C#编程-110：文件操作File静态类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
namespace IOTest
{
    class Program
    {
        static void Main(string[] args)
        {
            //判断文件是否存在
            //file是静态类
            string path = @"C:\Users\pengshiyu\Desktop\新建文本文档.txt";
            if (File.Exists(path)) Console.WriteLine("file \""+path+"\" is exists");
            else Console.WriteLine("file \""+path+"\" is not exists");
            //创建文件,注意：需要把创建的文件流关闭
            //方法一：try catch语句
            //方法二：先判断不存在，再创建
            string path1 = @"C:\Users\pengshiyu\Desktop\";
            if (!File.Exists(path1 + "newFile.txt"))
            {
                FileStream filestream = File.Create(path1 + "newFile.txt");
                filestream.Close();
                Console.WriteLine("文件创建成功！");
            }
            else
                Console.WriteLine("文件已经存在！");
            //打开文件
            //FileMode有六种枚举
            string path2 = @"C:\Users\pengshiyu\Desktop\test.txt";
            try
            {
                FileStream filestream = File.Open(path2,FileMode.Truncate);
                byte[] writebyte = { (byte)'p', (byte)'s', (byte)'y', (byte)',', (byte)'t', (byte)'e', (byte)'s', (byte)'t' };
                filestream.Write(writebyte,0,writebyte.Length);
                filestream.Close();
                Console.WriteLine("文件写入成功！");
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            //文件复制
            string pathSource = @"C:\Users\pengshiyu\Desktop\source\test.txt";
            string pathDestination = @"C:\Users\pengshiyu\Desktop\destination\test.txt";
            if (File.Exists(pathSource))
            {
                try
                {
                    if (!File.Exists(pathDestination))
                    {
                        Console.WriteLine("请选择复制（1）还是移动（2）：");
                        string choice = Console.ReadLine();
                        if (choice == "1")
                        {
                            //文件复制
                            File.Copy(pathSource, pathDestination, false);
                            Console.WriteLine("文件拷贝成功！");
                            Console.WriteLine("是否删除源文件？删除：1，不删除：2");
                            string delChoice = Console.ReadLine();
                            if (delChoice == "1")
                            {
                                //文件删除
                                File.Delete(pathSource);
                                Console.WriteLine("源文件删除成功！");
                            }
                            else if (delChoice == "2")
                            {
                                Console.WriteLine("不删除！");
                            }
                            else
                            {
                                Console.WriteLine("用户输入有误！");
                            }
                       }
                        else if (choice == "2")
                        {
                            //文件移动
                            File.Move(pathSource, pathDestination);
                            Console.WriteLine("文件移动成功!");
                        }
                        else
                        {
                            Console.WriteLine("文件存在，是否覆盖？是：1，否：2");
                            string choicecover = Console.ReadLine();
                            if (choicecover == "1")
                            {
                                File.Copy(pathSource, pathDestination, true);
                                Console.WriteLine("文件拷贝成功，覆盖完成！");
                            }
                            else if (choicecover == "2")
                            {
                                Console.WriteLine("文件拷贝失败，文件已存在！");
                            }
                            else
                            {
                                Console.WriteLine("输入有误！");
                            }
                        }
                    }
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.Message);
                }
            }
            else
            {
                Console.WriteLine("源文件不存在");
            }
            Console.ReadKey();
        }
    }
}