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");
            }

    }

///

/// 读取和写入 ///

/// /// private void btn5xy_Click(object sender, EventArgs e) { if (FxSerial.IsOpen() == true) { OperateResult 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”