操作文件流的类，读写类StreamReader,StreamWriter和File类以及Directory类的操作

FileStream类的控制

(1) Flush();  清除此流的缓冲区，是为了保护硬盘

static void Main(string[] args){            using (FileStream filewrite = new FileStream("file.txt", FileMode.Create, Fileaccess.Write))            {                filewrite.WriteByte(101);                filewrite.WriteByte(101);                //清除此流的缓冲区                filewrite.Flush();                filewrite.WriteByte(101);                filewrite.WriteByte(101);                //每次写一个直接就会频繁的操作硬盘，            }}

(2)Seek(偏移，位置枚举)

static void Main(string[] args){            using (FileStream fileRead = new FileStream("file.txt", FileMode.Open, FileAccess.Read))            {                fileRead.Position = 4;                fileRead.Seek(3, SeekOrigin.Current);                int n = fileRead.ReadByte();                Console.WriteLine((char)n);            }

其它流

(1)MemoryStream 内存流

            NetworkStream ns = new NetworkStream();

(2)NetworkStream 网络流

            MemoryStream ms = new MemoryStream();

读写流

(1) StreamReader

//读取文件流        static void Main(string[] args)        {            using(FileStream fileRead=new FileStream("成功.txt",FileMode.Open,FileAccess.Read))            {                using (StreamReader sr = new StreamReader(fileRead,Encoding.Default))                {                    //第一种读法                    //string str = sr.ReadLine();                    //while ((str = sr.ReadLine()) != null)                    //{                    //    Console.WriteLine(str);                    //}                    //第二种读法                    Console.WriteLine(sr.ReadToEnd());                }            }        }

(2)StreamWriter

            static void Main(string[] args)

        {

            using (StreamWriter sw = new StreamWriter("成功.txt"))

            {

                sw.WriteLine();

            }

        }

File

(1) File关于文件读取的方法

            1)使用File文件读取流

                   //损失性能

            byte[] bs=File.ReadAllBytes("file.txt");

            2)管理文件

                   ->创建文件

                          File.Create("f://韩迎龙.txt", 10 * 1024 * 1024);

                   ->删除文件

                          File.Delete("f://韩迎龙.txt");

                   ->查文件

                          bool isExist = File.Exists("f://韩迎龙.txt");

                          Console.WriteLine(isExist);

(2)FileInfo

            1)创建文件

FileInfo file = new FileInfo("f://韩迎龙.txt"); //在内存中存在

            file.Create();  //创建文件

            2)设置属性

                   file.Attributes = FileAttributes.ReadOnly; //在属性中查看

(3)Copy方法 复制

            File.Copy("f://韩迎龙.txt", "f://111.txt");

(4)Move方法 移动

            File.Move("f://韩迎龙.txt", "f://1//韩迎龙.txt");

(5)修改文件的全部名称

static void Main(string[] args)        {            string[] fnames = Directory.GetFiles("f://1");            //Array的Sort方法可以对数组进行排序            Array.Sort(fnames);            for (int i = 0; i < fnames.Length; i++)            {                string temp = fnames[i];                //获得文件名                string fileName = Path.GetFileName(temp);                //获得路径名                string path = Path.GetDirectoryName(temp);                //新的文件名                string newPath = Path.Combine(path, i.ToString(new string('0', fnames.Length.ToString().Length)) + ".txt");                File.Move(fnames[i], newPath);            }        }

Directory

(1) 增

            //创建文件夹

        Directory.CreateDirectory("F://2.exe");

(2)删

            Directory.Delete("f://1", true); //直接删除，在回收站中再找不到了

(3)和File的使用基本一样 

(4)得到文件夹下面的子文件夹

            string[] subDir=Directory.GetDirectories("文件夹路径");

(5)得到文件夹下面的所有子文件

string[] file= Directory.GetFiles("文件夹路径");  //先创建几个文件string type = "mp3|mp4|doc|rmvb|txt|xls|exe|avi";  string path = @"F:/file";if(!Directory.Exists(path)){      Directory.Create(path);}Random rand=new Random();string[] ts=type.Split('|');for (int i = 0; i < 100; i++){    File.Create(Path.Combine(path, Path.ChangeExtension(i.ToString(), ts[rand.Next(ts.Length)])));}     string[] files = Directory.GetFiles(@"F:/file", "*.txt");