C# dotnet 在内存中的 double 的 NAN 和正负无穷二进制是如何存

        static void Main(string[] args)
        {
            MemoryStream stream = new MemoryStream();
            BinaryWriter writer = new BinaryWriter(stream);

            double db = double.NaN;
            writer.Write(db);

            Console.WriteLine(string.Join(",", stream.ToArray().Select(b => b.ToString("X2"))));

            stream.Seek(0, SeekOrigin.Begin);
            db = double.PositiveInfinity;
            writer.Write(db);
            Console.WriteLine(string.Join(",", stream.ToArray().Select(b => b.ToString("X2"))));

            stream.Seek(0, SeekOrigin.Begin);
            db = double.NegativeInfinity;
            writer.Write(db);
            Console.WriteLine(string.Join(",", stream.ToArray().Select(b => b.ToString("X2"))));
        }

double d = double.NaN;
Span<byte> sp = new Span<byte>(&d, sizeof(double));