C # file splitting and merging Part 1 from the Internet)

This article briefly introduces how to use C # to merge and split files. In my project, I need to use the functions of this module, so I will post this article after practice, for backup:

First, let's split the file first. We created a new winform project. The project design is as follows:

The following controls are available:

An openfiledialog component used to select the large file to be split.

A progressbar component used to display the progress of file splitting.

A ComboBox component used to select the file split size.

The two textbox components are used to display the directories of files selected by the openfiledialog component and small files separated by input.

Four label components.
Then, add the following button ...:CodeOf course, you still need using system. IO;

 

 Browse files 

   Openfiledialog1.title  =    "  Select the name of the file to be split  "  ;
Dialogresult drtemp  =  Openfiledialog1.showdialog ();
  If  (Drtemp  =  Dialogresult. OK  &&  Openfiledialog1.filename  ! =     String . Empty)
{
Textbox1.text  =  Openfiledialog1.filename;
Button2.enabled  =     True  ;
} 

Then add the following code to the execution button:

 

 Execution button 

   Private     Void Button2_click (  Object  Sender, eventargs E)
{
  Int  Ifilesize  =  Int32.parse (combobox1.text)  *     1024  ;
  //  Set the size of the split small file according to the selection.  
    If (Directory. exists (textbox2.text ))
Directory. Delete (textbox2.text,  True  );
  //  If the computer has a directory for storing split files, delete all files in this directory.  
    Else  
Directory. createdirectory (textbox2.text );
  //  Otherwise, create a directory on the computer.  
  Filestream splitfilestream  = New  Filestream (textbox1.text, filemode. Open );
  //  Initialize the filestream file stream instance in the full path corresponding string and file opening mode.  
  Binaryreader splitfilereader  =  New  Binaryreader (splitfilestream );
  //  Initialize binaryreader with filestream file stream  
    Byte [] Tempbytes;
  //  Maximum data read by each split  
    Int  Ifilecount  =  (  Int  ) (Splitfilestream. Length  /  Ifilesize );
  //  Total number of small files  
 Progressbar1.maximum  =  Ifilecount;
  If  (Splitfilestream. Length  %  Ifilesize  ! =     0  ) Ifilecount  ++  ;
  String  [] Tempextra  = Textbox1.text. Split (  '  .  '  );
  /*  Split large files into multiple small files in a loop  */  
  For  (  Int  I  =     1  ; I <=  Ifilecount; I  ++  )
{
  String  Stempfilename  =  Textbox2.text  +     @"  \  "  +  I. tostring (). padleft (  4  , '  0  '  )  +     "  .  "     +  Tempextra [tempextra. Length  -     1  ];  //  Small file name
 //  Determine the file name of the small file  
  Filestream tempstream  =     New  Filestream (stempfilename, filemode. openorcreate );
  //  Initialize the filestream file stream instance based on the file name and file opening mode.  
  Binarywriter tempwriter  =     New Binarywriter (tempstream );
  //  Create and initialize a binarywriter instance using a filestream instance  
  Tempbytes  =  Splitfilereader. readbytes (ifilesize );
  //  Read data of a specified size from a large file  
  Tempwriter. Write (tempbytes );
  //  Write this data into a small file  
 Tempwriter. Close ();
  //  Close the writer to form a small file  
  Tempstream. Close ();
  //  Close file stream  
  Progressbar1.value  =  I  -     1  ;
}
Splitfilereader. Close ();
  // Close large file Reader  
  Splitfilestream. Close ();
MessageBox. Show (  "  Split successfully!  "  );
Progressbar1.value  =     0  ;

} 

Then, set the combox item and add the 720, 1440, and 2880 items.

Compile and run the following code:

Then look at the input directory, the following files will appear, my source file has 16 m, so there are many small files.