Convert array of Ints into array of Little-Endian Bytes in C#

Question

I need to convert a large array of ints into an array of their little endian byte representations. Is there a function that converts the array or is the only way to loop through and "manually" convert each one.

[`.Select`](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.select?view=net-6.0) — Nick is tired, Feb 18 '22 at 16:25
Please show an example of what your input is and what your expected output is. And also show what you have already tried — derpirscher, Feb 18 '22 at 16:26
Does this answer your question? [How to convert an int to a little endian byte array?](https://stackoverflow.com/questions/2350099/how-to-convert-an-int-to-a-little-endian-byte-array) — Peter Smith, Feb 18 '22 at 16:26
Whether you use a loop or `linq` at some level you have to loop through your array — Peter Smith, Feb 18 '22 at 16:27
Are you running this on a little-endian machine, or must the solution be endian-agnostic? — Matthew Watson, Feb 18 '22 at 16:32
Note that `BinaryPrimitives` was added since that linked answer was written — canton7, Feb 18 '22 at 16:34

Ocean Airdrop · Accepted Answer · 2022-02-19T18:33:57.290

One thing you could do is use the EndianBitConverter project from Nuget. It does what it says on the tin and provides a way of converting to either big-endian or little-endian.

Once you have got it installed, you can write code like this:

var intList = new List<int> { 91233, 67278, 22345, 45454, 23449 };
            
foreach ( var n in intList)
{
    var result1 = EndianBitConverter.LittleEndian.GetBytes(n);
    var result2 = EndianBitConverter.BigEndian.GetBytes(n);
}

If you want to do it as a 1 liner, then perhaps something like this:

var intList = new List<int> { 91233, 67278, 22345, 45454, 23449 };
var result = intList.Select(x => EndianBitConverter.LittleEndian.GetBytes(x)).ToList();

Convert array of Ints into array of Little-Endian Bytes in C#

1 Answers1