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Home Interviews How can you track progress while copying a large file? – MindStick
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1 Answers

ICSM Computer
ICSM Computer 14 May 2025
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To track progress while copying a large file in C#, you can read and write the file in chunks (buffers) and calculate the percentage based on how much you've read vs the total file size.

Sample Code: File Copy with Progress Tracking

using System;
using System.IO;

public class FileCopyWithProgress
{
    public static void CopyFileWithProgress(string sourcePath, string destinationPath)
    {
        const int bufferSize = 1024 * 1024; // 1 MB buffer
        byte[] buffer = new byte[bufferSize];
        long totalBytesRead = 0;

        FileInfo sourceInfo = new FileInfo(sourcePath);
        long totalSize = sourceInfo.Length;

        using (FileStream sourceStream = File.OpenRead(sourcePath))
        using (FileStream destStream = File.Create(destinationPath))
        {
            int bytesRead;
            while ((bytesRead = sourceStream.Read(buffer, 0, buffer.Length)) > 0)
            {
                destStream.Write(buffer, 0, bytesRead);
                totalBytesRead += bytesRead;

                // Progress calculation
                double percent = (double)totalBytesRead / totalSize * 100;
                Console.WriteLine($"Progress: {percent:F2}%");
            }
        }

        Console.WriteLine("Copy completed.");
    }
}

Usage:

FileCopyWithProgress.CopyFileWithProgress("largefile.iso", "copy.iso");

Tips:

  1. Use a larger buffer (e.g., 1 MB) for better performance.
  2. For UI apps, report progress to a ProgressBar or use IProgress<double>.
  3. For async support, use ReadAsync/WriteAsync instead.
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