C # File operations

File operations

File class, FileInfo class. Using System.IO Namespace
(i) Create

Method One:

1         private string path = @ "F:\Text\aaa.txt"; 2         private void Createfile_click (object sender, EventArgs e) 3         {4< C6/>filestream fs = file.create (path); 5             fs. Close ();//return FileStream must free stream 6         }

Method Two:

1         private string path = @ "F:\Text\aaa.txt"; 2         private void Createfile_click (object sender, EventArgs e) 3         {            4             FileInfo CreateFile = new FileInfo (path); 5             FileStream stream = Createfile.create (); 6             stream. Close ();//return FileStream type must free stream 7         }

(ii) deletion

Method One:

1         private string path = @ "F:\Text\aaa.txt"; 2         private void Deletefile_click (object sender, EventArgs e) 3         {4< C5/>file.delete (path); 5         }

Method Two:

1         private string path = @ "F:\Text\aaa.txt"; 2         private void Deletefile_click (object sender, EventArgs e) 3         { C11/>4             FileInfo deletefile = new FileInfo (path); 5             Deletefile.delete (); 6         }

(c) whether there is

Method One:

1         private string path = @ "F:\Text\aaa.txt"; 2         private void Existfile_click (object sender, EventArgs e) 3         {4
   bool ex = file.exists (path);             5              if (ex) 6              {7                  MessageBox.Show ("presence"), 8              } 9              else10              {one                  MessageBox.Show ("nonexistent"); 12              }13         }

Method Two:

1         private string path = @ "F:\Text\aaa.txt"; 2         private void Existfile_click (object sender, EventArgs e) 3         {
   4              FileInfo existfile = new FileInfo (path), 5              bool ex = existfile.exists, 6              if (ex) 7              {8                  MessageBox. Show ("presence"); 9              }10              else11              {                  MessageBox.Show ("not Present");              }14         }

(iv) Copying---cannot cross-drive characters

Method One:

1         private string path = @ "F:\Text\aaa.txt"; 2         private void Copyfile_click (object sender, EventArgs e) 3         {4             file.copy (path, @ "F:\Text\bbb.txt");//Copy the contents of the content also and copy 5         }

Method Two:

1  private void Copyfile_click (object sender, EventArgs e) 2         {          3             FileInfo CopyFile = new FileInfo (path); 4             Copyfile.copyto (@ "F:\Text\bbb.txt");//Copy the contents of the content also and copy 5         }

(v) Move (renamed)---cannot cross the drive letter

Note: Move () or MoveTo (): 1. Path with different names (equivalent to-cut),

2. Path different names (equivalent to-cut + rename),

3. The path same name is different (equivalent to-rename).

And move all the objects within the folder at the same time.

Method One:

1         private string path = @ "F:\Text\aaa.txt"; 2         private void Movefile_click (object sender, EventArgs e) 3         {4< C10/>file.move (Path, @ "F:\Test\bbb.txt");            5         }

Method Two:

1         private string path = @ "F:\Text\aaa.txt"; 2         private void Movefile_click (object sender, EventArgs e) 3         {           4             FileInfo MoveFIle = new FileInfo (path), 5             Movefile.moveto (@ "F:\Test\ccc.txt"); 6         }

(vi) Obtaining the file name

Note: Only one method of the FileInfo () class

1. Get the file name only (seemingly useless-the content of show () below is Aaa.txt)

1         private string path = @ "F:\Text\aaa.txt"; 2         private void Filename_click (object sender, EventArgs e) 3         {4             FileInfo FileName = new FileInfo (path); 5             String name = Filename.name;6             MessageBox.Show (name); 7         }

2. Or take the full name of the file (including the path)

1         private string path = @ "F:\Text\aaa.txt"; 2         private void Filename_click (object sender, EventArgs e) 3         {            4             FileInfo FileName = new FileInfo (path); 5             String name = Filename.fullname;6             MessageBox.Show (name); 7         }

(vii) Access to extensions

Note: Only one method of the FileInfo () class

1         private string path = @ "F:\Text\aaa.txt"; 2         private void Extensionname_click (object sender, EventArgs e) 3< C14/>{4             FileInfo extensionname = new FileInfo (path); 5             string exname = Extensionname.extension;6             MessageBox.Show (Exname); 7         }

(eight) Get auxiliary properties

Note: Only one method of the file () class

1         private string path = @ "F:\Text\aaa.txt"; 2         private void Getattribute_click (object sender, EventArgs e) 3         { 4             fileattributes Attributes = file.getattributes (path), 5             DateTime createtime = file.getcreationtime (path), 6             DateTime lastaccesstime = file.getlastaccesstime (path); 7             DateTime getlastwritetime =  file.getlastwritetime (path), 8             MessageBox.Show (attributes.tostring () + "\ n" + Createtime.tostring () + "\ n" +lastaccesstime.tostring () + "\ n" +getlastwritetime.tostring ()); 9         }

(ix) Modifying auxiliary properties

Note: Only one method of the file () class

        private string Path = @ "F:\Text\aaa.txt";        private void Button1_Click (object sender, EventArgs e)        {            fileattributes Attributes = new FileAttributes ();            Attributes = Fileattributes.hidden;            File.setattributes (path, Attributes);            File.setcreationtime (path, datetime.now);            File.setlastaccesstime (path, datetime.now);            File.setlastwritetime (path, DateTime.Now);        }

(10) Open Save

File read/write

Note: The class name is written first after opening new class. Close ()

FileStream class: More general.

Open it

1         private string path = @ "F:\Text\aaa.txt"; 2         private void Open_stream_click (object sender, EventArgs e) 3         {4             FileStream stream = new FileStream (path, filemode.open);//read data is stored in binary code Form 5             byte[] nr = new Byte[stream. Length]; 6             Stream. Read (NR,0,NR. Length); 7             Stream. Close (); 8             //Put the contents of byte[] into a string in the text box. 9             String s = System.Text.Encoding.Default.GetString (NR);             TextBox1.Text = s;11         }

Save

1         private string path = @ "F:\Text\aaa.txt"; 2         private void Save_stream_click (object sender, EventArgs e) 3         {4             //Turn the string of text boxes into binary arrays 5             byte[] nr = System.Text.Encoding.Default.GetBytes (TextBox1.Text); 6             //Send to file 7             FileStream stream = new FileStream (path, filemode.openorcreate); 8             Stream. Write (NR, 0, nr. Length); 9             Stream. Close ();         

StreamReader class:

Open it

1         private string path = @ "F:\Text\aaa.txt"; 2         private void Open_reader_click (object sender, EventArgs e) 3         {4             StreamReader reader = new StreamReader (path, encoding.default); 5             string s = Reader. ReadToEnd (); 6             reader. Close (); 7             TextBox1.Text = ""; 8             TextBox1.Text = s;9         }

Or

1         private string path = @ "F:\Text\aaa.txt"; 2         private void Open_writer_click (object sender, EventArgs e) 3
   
    {4             FileStream stream = new FileStream (path, FileMode.Open); 5             StreamReader reader = new StreamReader (Stream, E Ncoding. Default); 6             string s = Reader. ReadToEnd (); 7             Reader. Close (); 8             Stream. Close (); 9             TextBox1.Text = s;10         }
   

StreamWriter class:

1         private string path = @ "F:\Text\aaa.txt"; 2         private void Save_writer_click (object sender, EventArgs e) 3         {4             StreamWriter writer = new StreamWriter (path, false, Encoding.default); 5             writer. WriteLine (TextBox1.Text); 6             writer. Close (); 7         }

Or

1        private string path = @ "F:\Text\aaa.txt"; 2        private void Save_writer_click (object sender, EventArgs e) 3        {4            FileStream stream = new FileStream (path, filemode.openorcreate); 5            StreamWriter writer = new StreamWriter (stream); 6            writer. WriteLine (TextBox1.Text); 7            writer. Close (); 8            Stream. Close (); 9        }10     

C # File operations