How to merge file with different extensions in C#

Question

Merging Files having different extensions into one given file with .mrg extension

Answer 1

Hi @yashrajsinh gohil ，Welcome to Microsoft Q&A,

What you are looking for is pretty much what Mamu Cacga said.

Using FileStream, for each extension, the program loops through the list of files found. For each file, it uses FileStream** to open the file and copies its contents into the merged file, using the CopyTo method.

Once all files have been merged into a single file, the using statement ensures that all open file streams are properly closed and resources released.

The extension of the merged file is hard-coded in the variable, so you will need to try it yourself for the files generated by this method.

using System;
using System.IO;

class Program
{
     static void Main()
     {
         //Set the folder path to be merged
         string folderPath = @"C:\Path\To\Your\Folder";

         //Set the extension of the files to be merged
         string[] fileExtensions = { ".txt", ".doc", ".pdf" }; // Add more extensions as needed

         //Set the path of the merged file to be generated
         string mergedFilePath = @"C:\Path\To\Your\Folder\merged.mrg";

         // merge files
         MergeFiles(folderPath, fileExtensions, mergedFilePath);

         Console.WriteLine("Files successfully merged!");
     }

     static void MergeFiles(string folderPath, string[] fileExtensions, string mergedFilePath)
     {
         //Create new merged file
         using (FileStream mergedFileStream = new FileStream(mergedFilePath, FileMode.Create))
         {
             foreach (string fileExtension in fileExtensions)
             {
                 // Get all files with the current extension
                 string[] files = Directory.GetFiles(folderPath, "*" + fileExtension);

                 foreach (string file in files)
                 {
                     // Open the current file and write its contents to the merged file
                     using (FileStream fileStream = new FileStream(file, FileMode.Open))
                     {
                         fileStream.CopyTo(mergedFileStream);
                     }
                 }
             }
         }
     }
}

Best Regards,

Jiale

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Answer 2

Note: if the files are not the same format, the merged file may be unreadable.