BitConverter.GetBytes in place

Question

I need to get values in UInt16 and UInt64 as Byte[]. At the moment I am using BitConverter.GetBytes, but this method give

Answer 1

BinaryWriter can be a good solution.

var writer = new BinaryWriter(new MemoryStream(yourbuffer, youroffset, yourbuffer.Length-youroffset));
writer.Write(someuint64);

It's useful when you need to convert a lot of data into a buffer continuously

var writer = new BinaryWriter(new MemoryStream(yourbuffer));
foreach(var value in yourints){
    writer.Write(value);
}

or when you just want to write to a file, that's the best case to use BinaryWriter.

var writer = new BinaryWriter(yourFileStream);
foreach(var value in yourints){
    writer.Write(value);
}