C# Convert ReadOnlyMemory to byte[]

You cannot drop a thing that’s read-only into a slot typed as byte[], because byte[]s are writable and that would defeat the purpose. It looks like RabbitMQ changed their API in February and perhaps forgot to update the sample code.

A quick workaround is to use .ToArray():

var body = ea.Body.ToArray();
var message = Encoding.UTF8.GetString(body);
Console.WriteLine(" [x] Received {0}", message);

Edit: Since this was accepted, I’ll amend it with the better solution posed by Dmitry and zenseb which is to use .Span:

var body = ea.Body.Span;
var message = Encoding.UTF8.GetString(body);
Console.WriteLine(" [x] Received {0}", message);