            this._fileName = Path.GetFileNameWithoutExtension(fileName);            this._extension = Path.GetExtension(fileName);        }        public abstract void OpenFile();    }    public class TxtFile : File    {        /// <summary>        /// 子类构造函数，调用父类构造函数为字段赋值        /// </summary>        /// <param name="fileName"></param>        public TxtFile(string fileName)            : base(fileName)        { }        public override void OpenFile()        {            //此时就需要用属性来保护字段了            Console.WriteLine("文件名为{0}，后缀名为{1}", this.FileName, this.Extension);        }    }    public class AviFile : File    {        public AviFile(string fileName)            : base(fileName)        { }        public override void OpenFile()        {            Console.WriteLine("文件名为{0}，后缀名为{1}", this.FileName, this.Extension);        }    }    public class Factory    {        public static File GetFileName(string fileName)        {            File file = null;            switch (Path.GetExtension(fileName).ToLower())            {                case "txt":                case ".txt": file = new TxtFile(fileName); break;                case "avi":                case ".avi": file = new AviFile(fileName); break;                //父类是虚方法的写法                //case "txt":                //case ".txt": return new TxtFile(fileName);                //default: return new File(fileName);            }            return file;        }    }}
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