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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