This example shows how to split files and merge files in C# .Net.
FileStream Open File [C#]:
By using the FileStream class, files can be opened for reading or writing; this article is about how to load and save files using FileStream in C#. The FileStream class has "FileMode" and "FileAccess" enumerations as parameters.
[C#] Open existing file for reading:
FileStream fileStream = new FileStream(@"c:\file.txt", FileMode.Open, FileAccess.Read);
Prepare Windows form:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
namespace Splitfiles
{
public partial class Form1 : Form
{
public FileStream fs;
string mergeFolder;
public Form1()
{
InitializeComponent();
}
List<string> Packets = new List<string>();
//Merge file is stored in drive
string SaveFileFolder = @"c:\";
//Code Under Brows button:
private void brows_Click(object sender, EventArgs e)
{
try
{
openFileDialog1.ShowDialog();
txtBrowsFile.Text = openFileDialog1.FileName;
fs = new FileStream(txtBrowsFile.Text, FileMode.Open, FileAccess.Read);
int FileLength = (int)fs.Length / 1024;
string name = Path.GetFileName(txtBrowsFile.Text);
}
catch (Exception ex)
{
lblSendingResult.Text = "EXCEPTION:" + ex;
}
}
//Code Under Split button:
private void btnSplit_Click(object sender, EventArgs e)
{
SplitFile(txtBrowsFile.Text, Convert.ToInt32(5));
listBox1.Items.Add(Packets[0].ToString());
listBox1.Items.Add(Packets[1].ToString());
listBox1.Items.Add(Packets[2].ToString());
listBox1.Items.Add(Packets[3].ToString());
listBox1.Items.Add(Packets[4].ToString());
}
public bool SplitFile(string SourceFile, int nNoofFiles)
{
bool Split = false;
try
{
FileStream fs = new FileStream(SourceFile, FileMode.Open, FileAccess.Read);
int SizeofEachFile = (int)Math.Ceiling((double)fs.Length / nNoofFiles);
for (int i = 0; i < nNoofFiles; i++)
{
string baseFileName = Path.GetFileNameWithoutExtension(SourceFile);
string Extension = Path.GetExtension(SourceFile);
FileStream outputFile = new FileStream(Path.GetDirectoryName(SourceFile) + "\\" + baseFileName + "." +
i.ToString().PadLeft(5, Convert.ToChar("0")) + Extension + ".tmp", FileMode.Create, FileAccess.Write);
mergeFolder = Path.GetDirectoryName(SourceFile);
int bytesRead = 0;
byte[] buffer = new byte[SizeofEachFile];
if ((bytesRead = fs.Read(buffer, 0, SizeofEachFile)) > 0)
{
outputFile.Write(buffer, 0, bytesRead);
//outp.Write(buffer, 0, BytesRead);
string packet = baseFileName + "." + i.ToString().PadLeft(3, Convert.ToChar("0")) + Extension.ToString();
Packets.Add(packet);
}
outputFile.Close();
}
fs.Close();
}
catch (Exception Ex)
{
throw new ArgumentException(Ex.Message);
}
return Split;
}
//Code Under Merge button:
//Files have been merged and saved at location C:\\"
private void btnMergeFile_Click(object sender, EventArgs e)
{
MergeFile(mergeFolder);
}
public bool MergeFile(string inputfoldername1)
{
bool Output = false;
try
{
string[] tmpfiles = Directory.GetFiles(inputfoldername1, "*.tmp");
FileStream outPutFile = null;
string PrevFileName = "";
foreach (string tempFile in tmpfiles)
{
string fileName = Path.GetFileNameWithoutExtension(tempFile);
string baseFileName = fileName.Substring(0, fileName.IndexOf(Convert.ToChar(".")));
string extension = Path.GetExtension(fileName);
if (!PrevFileName.Equals(baseFileName))
{
if (outPutFile != null)
{
outPutFile.Flush();
outPutFile.Close();
}
outPutFile = new FileStream(SaveFileFolder + "\\" + baseFileName + extension, FileMode.OpenOrCreate, FileAccess.Write);
}
int bytesRead = 0;
byte[] buffer = new byte[1024];
FileStream inputTempFile = new FileStream(tempFile, FileMode.OpenOrCreate, FileAccess.Read);
while ((bytesRead = inputTempFile.Read(buffer, 0, 1024)) > 0)
outPutFile.Write(buffer, 0, bytesRead);
inputTempFile.Close();
File.Delete(tempFile);
PrevFileName = baseFileName;
}
outPutFile.Close();
lblSendingResult.Text = "Files have been merged and saved at location C:\\";
}
catch
{
}
return Output;
}
}
}