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Home Interviews How do you implement retry logic when reading a file that may be temporarily unavailable? – MindStick
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1 Answers

ICSM Computer
ICSM Computer 15 May 2025
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To implement retry logic when reading a file that may be temporarily unavailable (e.g., locked by another process), you can use a try-catch loop with delays and retry limits.

Example: Retry File Read with Delay

using System;
using System.IO;
using System.Threading;

class FileReadWithRetry
{
    public static string ReadFileWithRetries(string filePath, int maxRetries = 5, int delayMs = 1000)
    {
        int attempt = 0;

        while (true)
        {
            try
            {
                // Attempt to read the file
                using (FileStream stream = new FileStream(
                    filePath,
                    FileMode.Open,
                    FileAccess.Read,
                    FileShare.Read)) // Adjust sharing mode as needed
                using (StreamReader reader = new StreamReader(stream))
                {
                    return reader.ReadToEnd();
                }
            }
            catch (IOException ex)
            {
                attempt++;

                if (attempt >= maxRetries)
                    throw new IOException($"Failed to read file after {maxRetries} attempts.", ex);

                Console.WriteLine($"File is unavailable (attempt {attempt}), retrying in {delayMs} ms...");
                Thread.Sleep(delayMs);
            }
        }
    }
}

Usage

try
{
    string content = FileReadWithRetry.ReadFileWithRetries("data.txt");
    Console.WriteLine("File read successfully.");
}
catch (IOException ex)
{
    Console.WriteLine("Failed to read file: " + ex.Message);
}

Parameters You Can Tune

  1. maxRetries: How many times to retry.
  2. delayMs: Milliseconds to wait between attempts.
  3. Adjust FileShare.Read to FileShare.None if you need exclusive access.

Best Practices

  1. Avoid tight retry loops — use a delay.
  2. Log each retry or failure for diagnostics.
  3. In async apps, consider using Task.Delay() with async/await instead of Thread.Sleep.

Read More

  1. How do you create a temporary file in C#?
  2. What is the use of BufferedStream in file handling?
  3. How do you read a large file efficiently without loading the entire content into memory?
  4. How do you handle exceptions when working with files in C#?
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