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Home Interviews How do you implement file versioning when saving edits to a document? – MindStick
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1 Answers

ICSM Computer
ICSM Computer 12 May 2025
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To implement file versioning when saving edits to a document in C#, you can save each new version of the file with a unique name or in a versioned folder. This avoids overwriting previous versions and allows rollback or audit history.

Basic Versioning Strategy

Option 1: Save with an incrementing version number

using System;
using System.IO;
using System.Linq;

class Program
{
    static void Main()
    {
        string baseFileName = "report";
        string directory = @"C:\Docs\";
        string extension = ".txt";
        string[] existingVersions = Directory
            .GetFiles(directory, $"{baseFileName}_v*{extension}");

        int nextVersion = existingVersions
            .Select(f => {
                var name = Path.GetFileNameWithoutExtension(f);
                var parts = name.Split("_v");
                return parts.Length == 2 && int.TryParse(parts[1], out int v) ? v : 0;
            })
            .DefaultIfEmpty(0)
            .Max() + 1;

        string newVersionPath = Path.Combine(directory, $"{baseFileName}_v{nextVersion}{extension}");

        File.WriteAllText(newVersionPath, "New version content");

        Console.WriteLine($"Saved: {newVersionPath}");
    }
}

Option 2: Save using timestamp-based names

string timestamp = DateTime.Now.ToString("yyyyMMdd_HHmmss");
string filePath = $@"C:\Docs\report_{timestamp}.txt";
File.WriteAllText(filePath, "Versioned content");

Advanced Ideas (Optional)

  1. Store a manifest file tracking version history.
  2. Add metadata (like username, edit reason) in a sidecar .json or in file comments.
  3. Keep a max of N versions (auto-delete old ones).
  4. Use a database or Git-like system for serious version control.

Summary:

Strategy Example Filename Notes
Incrementing numbers report_v3.txt Easy to read and manage
Timestamps report_20250513_153000.txt Avoids duplicates, reflects timing
Content hash/version ID report_ab12cd34.txt More advanced; useful for deduplication
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