读取大文件到C＃中的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Web服务器将读取大型二进制文件（几兆字节）成字节数组。该服务器可以读取多个文件在​​同一时间（不同的页面请求），所以我在寻找最优化的方式这样做，而不耗费CPU的太多了。低于code不够好？

 公共字节[] FileToByteArray（字符串文件名）
{
    byte []的BUFF = NULL;
    的FileStream FS =新的FileStream（文件名，
                                   FileMode.Open，
                                   FileAccess.Read）;
    BR BinaryReader在新= BinaryReader在（FS）;
    长的numBytes =新的FileInfo（文件名）.Length;
    BUFF = br.ReadBytes（（INT）的numBytes）;
    返回的buff;
}
 

解决方案

简单地替换了整个事情：

 返回File.ReadAllBytes（文件名）;
 

不过，如果您担心内存消耗，你应该的没有的读取整个文件到内存中一次全部所有。你应该这样做，在块。

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;
}

解决方案

Simply replace the whole thing with:

return File.ReadAllBytes(fileName);

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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