MewtocolNet/MewtocolNet/Extensions/SerialPortExtensions.cs

using System;
using System.IO.Ports;
using System.Threading.Tasks;

namespace MewtocolNet {

    internal static class SerialPortExtensions {

        public async static Task WriteAsync(this SerialPort serialPort, byte[] buffer, int offset, int count) {

            await serialPort.BaseStream.WriteAsync(buffer, 0, buffer.Length);

        }

        public async static Task ReadAsync(this SerialPort serialPort, byte[] buffer, int offset, int count) {
            var bytesToRead = count;
            var temp = new byte[count];

            while (bytesToRead > 0) {
                var readBytes = await serialPort.BaseStream.ReadAsync(temp, 0, bytesToRead);
                Array.Copy(temp, 0, buffer, offset + count - bytesToRead, readBytes);
                bytesToRead -= readBytes;
            }
        }

        public async static Task<byte[]> ReadAsync(this SerialPort serialPort, int count) {
            var buffer = new byte[count];
            await serialPort.ReadAsync(buffer, 0, count);
            return buffer;
        }

    }

}