C # File Reading (1)

1. Steps for reading and writing files:

 

Create a file stream-create the corresponding reader-Execute read/write operations-close the reader-close the file stream

 

Create a file stream: filestream objfs = new filestream (file path, file opening mode );

File opening mode: filemode is an enumeration value, which is omitted here

Colleagues who create files can also set permissions.

Create a reader: streamreader objsr = new streamreader (objfs, encoding. utf8 );

Streamwriter objsw = new streamwriter (objfs, encoding. utf8 );

Enoding is used to solve the garbled problem.

Read/write operations: Read: objsr. readtoend ();

Write: objsw. Write (content );

 

Close reader: objsr. Close ();

Objsw. Close ();

 

Close file stream: objfs. Close ();

 

 

2. File class

 

Provides various methods for operating files.

Method	Description
Bool exists (string path)	Checks whether a specified file exists. This method returns a Boolean value.
Void copy (string Sourcefilename, String destfilename)	Copy the content in the source file of the specified path to the target file. If the target file does not exist, create a new file in the specified path.
Void move (string Sourcefilename, String destfilename)	Move the specified file to a new path
Void Delete (string path)	Delete the specified file,If the specified file does not exist, no exception is thrown.

 

3. The Directory class allows you to move or delete folders.

Method	Description
Bool exists (string path)	Used to check whether a specified folder exists on the disk
Void move (string Sourcedirname, String destdirname)	Used to move files or directories and their contents to a new location.
Void Delete (string path, Bool recursive)	Delete the specified directory. If boolTrueDelete all contents in the subdirectory.
Void Delete (string path)	Delete an empty directory from a specified path

3. fileinfo class

Because the static methods of the file class are used for security check, if you want to use a file object multiple times, you can use the corresponding instance method of the fileinfo class because security check is not always required.

 

Attribute/Method	Description
Exists	Checks whether a specified file exists and returns a Boolean value.
Extension	Obtain a string that represents the file extension.
Name	Get File Name
Fullname	Obtain the complete directory of a directory or file
Fileinfo copyto (string)	Copying existing files to new files does not allow overwriting of existing files
Void Delete ()	Permanently delete an object
Void moveTo (string)	Move the specified file to a new location

 

4. directoryinfo class

If you want to reuse a directory object multiple times, consider using the instance method of the directoryinfo class.

Method	Description
Directoryinfo [] getdirectories ()	Returns the array of subdirectory objects in the current directory.
Fileinfo [] getfiles ()	Returns the list of files in the current directory (fileinfoObject array)

 

 

Note: file and stream)

A file is an ordered collection of data permanently stored on various media. It is a basic object for data read/write operations.

Stream, in terms of concept, is very similar to a single disk file. It is also the basic object for data reading. The Stream provides us with a continuous byte stream storage space.

File class is a static class mainly used to provide some function libraries.

The static objects class provides many static methods that support basic file operations, including creating, copying, moving, deleting, and opening a file.

C # File Reading (1)