在C#中将int []转换为byte []

问题描述：

我知道如何做到这一点:通过创建必要大小的字节数组，并使用for循环来转换int数组中的每个元素.

I know how to do this the long way: by creating a byte array of the necessary size and using a for-loop to cast every element from the int array.

我想知道是否有更快的方法，因为如果int大于sbyte，上述方法似乎会中断.

I was wondering if there was a faster way, as it seems that the method above would break if the int was bigger than an sbyte.

答

如果要按位复制，即从一个int中获取4个字节，请使用

If you want a bitwise copy, i.e. get 4 bytes out of one int, then use Buffer.BlockCopy:

byte[] result = new byte[intArray.Length * sizeof(int)];
Buffer.BlockCopy(intArray, 0, result, 0, result.Length);

请勿使用 Array.Copy ，因为它会尝试进行转换，而不仅仅是复制.有关更多信息，请参见MSDN页面上的注释.

Don't use Array.Copy, because it will try to convert and not just copy. See the remarks on the MSDN page for more info.