How can you track progress while copying a large file?

Question

ICSM Computer · Answer

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)) andgt; 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:
Use a larger buffer (e.g., 1 MB) for better performance.For UI apps, report progress to a ProgressBar or use
IProgressandlt;doubleandgt;.For async support, use ReadAsync/WriteAsync instead.

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How can you track progress while copying a large file?

ICSM Computer

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1 Answers

Sample Code: File Copy with Progress Tracking

Usage:

Tips:

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