C # forms WinForm file operations

File and folder operations

C/s:winform can manipulate client files
b/S: Browser service brower Server

Namespaces: Using System. IO;

1. File class: Files

Create: File.create (path); Create file, return FileStream

FileStream fs = file.create (path), after which it needs to be closed or not open, fs.close ();

Delete: File.delete (path); no return value

To copy a file: File.Copy (source file, target file);

Cut Files: File.move (source file path, target path);

determine if the file exists: File.exists (path); Return Boolean, True indicates existing

file encryption: File.encrypt (); The file name becomes green or the current user can open the copy to another user that cannot be opened

file decryption: File.decrypt ();

File.getcreationtime (path); Gets the creation time , returning the datetime type Setcreationtime (path, datetime type); Modify creation Time

File.getlastaccesstime (path); Last access Time , returns the datetime type Setlastaccesstime (path, datetime type); Modify Access Time

File.getlastwritetime (path); Last modified time , return datetime type Setlastwritetime (path, datetime type); Modify Modification Time

2. Directory classes, directories (folders)

Directory.　　CreateDirectory (path); Create a directory

Directory.　　Delete (path); Delete directory

Directory.　　Exists (path); whether the directory exists

Three-time get and set same file class

Directory. 　　GetDirectories (path); gets a subdirectory that returns a string array

Directory. 　　　　　 GetFiles (path); Get child Files! Name! , returns a string array , string[] s = Directory. GetFiles (path);

Directory.  Getdirectoryroot (path); Get root directory

Directory. 　　　　 GetParent (path); get top level directory

3. FileInfo class

Is the instance method, need to create object new to use, above is the static method of file

To create a file: FileInfo f = new FileInfo (path); FileStream s = f.create (); S.close ();

To delete a file: FileInfo f = new FileInfo (path); F.delete ();

To copy a file: FileInfo f = new FileInfo (path), F.copyto (target path, whether overwrite (true is overwrite));

To move a file: FileInfo f = new FileInfo (path); F.moveto (target path);

whether the file exists: FileInfo f = new FileInfo (path); bool B = f.exists; Boolean, is a property

Get file name: FileInfo f = new FileInfo (path); string s = F.fullname; property, file name with path

Get creation Time: DateTime d = f.creationtime; All three times are the same property

Set creation time:f.creationtime = DateTime.Now.AddDays (100); All three of them are the same.

get file Size:f.length

4. DirectoryInfo class

To Create a directory: DirectoryInfo d = new DirectoryInfo (path); D.create ();

Delete directory: d.delete ();

Mobile Directory: D.moveto (target path);

whether the directory exists: bool B = d.exists;

Get directory Full name: d.fullname;

get the Sub file! Object Information! : fileinfo[] f = d.getfiles (); Returns an array of file objects, the contents of which are more detailed, D.getfiles ("*.exe") only get EXE files

Get subdirectories: directoryinfo[] dr = D.getdirectories ();

Example: (with recursion)

1. Get all the files under the folder and output

        Get all files under folder and output        private void Getallfiles (string path)         {            //Build Folder information Object            DirectoryInfo df = new DirectoryInfo (path);            Get all files under this folder            fileinfo[] Fsz = df. GetFiles ();            Output file Information            foreach (FileInfo data in Fsz)            {                richTextBox1.Text + = data. FullName + "|***|";             }            Get all subfolders under the folder            directoryinfo[] Dsz = df. GetDirectories ();            Traverse            foreach (DirectoryInfo Datad in Dsz)             {                getallfiles (Datad. FullName);             }        }

2. To a folder, get the number of all files in the folder

        private void Button1_Click (object sender, EventArgs e)        {            Label1. Text = FileCount (@ "E:\test"). ToString ();        }        private int fcount = 0;        private int FileCount (string path)        {            //Create folder information Object            DirectoryInfo dwjj = new DirectoryInfo (path);            Take the number of files under the current folder            Fcount + = Dwjj. GetFiles (). Length;            Take all folders in the current directory            , foreach (DirectoryInfo d in DWJJ. GetDirectories ())            {                filecount (d.fullname);            }            return fcount;                  }

3. To a folder, get the number of folders under the file

        private int dcount = 0;        private int Dircount (string path)        {            //Create a Folder information object            DirectoryInfo d = new DirectoryInfo (path);            Take all folders under the directory            directoryinfo[] df = d.getdirectories ();            Cumulative number of folders            DCount + = df. Length;            Traverse all Folders            foreach (DirectoryInfo w in df)            {                dircount (w.fullname);            }            return dcount;        }        private void Button2_Click (object sender, EventArgs e)        {            Label2. Text = Dircount (@ "E:\test"). ToString ();        }

4. To a folder, get the folder size

        private void Button3_Click (object sender, EventArgs e)        {            label3. Text = Dirsize (@ "E:\test"). ToString ();        }        Private long size = 0;        Private long Dirsize (string path)        {            //Create a directory information object            DirectoryInfo d = new DirectoryInfo (path);            Take all files in the current directory,            foreach (FileInfo data in D.getfiles ())            {                size + = data. Length;            }            Take all folders in the current directory,            foreach (DirectoryInfo data in D.getdirectories ())            {                dirsize (data). FullName);            }            return size;        }

5. To a folder, delete the folder

        private void Button4_Click (object sender, EventArgs e)        {            Deletedir (@ "E:\test");        }        private void Deletedir (string path)        {            //Build directory information Object            DirectoryInfo d = new DirectoryInfo (path);            Remove all files from the directory and delete the            foreach (FileInfo data in D.getfiles ())            {                data. Delete ();            }            Delete the subfolder            foreach (DirectoryInfo data in D.getdirectories ())            {                deletedir (data. FullName);            }            Delete empty folder            D.delete ();        }

C # forms WinForm file operations