LED客显的类

using System;
using System.IO.Ports;

namespace Common
{
    public class LedHelper
    {
        private static int _baudRate = ;
        private static string _portName = "COM2";
        /// <summary>
        /// 串型端口对象
        /// </summary>
        private static SerialPort _serialPort;
        /// <summary>
        /// 波特率
        /// </summary>
        public static int BaudRate
        {
            get { return _baudRate; }
            set { _baudRate = value; }
        }
        /// <summary>
        /// 端口
        /// </summary>
        public static string PortName
        {
            get { return _portName; }
            set { _portName = value; }
        }
        /// <summary>
        /// 清空屏幕
        /// </summary>
        public static void ScreenClean()
        {
            Open();

            Clear();

            Close();
        }
        /// <summary>
        /// 显示单价
        /// </summary>
        /// <param name="price"></param>
        public static void ShowUnitPrice(string price)
        {
            Open();
            UnitPrice(price);
            Close();
        }
        /// <summary>
        /// 显示应收
        /// </summary>
        /// <param name="money"></param>
        public static void ShowSum(string money)
        {
            Open();
            Sum(money);
            Close();
        }
        /// <summary>
        /// 显示实际收钱
        /// </summary>
        /// <param name="money"></param>
        public static void ShowRealMoney(string money)
        {
            Open();

            CollectMoney(money);
            Close();
        }
        /// <summary>
        /// 找零
        /// </summary>
        /// <param name="money"></param>
        public static void ShowOddChange(string money)
        {
            Open();
            OddChange(money);
            Close();
        }
        /// <summary>
        /// 全暗
        /// </summary>
        public static void ShowNone(string money)
        {
            Open();
            GetBlack(money);
            Close();
        }

        /// <summary>
        /// GetSum 总价
        /// </summary>
        /// <param name="value">The value.</param>
        private static void Sum(string value)
        {
            //clear();
            NewData(value);
            GetSum();
        }
        /// <summary>
        /// GetUnitPrice 单价
        /// </summary>
        /// <param name="value">The value.</param>
        private static void UnitPrice(string value)
        {
            //clear();
            NewData(value);

            GetUnitPrice();
        }
        /// <summary>
        /// GetCollectMoney 实收
        /// </summary>
        /// <param name="value">The value.</param>
        private static void CollectMoney(string value)
        {
            //clear();
            NewData(value);
            GetCollectMoney();
        }
        /// <summary>
        /// GetOddChange 找零
        /// </summary>
        /// <param name="value">The value.</param>
        private static void OddChange(string value)
        {
            //clear();
            NewData(value);
            GetOddChange();
        }
        /// <summary>
        /// 全黑
        /// </summary>
        /// <param name="value"></param>
        private static void GetBlack(string value)
        {
            //clear();
            NewData(value);
            AllBlack();
        }

        /// <summary>
        ///全暗.是找零 全价 GetCollectMoney 这几个灯
        /// </summary>
        private static void AllBlack()
        {
            // serialPort1.WriteLine(@"s0");
            _serialPort.Write(@"s0");
        }
        /// <summary>
        /// 清屏.
        /// </summary>
        private static void Clear()
        {
            //serialPort1.WriteLine("\f");
            _serialPort.Write(((char)()).ToString());
        }
        private static void GetUnitPrice()
        {
            //serialPort1.WriteLine(@"s1");//其实有数据的那个空格
            _serialPort.Write(@"s1");//其实有数据的那个空格
        }
        private static void GetSum()
        {
            _serialPort.WriteLine(@"s2");
        }
        private static void GetCollectMoney()
        {
            _serialPort.WriteLine(@"s3");
        }
        private static void GetOddChange()
        {
            _serialPort.WriteLine(@"s4");
        }
        private static void NewData(string data)
        {
            //serialPort1.WriteLine(@"QA" + data);
            _serialPort.Write(@"QA" + data + ((char)()).ToString());
        }
        /// <summary>
        /// 打开串口,可能抛出异常
        /// </summary>
        private static void Open()
        {
            try
            {
                if (_serialPort == null)
                {
                    _serialPort = new SerialPort();
                    _serialPort.PortName = _portName;
                    _serialPort.BaudRate = _baudRate;
                }
                if (!_serialPort.IsOpen)
                {
                    _serialPort.Open();
                }
            }
            catch (Exception ex)
            {
                throw new Exception("打开串口失败!错误信息为:" + ex.Message);
            }

        }
        /// <summary>
        /// 关闭串口
        /// </summary>
        private static void Close()
        {
            if (_serialPort != null && _serialPort.IsOpen)
                _serialPort.Close();
        }
    }
}