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Home Forums What is the difference between FileStream and MemoryStream? – MindStick
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1 Answers

ICSM Computer
ICSM Computer 01 Jun 2025
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FileStream and MemoryStream are both part of the .NET System.IO namespace, and while they both inherit from Stream, they serve very different purposes.

FileStream vs MemoryStream

Feature FileStream MemoryStream
Storage Medium Interacts with a file on disk Uses memory (RAM) as the data store
Performance Slower (disk I/O latency) Faster (memory access)
Persistence Persistent (data remains after app closes) Volatile (data lost when app exits or disposed)
Use Cases Reading/writing files, file-based logs, etc. In-memory data processing, temp buffers, etc.
Constructors Requires file path or handle Uses byte arrays or default in-memory buffer
Requires Cleanup Yes — can lock file until disposed Yes — disposes RAM used by buffer

Examples

FileStream Example (write to disk):

using (var fs = new FileStream("data.txt", FileMode.Create, FileAccess.Write))
{
    byte[] data = Encoding.UTF8.GetBytes("Hello, FileStream!");
    fs.Write(data, 0, data.Length);
}

MemoryStream Example (write to memory):

using (var ms = new MemoryStream())
{
    byte[] data = Encoding.UTF8.GetBytes("Hello, MemoryStream!");
    ms.Write(data, 0, data.Length);

    // Reset and read back
    ms.Position = 0;
    var reader = new StreamReader(ms);
    string text = reader.ReadToEnd();
}

When to Use

Use FileStream when:

  • You need to read/write actual files
  • You want persistent storage
  • You're working with large files that don’t fit into memory

Use MemoryStream when:

  • You want fast, temporary in-memory processing
  • You're working with byte arrays, serialization, or image manipulation
  • You want to avoid disk I/O for performance
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