在 C# 中将大文件读入字节数组的最佳方法? [英] Best way to read a large file into a byte array in C#?

问题描述

我有一个网络服务器，可以将大型二进制文件(几兆字节)读入字节数组.服务器可能同时读取多个文件(不同的页面请求)，因此我正在寻找最优化的方法来执行此操作，而不会对 CPU 造成过多负担.下面的代码够好吗?

I have a web server which will read large binary files (several megabytes) into byte arrays. The server could be reading several files at the same time (different page requests), so I am looking for the most optimized way for doing this without taxing the CPU too much. Is the code below good enough?

public byte[] FileToByteArray(string fileName)
{
    byte[] buff = null;
    FileStream fs = new FileStream(fileName, 
                                   FileMode.Open, 
                                   FileAccess.Read);
    BinaryReader br = new BinaryReader(fs);
    long numBytes = new FileInfo(fileName).Length;
    buff = br.ReadBytes((int) numBytes);
    return buff;
}

推荐答案

只需将整个内容替换为:

Simply replace the whole thing with:

return File.ReadAllBytes(fileName);

但是，如果您担心内存消耗，则不应该一次将整个文件读入内存.你应该分块做.

However, if you are concerned about the memory consumption, you should not read the whole file into memory all at once at all. You should do that in chunks.

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