Article 2 of file stream learning notes in C #

In this blog, I will talk about some other file streams in C # based on the previous article, this article describes several File stream operations, including reading and writing StreamReader, StreamWriter, File, and Directory operations.

1. FileStream class control

(1) Flush (); clears the buffer for this stream to protect the hard disk

Static void Main (string [] args) {using (FileStream filewrite = new FileStream ("file.txt", FileMode. create, FileAccess. write) {filewrite. writeByte (101); filewrite. writeByte (101); // clears the buffer filewrite for this stream. flush (); filewrite. writeByte (101); filewrite. writeByte (101); // the hard disk is frequently operated upon each write ,}}

(2) Seek (offset, position enumeration)

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);            }}

1. Other streams

(1) memory stream of MemoryStream

MemoryStream MS = new MemoryStream ();

(2) NetworkStream network stream

NetworkStream ns = new NetworkStream ();

1. Read/write stream

(1) StreamReader

// Read the static void Main (string [] args) {using (FileStream fileRead = new FileStream ("Success .txt", FileMode. open, FileAccess. read) {using (StreamReader sr = new StreamReader (fileRead, Encoding. default) {// first reading method // string str = sr. readLine (); // while (str = sr. readLine ())! = Null) // {// Console. WriteLine (str); //} // method 2 Console. WriteLine (sr. ReadToEnd ());}}}

(2) StreamWriter

Static void Main (string [] args)

{

Using (StreamWriter sw = new StreamWriter ("Success .txt "))

{

Sw. WriteLine ();

}

}

1. File

(1) File Reading Method

1) Use a File to read the stream

// Performance loss

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

2) File Management

-> Create a file

File. Create ("f: \ Han Yinglong .txt", 10*1024*1024 );

-> Delete an object

File. Delete ("f: \ Han Yinglong .txt ");

-> File query

Bool isExist = File. Exists ("f: \ Han Yinglong .txt ");

Console. WriteLine (isExist );

(2) FileInfo

1) create a file

FileInfo file = new FileInfo ("f: \ Han Yinglong .txt"); // The file exists in the memory.

File. Create (); // Create a file

2) Set Properties

File. Attributes = FileAttributes. ReadOnly; // view the Attributes

(3) Copy method

File. Copy ("f :\\ Han Yinglong .txt", "f :\\ 111.txt ");

(4) Move the Move Method

File. Move ("f :\\ Han Yinglong .txt", "f :\\ 1 \ Han Yinglong .txt ");

(5) modify all file names

Static void Main (string [] args) {string [] fnames = Directory. getFiles ("f: \ 1"); // The Sort method of Array can Sort the Array. sort (fnames); for (int I = 0; I <fnames. length; I ++) {string temp = fnames [I]; // obtain the file name string fileName = Path. getFileName (temp); // obtain the path string Path = path. getDirectoryName (temp); // new file name string newPath = Path. combine (path, I. toString (new string ('0', fnames. length. toString (). length) + ". txt "); File. move (fnames [I], newPath );}}

1. Directory

(1) Increase

// Create a folder

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

(2) Delete

Directory. Delete ("f: \ 1", true); // directly Delete the file. The file cannot be found in the recycle bin.

(3) The use of File is basically the same.

(4) obtain the subfolders under the folder.

String [] subDir = Directory. GetDirectories ("folder path ");

(5) obtain all the sub-files in the folder.

String [] file = Directory. getFiles ("folder path"); // create several files first 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 ");