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，所有解决方案都是一次将位掩码/移位一个字节，例如好日子。
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 现在应优先于 BitConverter 。它提供了特定于字节序的API，并且分配较少。

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

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

尽管也请注意，您可能要检查 BitConverter.IsLittleEndian 看看将出现哪种方式！

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

请注意，如果您反复进行 ，您可能希望通过任何一次移位操作（>> / << ; ），或使用不安全代码。移位操作还的优点是不受平台的字节序影响；您总是按期望的顺序获取字节。

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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