C#字节数组比较 [英] C# byte array comparison

问题描述

我在 C# 中有两个字节数组，使用 .NET 3.0.

I have two byte arrays in C# using .NET 3.0.

比较两个字节数组每个元素是否包含相同内容的最有效"方法是什么?

What is the "most efficient" way to compare whether the two byte arrays contains the same content for each element?

例如，字节数组 {0x1, 0x2} 与 {0x1, 0x2} 相同.但是字节数组{0x1, 0x2}和字节数组{0x2, 0x1}是不一样的.

For example, byte array {0x1, 0x2} is the same as {0x1, 0x2}. But byte array {0x1, 0x2} and byte array {0x2, 0x1} are not the same.

推荐答案

好吧，你可以使用:

public static bool ByteArraysEqual(byte[] b1, byte[] b2)
{
    if (b1 == b2) return true;
    if (b1 == null || b2 == null) return false;
    if (b1.Length != b2.Length) return false;
    for (int i=0; i < b1.Length; i++)
    {
        if (b1[i] != b2[i]) return false;
    }
    return true;
}

(我通常对所有东西都使用大括号，但我想我会尝试这种布局样式只是为了改变...)

(I normally use braces for everything, but I thought I'd experiment with this layout style just for a change...)

这有一些 SequenceEqual 不能(或不)执行的优化 - 例如预先长度检查.直接数组访问也会比使用枚举器更有效.

This has a few optimisations which SequenceEqual can't (or doesn't) perform - such as the up-front length check. Direct array access will also be a bit more efficient than using the enumerator.

诚然，在大多数情况下不太可能产生显着差异......

Admittedly it's unlikely to make a significant difference in most cases...

您可以可能通过一次比较 32 位或 64 位而不是 8 位来使其在非托管代码中更快 - 但我不想即时编码.

You could possibly make it faster in unmanaged code by making it compare 32 or 64 bits at a time instead of 8 - but I wouldn't like to code that on the fly.

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