FileStream file stream in c #

FileStream file stream in c #
File stream

FileStream, StreamReader, and StreamWriter can operate large files;
FileStream operation byte; can operate on any type of files;
StreamReader and StreamWriter operator characters;

FileStream

Method Name	Function	Parameters
FileStream ()	Create a FileStream object	The first is the path, the second is the file mode FIleMode enumeration, and the third is the data mode FileAcess.
Read ()	Partial File Reading, returns the actual number of valid bytes read. If the number of bytes read is not specified by the third parameter, It is null.	The first is the stored byte array, which indicates where to put the array in the array ?, Maximum number of reads per time
Write ()	Write a byte array	The first parameter is a byte array, the second parameter indicates where the data is written, and the third parameter indicates the maximum number of data writes.
Close (), dispose ()	Close the stream and release the resources occupied by the stream.

FileMode OpenOrCreate, Append
FileAcess. Read, Write, ReadWirte

Writing the process of creating a file stream object in using will automatically help us release resources;

StreamReader and StreamWriter

It can be used to read and format text files;
There are ReadLine and Write WriteLine Methods

Using System; using System. collections. generic; using System. diagnostics; using System. IO; using System. linq; using System. text; using System. threading. tasks; Use FileStream to read and write files in namespace {class Program {static void Main (string [] args) {String str = @ "E: \ Download \ Software "; stopwatch sw = new Stopwatch (); sw. start (); using (FileStream fsWriter = new FileStream (str + @ "\ opencv-3.0.exe", FileMode. create, FileAccess. writ E) {using (FileStream fsReader = new FileStream (str + @ "\ opencv-2.4.9.exe", FileMode. open, FileAccess. read) {byte [] bytes = new byte [1024*4]; // 4 kb is suitable; int readNum; while (readNum = fsReader. read (bytes, 0, bytes. length ))! = 0) // indicates that the read is complete {fsWriter. write (bytes, 0, readNum) ;}// suing reader} // using writer sw. stop (); Console. writeLine ("total running time: {0}", sw. elapsedMilliseconds); Console. readKey () ;}// main} // class}