How to load entire stream into MemoryStream?

Question

Like in the topic: I want to read data from a file (from stream) into memory (memorystream) to improve my app speed. How to do it?

Answer 1

A few options:

Read it all into a byte array first...

byte[] data = File.ReadAllBytes(file); MemoryStream stream = new MemoryStream(data); 

Or use .NET 4's CopyTo method

MemoryStream memoryStream = new MemoryStream(); using (Stream input = File.OpenRead(file)) {     input.CopyTo(memoryStream); } memoryStream.Position = 0; 

Or do it manually

MemoryStream memoryStream = new MemoryStream(); using (Stream input = File.OpenRead(file)) {     byte[] buffer = new byte[32 * 1024]; // 32K buffer for example     int bytesRead;     while ((bytesRead = input.Read(buffer, 0, buffer.Length)) > 0)     {         memoryStream.Write(buffer, 0, bytesRead);     } } memoryStream.Position = 0; 

Answer 2

If you can hold the entire file in memory, File.ReadAllBytes should work for you:

using (var ms = new MemoryStream(File.ReadAllBytes(file))) {     // do work }