转换列表 <byte[]> 到一个字节[]数组

Question

如何在一个byte[]数组或一个Stream转换List<byte[]> ？

Answer 1

SelectMany should do the trick:

var listOfArrays = new List<byte[]>();

byte[] array = listOfArrays
                .SelectMany(a => a)
                .ToArray();

Answer 2

var myList = new List<byte>();
var myArray = myList.ToArray();

EDIT: OK, turns out the question was actually about List<byte[]> - in which case you need to use SelectMany to flatten a sequence of sequences into a single sequence.

var listOfArrays = new List<byte[]>();
var flattenedList = listOfArrays.SelectMany(bytes => bytes);
var byteArray = flattenedList.ToArray();

Docs at http://msdn.microsoft.com/en-us/library/system.linq.enumerable.selectmany.aspx

Answer 3

您可以使用List <T> .ToArray（） 。

Answer 4

This is probably a little sloppy, could use some optimizing, but you get the gist of it

var buffers = new List<byte[]>();    
int totalLength = buffers.Sum<byte[]>( buffer => buffer.Length );    
byte[] fullBuffer = new byte[totalLength];

int insertPosition = 0;
foreach( byte[] buffer in buffers )
{
    buffer.CopyTo( fullBuffer, insertPosition );
    insertPosition += buffer.Length;
}

Answer 5

If you're using the actual class System.Collections.Generic.List<byte> , call ToArray(). It returns a new byte[] .