C# 常用文件操作 文本文件 二进制文件 读写操作

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.IO;namespace text{    class Program    {        static void Main(string[] args)        {            FileStream fs = new FileStream("test.txt", FileMode.OpenOrCreate);            BinaryWriter bw = new BinaryWriter(fs);            bw.Write(1);            bw.Write(2);            bw.Write(3);            bw.Close();            fs.Close();            Console.ReadKey();            Console.WriteLine();            FileStream fs2 = new FileStream("test.txt", FileMode.Open);            BinaryReader br = new BinaryReader(fs2);            int a = br.ReadInt32();            int b = br.ReadInt32();            int c = br.ReadInt32();            Console.WriteLine(a);            Console.WriteLine(b);            Console.WriteLine(c);            br.Close();            fs2.Close();            Console.ReadKey();            FileStream fs3 = new FileStream("test2.txt", FileMode.Create);            StreamWriter sw = new StreamWriter(fs3);            sw.WriteLine("test from watkins");            sw.WriteLine("235");            sw.WriteLine(5);            sw.WriteLine("hah");            sw.Close();            fs3.Close();            Console.ReadKey();            Console.WriteLine();            FileStream fs4 = new FileStream("test2.txt", FileMode.Open);            StreamReader sr = new StreamReader(fs4);            string s1 = sr.ReadLine();            string s2 = sr.ReadLine();            string s3 = sr.ReadLine();            string s4 = sr.ReadLine();            Console.WriteLine(s1);            Console.WriteLine(s2);            Console.WriteLine(s3);            Console.WriteLine(s4);            Console.ReadKey();        }    }}