从字节数组中获取最后一个字节

Question

I need to read last 8 bytes from byte array. Right now im doing it like this:

last8 = data.Reverse().Take(8).Reverse();

Is there any better way of doing this?

Answer 1

Use Array.Copy for example:

byte[] data = ...;
byte[] last8 = new byte[8];
Array.Copy(data, data.Length-8, last8, 0, 8);

Answer 2

What about this:

var last8 = data.Skip(data.Length - 8);

Would save the step of reversing an array twice.

Answer 3

您还可以使用data.Skip(data.Count - 8) （如果您的数据已经被枚举 - 例如一个Array或List ）。

Answer 4

C# 8 has a new feature that might help ...

var myByteArray = new byte[] {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A };
byte[] last8 = mydata[^8..];   //      => 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A

In the above, we start at "8 from the end" then go to the end.