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1. The. NET Framework provides Files and directories classes. We can create, move and delete files or folders, and these classes and methods are inside System.IO.

2. Method structure diagram in IO

3. Note: The method of the folder is all static, so you cannot create an instance call but use the static method directly

4.

Principal methods of the Directory class (the basic method inside the folder Class)
Method	Use
CreateDirectory ()	Creates all directories and subdirectories specified by its path parameter
GetCreationTime ()	Returns and sets the time the specified directory was created
GetDirectories ()	Gets named directories
GetLogicalDrives ()	Returns the names of all the logical drives in the form <drive>:\
GetFiles ()	Returns the names of files matching a pattern
GetParent ()	Returns The parent directory for the specified path
Move ()	Moves a directory and its contents to a specified path

5. The folder information class can get information inside a folder, such as a subdirectory or a file inside a folder

Principal methods and properties of the DirectoryInfo class
Method or property	Use
Delete ()	Public method This deletes a DirectoryInfo and its contents from the path
GetDirectories ()	Public method This returns a DirectoryInfo array with subdirectories
GetFiles ()	Public method This returns a list of files in the directory
Getfilesysteminfos ()	Public method This retrieves an array of FileSystemInfo objects
MoveTo ()	Public method This moves a DirectoryInfo and its contents to a new path
Refresh ()	Public method inherited from FileSystemInfo; Refreshes the state of the object

6. The file class can get the content and content of the file itself.

Principal public static methods of the File class
Method	Use
AppendText ()	Creates a StreamWriter that appends text to the specified file
Copy ()	Copies an existing file to a new file
Create ()	Creates a file in the specified path
CreateText ()	Creates a StreamWriter that writes a new text file to the specified file
Delete ()	Deletes the specified file
Exists ()	Returns true if the specified file exists
GetAttributes (), SetAttributes ()	Gets or sets the fileattributes of the specified file

7. The file information class can get the record, name and other attributes of the file.

Method or property	Use
Attributes ()	Inherits from FileSystemInfo; Gets or sets the attributes of the current file
CreationTime	Inherits from FileSystemInfo; Gets or sets the creation time of the current file
Directory	Public property This gets an instance of the parent directory
Exists	Public property, Boolean value, is true if the directory exists
Extension	inherited from FileSystemInfo; That is, the file extension
FullName	inherited from FileSystemInfo; That's, the full path of the file or directory

LastAccessTime	inherited from FileSystemInfo; Gets or sets the last access time
LastWriteTime	Public property Inheritedfrom FileSystemInfo; Gets or sets the time when the current file or directory is last written to
Length	Public property which gets the size of the current file
Name	Public property Name of this DirectoryInfo instance
AppendText ()	Public method This creates a StreamWriter that appends text to a file
CopyTo ()	Public method This copies an existing file to a new file

Create ()	Public method that creates a new file
Delete ()	Public method that permanently deletes a file
MoveTo ()	Public method to move a file to a new location; Can is used to rename a file
Open ()	Public method This opens a file with various read/write and sharing privileges
OpenRead ()	Public method that creates a read-only FileStream
OpenText ()	Public method This creates a StreamReader that reads from an existing text file
OpenWrite ()	Public method that creates a write-only FileStream

8. There are many ways to read and write files, such as binary read and write tips: The path is preceded by a few escape characters

9. Buffer buffers are more efficient when large amounts of data are read and written, and calibration is required to ensure correct data

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