C IO stream (II) extension class_ Packer

One 、C# IO Stream Stream extension class

C＃ The following standards are included IO（ Input / Output ） class , From different sources （ Such as files , Memory , The Internet , Isolated storage, etc ） To read / write in .

flow (Stream)： System.IO.Stream  Is an abstract class , Provides the byte （ read , Writing, etc ） Standard method of transfer to source . Transfer bytes just like wrapper classes . Need to read from a specific source / Classes that write bytes must implement Stream class .

The following classes inherit Stream class , To provide the ability to read from a specific source / The function of writing bytes ：

FileStream： Read bytes from or write bytes to a physical file , Whether it is .txt,.exe,.jpg Or any other document .FileStream Derive from Stream class .

MemoryStream： MemoryStream Read or write bytes stored in memory .

BufferedStream： BufferedStream From the other Stream Read or write bytes , To improve some I / O Performance of operation .

NetworkStream： NetworkStream Read or write bytes from a network socket .

PipeStream： PipeStream Read or write bytes from different processes .

CryptoStream： CryptoStream Used to link a data stream to a cryptographic transformation .

Two 、C# IO Stream Readers and writers

1. character string   Readers and writers

StreamReader：StreamReader Is a helper class , Used to convert bytes to characters from by using encoded values Stream Read character . It can be used from different streams （ for example FileStream,MemoryStream etc. ） Read string from （ character ）.

StreamWriter：StreamWriter Is a helper class , Used to write a string to by converting characters to bytes Stream. It can be used to write strings to different streams , for example FileStream,MemoryStream etc. .

2. Binary system Readers and writers

BinaryReader：BinaryReader Is a helper class for reading raw data types from bytes .

BinaryWriter：BinaryWriter Write primitive types in binary .

The image above shows ,FileStream Read bytes from physical file , then StreamReader Read the string by converting these bytes to a string . Again ,StreamWriter Get a string and convert it to bytes , And then write FileStream, then FileStream Write bytes to a physical file . therefore ,FileStream Processing bytes ,StreamReader and StreamWriter Processing strings .

3、 ... and 、 Often tidy up

1. Stream Is an abstract class for transferring bytes from different sources . It is the base class for all other classes , These other classes read bytes / Write to different sources .

2. FileStream Class provides byte read and write functions for physical files .

3. The reader / writer class provides the slave stream class （FileStream,MemoryStream etc. ） The function of reading bytes and converting bytes into appropriate encoding .

4. StreamReader By converting bytes to strings , Provides an auxiliary method to get information from FileStream Read string from .StreamWriter Provides a helper method , You can write a string to by converting it to bytes FileStream.

more ：

C# IO Stream flow （ One ） Basic concepts _ The basic definition

C# Array grouping _C# The data packet _C# Linq Use groups to organize

C# Available types in _ Type not available _C# Double question mark _C# Question mark point _C# null It's not equal to