Question

我创建了从串口读取的应用程序，它工作得很好。但是当我关闭应用程序并再次运行它时会出现问题。突然从串口读取停止工作。我必须断开连接并连接USB才能修复它。

这是我的代码：

namespace Serial
{
    public partial class Main : Form
    {
        SerialPort mainSerialPort = new SerialPort();

        public Main()
        {
            InitializeComponent();
        }

        delegate void SetTextCallback(string text);

        private void buttonOpen_Click(object sender, EventArgs e)
        {

            mainSerialPort.PortName = "COM" + numericPort.Value.ToString();
            mainSerialPort.BaudRate = 115200;
            mainSerialPort.Parity = Parity.None;
            mainSerialPort.StopBits = StopBits.One;
            mainSerialPort.DataBits = 8;
            mainSerialPort.Handshake = Handshake.None;
            mainSerialPort.DataReceived += DataReceived_Read;

            try{
                mainSerialPort.Open();
            }catch (Exception ex){
                labelStatus.Text = ex.GetType().ToString();
            }


            if (mainSerialPort.IsOpen == true){
                numericPort.BackColor = Color.Green;
                labelStatus.Text = "Port je otevřen!";
            }else{
                numericPort.BackColor = Color.Red;
            }

        }

        private void DataReceived_Read(object sender, SerialDataReceivedEventArgs e)
        {
            SerialPort mySerial = (SerialPort)sender;

            if (this.InvokeRequired){
                listBoxRead.Invoke(new MethodInvoker(delegate {
                    listBoxRead.Items.Add(mySerial.ReadExisting());
                    listBoxRead.SelectedIndex = listBoxRead.Items.Count - 1;
                }));
            }

        }

        private void Main_FormClosed(object sender, FormClosedEventArgs e)
        {
            mainSerialPort.DataReceived -= DataReceived_Read;
            mainSerialPort.Close();
        }
    }
}

Answer 1

USB和串行端口是非托管资源。你必须处理它！ FormClosed上的一个简单的“已关闭”将不会这样做。

Answer 2

我认为这与一些未正确释放的资源有关。尝试调用Dispose方法

mainSerialPort.Close();
mainSerialPort.Dispose();

从SerialPort读取;关闭然后打开应用程序时出错

2 个答案: