Process[] pro = Process.GetProcesses();

            Process.Start("notepad");            Process.Start("mspaint");            Process.Start("iexplore", "http://baidu.com");            Process.Start("calc");            Console.ReadKey();

            //封装我们要打开的文件的相关信息，但并不打开            ProcessStartInfo psi = new ProcessStartInfo(@"C:\Users\andu\Desktop\a.txt");            Process pro = new Process();            //告诉进行去打开            pro.StartInfo = psi;            //这里的start(),是实例函数，非静态函数            pro.Start();

using System;using System.Collections.Generic;using System.Diagnostics;using System.IO;using System.Linq;using System.Text;using System.Threading.Tasks;namespace _01进程{    class Program    {        static void Main(string[] args)        {            //Process[] pro = Process.GetProcesses();            //foreach (var item in pro)            //{            //    item.Kill();            //    Console.WriteLine(item.ProcessName);            //}            //Process.Start("notepad");            //Process.Start("mspaint");            //Process.Start("iexplore", "http://baidu.com");            //Process.Start("calc");            ////封装我们要打开的文件的相关信息，但并不打开            //ProcessStartInfo psi = new ProcessStartInfo(@"C:\Users\andu\Desktop\a.txt");            //Process pro = new Process();            ////告诉进行去打开            //pro.StartInfo = psi;            ////这里的start(),是实例函数，非静态函数            //pro.Start();            Console.WriteLine("请输入打开文件路径");            string filePath = Console.ReadLine();            Console.WriteLine("请输入文件名");            string fileName = Console.ReadLine();            //通过简单工厂设计模式返回父类            BaseFile bf = GetFile(filePath, fileName);            if (bf!=null)            {                bf.OpenFile();            }            Console.ReadKey();        }        static BaseFile GetFile(string filePath,string fileName)        {            BaseFile bf = null;            string strExtension = Path.GetExtension(fileName); // 3.txt            switch (strExtension)            {                case ".txt":bf = new TxtFile(filePath, fileName);                    break;                case ".avi":bf= new AviFile(filePath, fileName);                    break;                case ".mp4":bf = new Mp4File(filePath, fileName);                    break;                default:                    break;            }            return bf;        }    }    class BaseFile    {        //字段、属性、构造函数、函数、索引器        private string _filePath; //封装属性快捷键 ctrl+r+e        public string FilePath        {            get            {                return _filePath;            }            set            {                _filePath = value;            }        }        //自动属性 快捷键 prop + 两下 tab        //属性的本质：两个函数，get和set        public string FileName { get; set; }        public BaseFile(string filePath,string fileName)        {            this.FilePath = filePath;            this.FileName = fileName;        }        //设计一个函数，打开指定文件        public void OpenFile()        {            ProcessStartInfo psi = new ProcessStartInfo(this.FilePath + "\\" + this.FileName);            Process pro = new Process();            pro.StartInfo = psi;            pro.Start();        }    }    class TxtFile : BaseFile    {        //子类默认调用父类无参构造函数，父类有参构造函数替换了无参的构造函数        public TxtFile(string filePath,string fileName) : base(filePath, fileName)        {        }    }    class Mp4File : BaseFile    {        public Mp4File(string filePath,string fileName) : base(filePath, fileName) { }    }    class AviFile :BaseFile    {        public AviFile(string filePath,string fileName) : base(filePath, fileName) { }    }}