整数到字节数组 [英] Int to byte array

问题描述

我认为 .net 有某种简单的转换方法可用于将 int 转换为字节数组?我进行了快速搜索，所有解决方案都是位掩码/一次移动一个字节，例如美好的时光".某处没有 ToByteArray() 方法吗?

I thought .net had some kind of easy conversion method to use for converting an int into a byte array? I did a quick search and all solutions are bit masking/shifting one byte at a time, like "the good ol days". Is there not a ToByteArray() method somewhere?

推荐答案

2020 年更新 - BinaryPrimitives 现在应该优先于 BitConverter.它提供特定于字节序的 API，并且分配更少.

Update for 2020 - BinaryPrimitives should now be preferred over BitConverter. It provides endian-specific APIs, and is less allocatey.

byte[] bytes = BitConverter.GetBytes(i);

尽管还要注意，您可能想要检查 BitConverter.IsLittleEndian 以查看会出现哪种方式！

although note also that you might want to check BitConverter.IsLittleEndian to see which way around that is going to appear!

请注意，如果您重复这样做，您可能希望通过任一移位操作(>>/<<)，或使用 unsafe 代码.Shift 操作还具有不受平台字节序影响的优点；你总是按照你期望的顺序获得字节.

Note that if you are doing this repeatedly you might want to avoid all those short-lived array allocations by writing it yourself via either shift operations (>> / <<), or by using unsafe code. Shift operations also have the advantage that they aren't affected by your platform's endianness; you always get the bytes in the order you expect them.

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