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Home Interviews How to log an user activity in C# using file handling? – MindStick
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1 Answers

ICSM Computer
ICSM Computer 29 May 2025
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To maintain user activity logs saved as separate files per day, you can easily modify the async logger to create a new log file for each date.

Updated: Async Logger with Day-Wise Log Files

public static class UserActivityLogger
{
    public static async Task LogAsync(string userId, string userName, string action, string description, string ipAddress = null)
    {
        try
        {
            // Format: UserActivityLog_2025-05-29.txt
            string logFileName = $"UserActivityLog_{DateTime.UtcNow:yyyy-MM-dd}.txt";
            string logDirectory = HttpContext.Current.Server.MapPath("~/App_Data/UserLogs");

            if (!Directory.Exists(logDirectory))
                Directory.CreateDirectory(logDirectory);

            string logFilePath = Path.Combine(logDirectory, logFileName);

            string logMessage = $"{DateTime.UtcNow:yyyy-MM-dd HH:mm:ss} | UserID: {userId} | UserName: {userName} | Action: {action} | IP: {ipAddress} | Description: {description}{Environment.NewLine}";
            byte[] encodedText = Encoding.UTF8.GetBytes(logMessage);

            using (var stream = new FileStream(logFilePath, FileMode.Append, FileAccess.Write, FileShare.ReadWrite, 4096, useAsync: true))
            {
                await stream.WriteAsync(encodedText, 0, encodedText.Length);
            }
        }
        catch
        {
            // Do not throw from logger
        }
    }
}

Sample Output Location

Your logs will be stored like this:

App_Data/UserLogs/
├── UserActivityLog_2025-05-28.txt
├── UserActivityLog_2025-05-29.txt
├── UserActivityLog_2025-05-30.txt

Usage in Controller (same as before)

await UserActivityLogger.LogAsync(
    userId: User.Identity.GetUserId(),
    userName: User.Identity.Name,
    action: "Login",
    description: "User successfully logged in",
    ipAddress: Request.UserHostAddress
);

Optional Enhancements

Would you like to:

  • Compress old log files (e.g., ZIP after 7 days)?
  • Automatically delete logs older than X days?
  • Use JSON format instead of plain text?
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