Path strings are manipulated by path
Get suffix
Can merge paths
Get file name
Directory operations by directory and DirectoryInfo
To determine whether a directory exists
Create a table of contents
Delete Directory
Get all subdirectories under directory
Get all the subfolders under the directory
File and FileInfo to manipulate files
Read files
Write a file
Append files
To determine whether a file exists
Create a file
deleting files
1. Path class
Copy Code code as follows:
Using System;
namespaces for using system.io;//directory and file operations
Namespace _11_path Class {
Class Program {
static void Main (string[] args) {
String path = "C:\\abc\\1.txt";
Note Here is the operation of the path string instead of the real file "modify" support string level, no really renamed file
Path = path.changeextension (path, "avi")//changeextension () modify file suffix Name 1.avi C:\\abc\\1.avi
Combining two paths into one path is better than using +, so it is convenient to solve the problem of whether or not to add a slash, and handle the path separator automatically.
Path = Path.Combine ("c:\\abc\\def\\", "1.jpg"); C:\abc\def\1.jpg
The location of the folder where the file is located is also handled from the angle of the string
Path = path.getdirectoryname (path);//c:\abc
Path = path.getextension (path);//extension. txt
Path = path.getfilename (path);//filename. suffix name 1.txt
Path = path.getfilenamewithoutextension (path);//filename with no suffix 1
Path = Path.GetFullPath ("11-path class. exe");//File full path (usually not in the same way as the full path of a file) F:\PIZIYIMAO\11-Path class \bin\debug\11-path class. exe
Path = Path.gettempfilename ();//temporary folder save path automatically create file C:\Documents and settings\piziyimao\local settings\temp\tmp5e.tmp
Path = Path.gettemppath ()//Get temporary folder save path C:\Documents and settings\piziyimao\local settings\temp\
Console.WriteLine (path);
Console.read ();
}
}
}
2, Operation directory category directory and DirectoryInfo
Copy Code code as follows:
Using System;
Using System.IO;
Namespace _12_directory {
Class Program {
static void Main (string[] args) {
DirectoryInfo dic = new DirectoryInfo ("C:\\abc");
Dic. Name; Get file name
Dic. FullName; Getting file full-path functionality is a powerful difference from directory because it is an instance class and the latter is a static class
Directory. CreateDirectory ("C:\\abc"); Create a folder
Directory. CreateDirectory ("C:\\abc\\1\\2\\3\\4\\5\\6\\7"); Continuously create multilevel folders
if (Directory). Exists ("C:\\ABC"))//Determine if a folder exists
{
Directory. Delete ("C:\\abc"); If it is present, delete if the folder is empty and the normal delete is not empty, the error "Directory is not Empty"
Directory. Delete ("C:\\abc", true); True specifies that the delete operation is also performed if the folder is not empty
}
string [] paths = Directory. GetDirectories ("C:\\abc"); To get all the subdirectory names in the directory note that only one level is removed c:\abc\1 This method is available for all folder paths under the Windows folder
string [] Paths2 = Directory. GetDirectories ("C:\\Windows", "$*"); The above method overload implementation retrieves a file that begins with $
string [] Paths3 = Directory. GetDirectories ("C:\\abc", "*", searchoption.) alldirectories);//wildcard find eligible files in a folder including child folders
foreach (string path in paths) {
Console. WriteLine (path);
}
string [] files = Directory. GetFiles ("C:\\Windows"); Traverse all files under a folder
string [] Files2 = Directory. GetFiles ("C:\\Windows", "*.ini", SearchOption. alldirectories);//Wildcard lookup directory for file usage similar to GetDirectories
foreach (string file in Files2) {
Console. WriteLine (file);
}
The most important thing about directory operations is the GetFiles and GetDirectories methods
Directory. GetParent ("C:\\abc\\1\\2\\3\\4\\5\\6\\7"); Returns the parent directory of the 7 folder C:\abc\1\2\3\4\5\6
Console. Read ();
}
}
}
3, File class files
Copy Code code as follows:
using System;
using System.IO;
using System.Text;
Namespace _13_file {
Class program {
static void Main (string[] args) {
//file static classes need to be aware of the file default encoding when using the files class If the encoding is incorrect, the garbled
file is displayed. Appendalltext ("C:\\1.txt", "gb1232"); Append content to the C:\\1.txt file "gb2312"
//If there is a write file
if. Exists ("C:\\1.txt")) {
File. WriteAllText ("C:\\1.txt", "written in Chinese sometimes garbled) you need to use the third parameter to specify the encoding format of the Encoding file default format", Encoding. Default);//writealltext is a thorough overwrite and Appendalltext is appended
}
//file.readalltext ();//Read file no longer enumerates the following methods to view a document No more examples
//string [] ReadAllLines (string path)//Read text file into string array
//string ReadAllText (string path)/Read text file to string
//writealllines (s Tring path,string[] Contents, the old content is overwritten by saving the string array to the path of the file line by row.
FileInfo fi = new FileInfo ("C:\\2.txt");//instantiated class features are more powerful than file
Fi. AppendText (); It has many methods and properties to view the document itself
Console. Read ();
}
}
}
