Question

我正在为串口做一个项目..

我需要从组合框中选择可用的com端口。

但我无法得到它......我需要一些帮助〜

这是我的代码..它在C＃中：

btn_Open是一个激活串口的按钮

    private void btnOpen_Click(object sender, EventArgs e)
    {
        string [] myPort;

        int COM1 = cbCommPorts.SelectedIndex;
        int COM2 = cbCommPorts.SelectedIndex;
        int COM3 = cbCommPorts.SelectedIndex;
        Object selectedItem = serialPort1.PortName;

        myPort = System.IO.Ports.SerialPort.GetPortNames();
        cbCommPorts.Items.AddRange(myPort);

        serialPort1.PortName = cbCommPorts.SelectedItem.ToString();
        serialPort1.BaudRate = 115200;

        if (serialPort1.IsOpen) {
            serialPort1.PortName = cbCommPorts.SelectedItem.ToString();

            serialPort1.Open();
            btnTransmit.Enabled = true;
            btn2.Enabled = true;
            btn3.Enabled = true;
        }

cbCommPorts是我为组合框命名的名字

private void cbCommPorts_SelectedIndexChanged（object sender，EventArgs e） { int COM1 = cbCommPorts.SelectedIndex; int COM2 = cbCommPorts.SelectedIndex; int COM3 = cbCommPorts.SelectedIndex; Object selectedItem = serialPort1.PortName;
```
    MessageBox.Show("COM PORT: " + selectedItem.ToString() + " Selected");
}
```

我的代码有问题吗？感谢..

Answer 1

这是您在Windows窗体中使用它的一种方法

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        this.Load += Form1_Load;
    }

    void Form1_Load(object sender, EventArgs e)
    {
        var ports = SerialPort.GetPortNames();
        cmbSerialPorts.DataSource = ports;
    }

    private void btnOk_Click(object sender, EventArgs e)
    {
        if (cmbSerialPorts.SelectedIndex > -1)
        {
            MessageBox.Show(String.Format("You selected port '{0}'", cmbSerialPorts.SelectedItem));
            Connect(cmbSerialPorts.SelectedItem.ToString());
        }
        else
        {
            MessageBox.Show("Please select a port first");
        }
    }

    private void Connect(string portName)
    {
        var port = new SerialPort(portName);
        if (!port.IsOpen)
        {
            port.BaudRate = 19200;
            port.Open();
            //Continue here....
        }
    }
}

话虽如此，除非您维护旧版软件，看看WPF可能是个好主意。学习如何使用WPF而不是WinForms 准备好在Windows 8，Windows Phone等上进行开发......数据绑定功能使你想要做的事情变得非常简单。

Answer 2

WPF代码样式

public void comboBox_DropDownOpened(object sender, EventArgs e)
    {   
        string[] ports = SerialPort.GetPortNames();          
        foreach ( string comport in ports)
            {
                comboBox.Items.Add(comport);
            }
    }
.... /*Two control item combobox&button, comboxbox's item is COM port and   It's first argument of Function 「System.IO.Ports.SerialPort 」. Using (comboBox.text) */
private void button1_Click(object sender, RoutedEventArgs e)
    {

        System.IO.Ports.SerialPort Port = new SerialPort
            ((comboBox.Text), 115200, Parity.None, 8, StopBits.One);
        try
        {
            Port.Open();
            Port.Write(cmdByteArray, 0, cmdByteArray.Length );
        }
        catch { Exception ex; }
        Port.Read(readbyte, 0, readbyte.Length);

Answer 3

private void comboBox_DropDownOpened(object sender, EventArgs e)
{
    string[] ports = SerialPort.GetPortNames();
    comboBox.Items.Clear();
    foreach (string comport in ports)
    {
        comboBox.Items.Add(comport);
    }
}

除了 ysjia 帖子。

如果你不添加.Clear（）;每次点击它都会进一步扩展。你会有重复的。

串口组合框

3 个答案: