文件流读写、大文件移动 FileStream StreamWriter

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace _09文件流
{
    class Program
    {
        static void Main(string[] args)
        {

            //string msg = "飞流直下三千尺";
            ////字符串转字节数组
            //byte[] buffer = System.Text.Encoding.UTF8.GetBytes(msg);


            ////字节数组转字符串

            //string str= System.Text.Encoding.UTF8.GetString(buffer);


            //把字符串写入到文件中,以流的方式写内容

            //using ( FileStream fs = new FileStream("1.txt", FileMode.Create, FileAccess.Write))
            //{
            //    string msg = "文能提笔控萝莉";
            //    byte[] buffer = System.Text.Encoding.UTF8.GetBytes(msg);
            //    fs.Write(buffer, 0, buffer.Length);

            //}//Console.ReadKey();


            //fs.Close();//关闭流
            //fs.Flush();//清除缓冲区
            //fs.Dispose();//释放占用的资源 （这三个必须一起写，用using方式就不用这三个释放资源了）


            //以流的方式读数据

            using (FileStream fs = new FileStream("1.txt", FileMode.Open, FileAccess.Read))
            {
                byte[] buffer = new byte[fs.Length];
                fs.Read(buffer, 0, buffer.Length);
                string msg = System.Text.Encoding.UTF8.GetString(buffer);
                Console.WriteLine(msg);
            }
            Console.ReadKey();


        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
namespace _10大文件移动
{
    class Program
    {
        static void Main(string[] args)
        {
            //读的流
            using (FileStream fsRead=new FileStream(@"G:\视频\海盗.mkv",FileMode.Open, FileAccess.Read))
            {
                //写的流
                using (FileStream fsWrite=new FileStream(@"G:\电影\海盗.mkv", FileMode.Create, FileAccess.Write))
                {
                    //每次读取的大小是5M
                    byte[]buffer=new byte[1024*1024*5];
                    //实际(真正读取到的大小)
                   int r= fsRead.Read(buffer, 0, buffer.Length);
                   while (r>0)
                   {
                       //写入
                       fsWrite.Write(buffer, 0, r);
                       Console.WriteLine("**");
                       //再读取
                       r = fsRead.Read(buffer, 0, buffer.Length);
                   }
                }
            }
            Console.WriteLine("ok了");
            Console.ReadKey();
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
namespace _11另一种方式的读和写
{
    class Program
    {
        static void Main(string[] args)
        {


            #region 读取数据
            //using (StreamReader reader = new StreamReader("1.txt",Encoding.Default))
            //{
            //只读取了一行

            //string msg= reader.ReadLine();
            //string msg;
            //要循环读取
            //while ((msg=reader.ReadLine())!=null)
            //{
            //    Console.WriteLine(msg);
            //}
            //一直读取到流的末尾
            //  string msg= reader.ReadToEnd();
            // Console.WriteLine(msg);
            //while (!reader.EndOfStream)
            //{
            //    Console.WriteLine(reader.ReadLine());
            //}

            // } 
            #endregion
            #region 写入数据

            //using (StreamWriter write=new StreamWriter("one.txt"))
            //{
            //    write.Write("原来这也可以啊");
            //}

            #endregion
           // Console.ReadKey();
           
        }
    }
}