The path class and the directory class and the file class

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Path action on a string of paths

Get suffix

Can merge paths

Get file name

Directory and DirectoryInfo operations on directories

Determine if a directory exists

Create a Directory

Delete Directory

Get all subdirectories under directory

Get all the sub files in the directory

File and FileInfo operations on files

Read the file

Write a file

Append file

Determine if a file exists

Create a file

deleting files

1. Path class

1 usingSystem;2 usingSystem.IO;//Namespaces for directory and file operations3 namespace_11_path Class {4     classProgram {5         Static voidMain (string[] args) {6             stringPath ="C:\\abc\\1.txt" ;7             //Note here is the operation on the path string instead of the real file "modify" support string level, no really renaming the file8Path = path.changeextension (path,"avi");//changeextension () modify the file suffix name 1.avi c:\\abc\\1.avi9             //combine two paths to a path, better than +, can be convenient to solve the problem is not a diagonal line, automatically handle the problem of path separatorsTenPath = Path.Combine ("c:\\abc\\def\\","1.jpg");//c:\abc\def\1.jpg One             //The location of the folder where the files are located is also handled from a string perspective APath = path.getdirectoryname (path);//C:\ABC -Path = path.getextension (path);//extension. txt -Path = path.getfilename (path);//file name. suffix name 1.txt thePath = path.getfilenamewithoutextension (path);//file name without suffix 1 -Path = Path.GetFullPath ("11-path class. exe");//file full path (relative to the full path of the file generally does not use this method) F:\PIZIYIMAO\11-Path class \bin\debug\11-path class. exe -Path = Path.gettempfilename ();//temporary folder save path automatically creates files 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 (); +         } A     } at}

2, Operation directory and DirectoryInfo

1 usingSystem;2 usingSystem.IO;3 namespace_12_directory {4     classProgram {5         Static voidMain (string[] args) {6DirectoryInfo dic =NewDirectoryInfo ("C:\\ABC" );7             //DiC. Name; //Get file name8             //DiC. FullName; //getting the file full path feature is more powerful than directory, except that it is an instance class and the latter is a static class9Directory. CreateDirectory ("C:\\ABC");//Create a folderTenDirectory. CreateDirectory ("c:\\abc\\1\\2\\3\\4\\5\\6\\7");//create multi-level folders consecutively One             if(Directory. Exists ("C:\\ABC"))//determine if a folder exists A             { -Directory. Delete ("C:\\ABC");//Delete if the folder is empty can be deleted if it is not empty then the error "Directory is not Empty" -Directory. Delete ("C:\\ABC",true);//true Specifies that if the folder is not empty, the same delete operation is performed the             } -             string[] paths = Directory. GetDirectories ("C:\\ABC");//get all subdirectory names in the directory note that you can use this method only if you remove a level that is c:\abc\1, such as getting all the folder paths under the Windows folder -             string[] Paths2 = Directory. GetDirectories ("C:\\Windows","$*");//the above method overload implementation retrieves the file starting with $ -             string[] PATHS3 = Directory. GetDirectories ("C:\\ABC","*", SearchOption. Alldirectories);//wildcard find eligible files in a folder include child folders +             foreach(stringPathinchpaths) { - Console. WriteLine (path); +             } A             string[] files = Directory. GetFiles ("C:\\Windows");//traverse all files under a folder at             string[] Files2 = Directory. GetFiles ("C:\\Windows","*.ini", SearchOption. Alldirectories);//Wildcard Lookup directory file usage is similar to GetDirectories -             foreach(stringFileinchfiles2) { - 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 in Console. Read (); -         } to     } +}

3. File type

usingSystem;usingSystem.IO;usingSystem.Text;namespace_13_file {classProgram {Static voidMain (string[] args) {            //File static classes need to be aware of the use of files when the default encoding is used if the encoding is incorrect in the file display garbledFile. Appendalltext ("C:\\1.txt","gb1232");//Append Content "gb2312" to the C:\\1.txt file//If there is a write file            if(File. Exists ("C:\\1.txt") ) {File. WriteAllText ("C:\\1.txt","writing in Chinese sometimes garbled requires using the third parameter to specify the encoding format of the encoding file, default format", Encoding. Default);//WriteAllText is completely covered and appendalltext is appended            }            //File.readalltext ();//reading a file no longer enumerates the following methods to view the document no longer an example//string[] ReadAllLines (string path)//reading a text file into an array of strings//string ReadAllText (string path)//reading a text file into a string//writealllines (String path,string[] contents),//saving a string array row-by-line to the file path overwrites the old content. FileInfo fi =NewFileInfo ("C:\\2.txt");//instantiated class functionality is more powerful than fileFi. AppendText ();//It has a lot of methods and properties to view the document yourselfConsole.        Read (); }    }}

Path class and directory class and file class