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Home Interviews What is the use of BufferedStream in file handling? – MindStick
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1 Answers

ICSM Computer
ICSM Computer 06 May 2025
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BufferedStream in C# is used to improve performance during file I/O by adding a buffer between the stream and the file. It reduces the number of direct disk access operations by temporarily storing data in memory.

Why use BufferedStream?

  • Minimizes expensive disk I/O operations by batching small reads/writes into fewer large ones.
  • Improves performance especially when you're performing many small read/write operations.
  • Useful when wrapping slower streams like FileStream.

Typical Use Case

using System;
using System.IO;

class Program
{
    static void Main()
    {
        string path = "largefile.dat";

        using (FileStream fileStream = new FileStream(path, FileMode.OpenOrCreate, FileAccess.ReadWrite))
        using (BufferedStream bufferedStream = new BufferedStream(fileStream))
        {
            byte[] data = System.Text.Encoding.UTF8.GetBytes("Buffered I/O Example");
            bufferedStream.Write(data, 0, data.Length);

            // You must flush to ensure data is written to the file
            bufferedStream.Flush();
        }
    }
}

Key Points

  1. BufferedStream doesn't replace FileStream—it wraps it.
  2. It’s most useful when doing frequent, small reads/writes.
  3. Remember to call Flush() or close the stream to ensure data is written.
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