如何访问项目另一个文件中的串口变量？答案

【问题标题】：How to access Serial port variable in another file of the project?如何访问项目另一个文件中的串口变量？
【发布时间】：2022-06-13 16:33:46
【问题描述】：

我有一个 C# 项目，在我的 MainWindows.cs 中，我有一个创建函数，该函数通过 COM 端口设置串行通信。我想在同一个项目的另一个文件中访问这个变量，但我似乎做不到。 GUI 是一个使用 .NET 框架的 WPF 应用程序。

public void init() //function that creates the BT connection, it is in the MainWindows.cs
{
     SerialPort myPort = new SerialPort();
     myPort.PortName = "COM8";
     myPort.BaudRate = 9600;

     try
     {
          myPort.Open();
          myPort.WriteLine("Connected");
     }
     catch (Exception ex)
     {
          System.Windows.MessageBox.Show(ex.Message);
     }
}

这是我试图访问 myPort 变量的函数，但它不起作用。

private void running() // This function is in an another file, called Patient_list.cs, which has its own XAML file.
{
      string alert;
      alert = myPort.ReadLine(alert); //Error: The name "myPort" does not exist in the current context
      int to_int = Int32.Parse(alert);
      if (to_int == 2)
      {
            status.Text = "Level 2";
            status.Foreground = Brushes.Orange;
      }
}

【问题讨论】：

标签： c# wpf serial-port

【解决方案1】：

你必须使用类变量：

    private SerialPort _myPort;

    public void init() //function that creates the BT connection, it is in the MainWindows.cs
    {
        _myPort = new SerialPort();
        _myPort.PortName = "COM8";
        _myPort.BaudRate = 9600;

        try
        {
            _myPort.Open();
            _myPort.WriteLine("Connected");
        }
        catch (Exception ex)
        {
            System.Windows.MessageBox.Show(ex.Message);
        }
    }

    private void running() // This function is in an another file, called Patient_list.cs, which has its own XAML file.
    {
        string alert;
        alert = _myPort.ReadLine(alert); //Error: The name "myPort" does not exist in the current context
        int to_int = Int32.Parse(alert);
        if (to_int == 2)
        {
            status.Text = "Level 2";
            status.Foreground = Brushes.Orange;
        }
    }

【讨论】：