Java和C#-字节数组到长转换的区别 [英] Java and C# - byte array to long conversion difference

问题描述

这对我来说很奇怪: 当我在Java中运行时

This is strange to me: when I run in Java

byte[] data = new byte[] { 50, -106, 40, -22, -94, -119, -52, 8 };
ByteBuffer bb = ByteBuffer.wrap( data );
System.out.println( bb.getLong() );

结果是3645145936617393160

result is 3645145936617393160

当我在C#中运行

//unsigned values (signed&0xff)
byte[] bytes = new byte[] { 50, 150, 40, 234, 162, 137, 204, 8 };
long l = BitConverter.ToInt64(bytes, 0);
System.Console.Write(String.Format("{0}\n", l));
System.Console.ReadKey();

结果是634032980358633010

result is 634032980358633010

您能帮我理解吗?
谢谢！

Can you help me to understand this?
Thanks!

推荐答案

这与 endianness .

如果反转字节数组，它将按预期工作:

If you reverse the byte array, it works as expected:

BitConverter.ToInt64(new byte[] { 8, 204, 137, 162, 234, 40, 150, 50 }, 0)

您可以通过调用

You can set the endianness in Java by calling bb.order(ByteOrder.LITTLE_ENDIAN).

顺便说一句，最简单的方法是使用 LINQPad .

By the way, the easiest way to play with these things is to use LINQPad.

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