串口在每个窗体打开关闭容易出现访问被拒绝情况,这个时候只能重启电脑重置解决.

所以比较好的方式是使用母窗体打开串口,然后子窗体调用,不会出现上诉问题.

调用方法:

1.母窗体

//打开SerialPort即可

private void button2_Click(object sender, EventArgs e)

{

serialPort1.BaudRate = 9600;

serialPort1.Parity = System.IO.Ports.Parity.None;

serialPort1.PortName = "COM1";

serialPort1.Open();

}

//Show子窗体时候传入SerialPort

 private void btnFirstDiBang_Click(object sender, EventArgs e)

 {

            FrmDiBangFirstInput frm = new FrmDiBangFirstInput();

            frm._SerialPort = this.port;

            frm._UserInfo = this._UserInfo;

            frm.ShowDialog();

}

 

2.子窗体:

//把母窗体SerialPort传入

 public SerialPort _SerialPort

{

            get;

            set;

}

 

//使用委托传值

private delegate void UpdateTextEventHandler(string text);  //委托，，此为重点

private UpdateTextEventHandler updateText;

private void UpdateTextBox(string text)

{

      txtMaoZhong.Text = text;

}

 

//初始化时候绑定事件及实例化委托

this._SerialPort.DataReceived += new System.IO.Ports.SerialDataReceivedEventHandler(this.port_DataReceived);//SerialPort绑定事件

updateText = new UpdateTextEventHandler(UpdateTextBox);//实例化委托对象,用来给TextBox赋值

 

//接收数据方法

  private void port_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)

{

 

            byte[] readBuffer = new byte[_SerialPort.BytesToRead];

            _SerialPort.Read(readBuffer, 0, readBuffer.Length);

            string result = SerialPortProcess.GetBuffer(readBuffer).ToString();

 

            //ConstParam.DiBangRead = result;

 

            //

            this.Invoke(updateText, new string[] { ConstParam.DiBangRead });

}

SerialPort串口多个窗体访问