新手小白，报错System.ObjectDisposedException:“已关闭 Safe handle”

[99tian]

 private void opencomplc()//打开接口
        {
            try
            {
                if (ccbcom1.Text == "")
                {
                    MessageBox.Show("Select Port Settings First");
                }
                else
                {
                    FxSerial.SerialPortInni(spplc =>
                        {
                            serialPortEncoding = Encoding.GetEncoding("iso-8859-1");
                            spplc.Encoding = serialPortEncoding;
                            spplc.RtsEnable = true;
                            spplc.PortName = ccbcom1.Text;
                            spplc.BaudRate = Convert.ToInt32(cbbrate1.Text);
                            spplc.Parity = (Parity)Enum.Parse(typeof(Parity), "2");
                            //spplc.Parity = System.IO.Ports.Parity.Even;
                            spplc.DataBits = 7;
                            spplc.StopBits = (StopBits)Enum.Parse(typeof(StopBits), "1");
                            //spplc.StopBits = System.IO.Ports.StopBits.One;
                            spplc.Handshake = (Handshake)Enum.Parse(typeof(Handshake), "None");
                            spplc.ReadTimeout = 100;
                            spplc.WriteTimeout = 200;
                        });
                    try
                    {
                        OperateResult connect = FxSerial.Open();
                        if (connect.IsSuccess)
                        {
                            // 串口打开成功
                            Console.WriteLine("Open success");
                        }
                        else
                        {
                            // 串口打开失败，输出原因，可能串口不存在，或是已经被其他程序打开了
                            Console.WriteLine("Open failed:" + connect.Message);
                        }
                        //FxSerial.Open();
                        timer.Start();
                        lbck1.Color = Color.Lime;
                        //MessageBox.Show("串口打开！");
                        if (cbAutoCon1.Checked)
                        {
                            Properties.Settings.Default.PlcPort = "0";
                            Properties.Settings.Default.Save();
                        }
                        
                    }
                    catch (Exception ex)
                    {

                        MessageBox.Show(ex.Message);
                    }
                }
            }
            catch (Exception ex) { MessageBox.Show(ex.Message, "Message ", MessageBoxButtons.OK, MessageBoxIcon.Error); }
        }
```
      ```
  private void Closecomplc()//关闭接口
        {
                try
                {
                  
                    FxSerial.Close();
                    FxSerial.Dispose();
                    timer.Stop();
                    lbck1.Color = System.Drawing.Color.Gray;
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message, "message");
                }
            
        }
```
 ```
 /// <summary>
        /// 读取和写入
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btn5xy_Click(object sender, EventArgs e)
        {
            if (FxSerial.IsOpen() == true)
            {
                OperateResult<bool> R_X1 = FxSerial.ReadBool("Y002");
                if (R_X1.IsSuccess)
                {
                    // success
                    bool value = R_X1.Content;
                    if (value == false)
                    {
                        OperateResult write = FxSerial.Write("M2", true);

                        if (write.IsSuccess)
                        {
                            //MessageBox.Show(write.IsSuccess.ToString());
                            OperateResult wrie = FxSerial.Write("M2", false);
                        }
                    }
                    else
                    {
                        MessageBox.Show("未停止增压");
                    }
                }
                else
                {
                    // failed
                    MessageBox.Show("Read failed: " + R_X1.ToMessageShowString());
                }
            }
        }

```
点击打开串口再关闭，再打开串口，

读取或者写入就报错System.ObjectDisposedException:“已关闭 Safe handle”