C#中的文件流StreamReader、StreamWriter和File類等操作學(xué)習(xí)

這篇主要介紹幾個(gè)操作文件流的類，讀寫(xiě)類StreamReader,StreamWriter和File類以及Directory類的操作

FileStream類的控制

(1) Flush();  清除此流的緩沖區(qū)，是為了保護(hù)硬盤(pán)

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static void Main(string[] args) {             using (FileStream filewrite = new FileStream("file.txt", FileMode.Create, FileAccess.Write))             {                 filewrite.WriteByte(101);                 filewrite.WriteByte(101);                 //清除此流的緩沖區(qū)                 filewrite.Flush();                 filewrite.WriteByte(101);                 filewrite.WriteByte(101);                 //每次寫(xiě)一個(gè)直接就會(huì)頻繁的操作硬盤(pán)，             } }

(2)Seek(偏移，位置枚舉)

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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 內(nèi)存流

            NetworkStream ns = new NetworkStream();

(2)NetworkStream 網(wǎng)絡(luò)流

            MemoryStream ms = new MemoryStream();

讀寫(xiě)流

(1) StreamReader

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//讀取文件流         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))                 {                     //第一種讀法                     //string str = sr.ReadLine();                     //while ((str = sr.ReadLine()) != null)                     //{                     //    Console.WriteLine(str);                     //}                     //第二種讀法                     Console.WriteLine(sr.ReadToEnd());                 }             }         }

(2)StreamWriter

            static void Main(string[] args)

        {

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

            {

                sw.WriteLine();

            }

        }

File

(1) File關(guān)于文件讀取的方法

            1)使用File文件讀取流

                   //損失性能

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

            2)管理文件

                   ->創(chuàng)建文件

                          File.Create("f:\\韓迎龍.txt", 10 * 1024 * 1024);

                   ->刪除文件

                          File.Delete("f:\\韓迎龍.txt");

                   ->查文件

                          bool isExist = File.Exists("f:\\韓迎龍.txt");

                          Console.WriteLine(isExist);

(2)FileInfo

            1)創(chuàng)建文件

                   FileInfo file = new FileInfo("f:\\韓迎龍.txt"); //在內(nèi)存中存在

            file.Create();  //創(chuàng)建文件

            2)設(shè)置屬性

                   file.Attributes = FileAttributes.ReadOnly; //在屬性中查看

(3)Copy方法 復(fù)制

            File.Copy("f:\\韓迎龍.txt", "f:\\111.txt");

(4)Move方法 移動(dòng)

            File.Move("f:\\韓迎龍.txt", "f:\\1\\韓迎龍.txt");

(5)修改文件的全部名稱

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static void Main(string[] args)         {             string[] fnames = Directory.GetFiles("f:\\1");             //Array的Sort方法可以對(duì)數(shù)組進(jìn)行排序             Array.Sort(fnames);             for (int i = 0; i < fnames.Length; i++)             {                 string temp = fnames[i];                 //獲得文件名                 string fileName = Path.GetFileName(temp);                 //獲得路徑名                 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

            //創(chuàng)建文件夾

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

(2)刪

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

(3)和File的使用基本一樣  

(4)得到文件夾下面的子文件夾

            string[] subDir=Directory.GetDirectories("文件夾路徑");

(5)得到文件夾下面的所有子文件

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string[] file= Directory.GetFiles("文件夾路徑");   //先創(chuàng)建幾個(gè)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");