C # (input and output streams)

I. system. Io namespace Of the. NET Framework class library

The system. Io namespace contains the types that allow reading and writing files and data streams, as well as the types that support basic files and directories.

II. C # filestream for file read/write

 
// Open a file directly using the filestream class
 

 
Filestream fs1 = file. Open ("C: // test.txt", Filemode. Open );
 

 
// Open the file "C: // test.txt" in append mode and write some content to "C: // test.txt"
 

 
Filestream fs2 = file. Open ("C: // test.txt", Filemode. append, fileaccess. Write );
 

// Open the file and clear the content before performing operations on the file
 

 
Filestream fs3 = file. Open ("C: // test.txt", Filemode. truncate, fileaccess. readwrite, fileshare. Read );
 

 
// This method creates a readable object and allows others to read the object content.
 

 
Filestream myfilestream1 =NewFilestream (@ "C:/testing.txt", Filemode. Create );
 

 

3 C # stream-based input/output
C # stream-based Input and Output.: Stream-connects to physical devices through the C # I/O system, that is, physical storage devices such as hard disks that are read and written at ordinary times. stream/stream methods and attributes include:

Void close ()	Close stream
Void flush ()	Clean content in the stream
Int readbyte ()	Returns an integer representing the number of input bytes. If no data is returned,-1 is returned.
Int read (byte [] Buf, int offset, int numbytes)	Reads numbytes bytes to the offset-based start position of byte [], and returns the number of successfully read bytes.
Long seek (long offset, seekorigin origin)	Locate the current position to the offset after the origin is the initial position
Void writebyte (byte B)	Write a single byte to an output stream
Void write (byte [] Buf, int offset, int numbytes)	Write byte [] Buf numbytes starting from offset
Bool Canread	Readable or not
Bool canseek	Addressing supported?
Bool canwrite	Whether data can be written
Long length	Stream Length
Long position	Current stream position

4-stream inheritance Structure

Stream is a large class. When reading and writing files, you can perform professional Data Reading and Writing through different streams.

 

Attributes and meanings of filemode

Filemode. Create	Create a file. A file with the same name will be destroyed.
Filemode. createnew	Create a new file, which does not exist before
Filemode. Open	Open an existing file
Filemode. openorcreate	Open the file if it exists. Otherwise, create a new file.
Filemode. truncate	Open an existing file and clear its content
Filemode. append	Write Data to the end of the file in the form of append

Attributes and definitions of fileaccess

fileaccess. Read	Read files
fileaccess. Write	write files
fileaccess. readwrite	read/write files