是MemoryStream比FileStream快吗?

问题描述

我正在读取一个二进制文件，并且需要太多的指针移动.我知道MS比FS快得多.但是我正在做的是，首先读取所有字节以进行缓存，然后使用MS.那有什么不同吗?还是我应该直接阅读文件?

像这样的东西

I''m reading a binary file and need too many pointer movements. And I know MS is much faster than FS. But what I''m doing is that, first I read all bytes to cache then use MS. So will it make any difference or I should directly read the file ?

something like this

byte[] data = File.ReadAllBytes(path);
MemoryStream ms = new MemoryStream(data);
BinaryReader br = new BinaryReader(ms);

或

or

BinaryReader br = new BinaryReader(File.OpenRead(path));

创建BinaryReader之后，我必须做数千个指针移动，例如

Edited :

after creating BinaryReader I have to do thousands of pointers movements like

br.BaseStream.Position = 99999;
br.BaseStream.Position = 2;
br.BaseStream.Position = 86765;

推荐答案

   System.Diagnostics.Stopwatch sw = new System.Diagnostics.Stopwatch();
   sw.Start();
   string path = @"D:\american.gxt";
   byte[] data = File.ReadAllBytes(path);
   MemoryStream ms = new MemoryStream(data);
   BinaryReader br = new BinaryReader(ms);
// BinaryReader br = new BinaryReader(File.OpenRead(path)); //uncomment this line for II method


   Random r = new Random();
   int length = (int)br.BaseStream.Length;

   for (int a = 0; a < 10000; a++)
   {
       br.BaseStream.Position = r.Next(0, length);
   }
   sw.Stop();

   richTextBox1.AppendText(sw.Elapsed.ToString()+"\r\n");

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