What would be the fastest way to concatenate three files in C#?

by

I support Mehrdad Afshari on his code being exactly same as used in System.IO.Stream.CopyTo.
I would still wonder why did he not use that same function instead of rewriting its implementation.

string[] srcFileNames = { "file1.txt", "file2.txt", "file3.txt" };
string destFileName = "destFile.txt";

using (Stream destStream = File.OpenWrite(destFileName))
{
    foreach (string srcFileName in srcFileNames)
    {
        using (Stream srcStream = File.OpenRead(srcFileName))
        {
            srcStream.CopyTo(destStream);
        }
    }
}

According to the disassembler (ILSpy) the default buffer size is 4096. CopyTo function has got an overload, which lets you specify the buffer size in case you are not happy with 4096 bytes.

More Related Contents:

  1. Natural Sort Order in C#
  2. Easiest way to read from and write to files
  3. How to download a file from a URL in C#?
  4. Free file locked by new Bitmap(filePath)
  5. How to find the most recent file in a directory using .NET, and without looping?
  6. How to compare 2 files fast using .NET?
  7. How to detect a USB drive has been plugged in?
  8. determine if file is an image
  9. In C# check that filename is *possibly* valid (not that it exists) [duplicate]
  10. How to find the extension of a file in C#?
  11. Should I store my images in the database or folders? [duplicate]
  12. Read last line of text file
  13. Retrieving files from directory that contains large amount of files
  14. Can I simply ‘read’ a file that is in use?
  15. How to insert characters to a file using C#
  16. WPF/C#: Where should I be saving user preferences files?
  17. Writing file to web server – ASP.NET
  18. ReadAllLines for a Stream object?
  19. How to get the actual (localized) folder names? [duplicate]
  20. How do I get the directory from a file’s full path?
  21. Sending Files using HTTP POST in c# [closed]
  22. Getting files by creation date in .NET
  23. How do I detect when a directory or file changes without constant scanning
  24. Image file copy, is being used by another process
  25. .NET 4.5 file read performance sync vs async
  26. C#: How to open Windows Explorer windows with a number of files selected
  27. Encrypt SQLite database in C#
  28. C# Searching for files and folders except in certain folders
  29. c# open file, path starting with %userprofile%
  30. Why does System.IO.File.Exists(string path) return false?

Leave a Comment