Question

我试图在名为Modbus的类中为SerialPort.DataReceived设置自己的事件，我有一个Windows Form应用程序，希望在接收到数据时触发此事件。这是代码：

FROM oracle AS needs-squashing
ENV NEEDED_VAR some_value
COPY ./giant.zip ./somewhere/giant.zip
RUN echo "install giant in zip"
RUN rm ./somewhere/giant.zip

FROM scratch
COPY --from=needs-squashing / /
ENV NEEDED_VAR some_value

错误在public class Modbus { public delegate void SerialDataReceivedEventHandler(object sender, SerialDataReceivedEventArgs e); public event SerialDataReceivedEventHandler DataReceived; static SerialPort modbusPort; public Modbus(int baudRate, string port) { modbusPort = new SerialPort(); modbusPort.BaudRate = baudRate; modbusPort.PortName = port; modbusPort.Open(); modbusPort.DataReceived += Incoming; } private void Incoming (object sender, SerialDataReceivedEventArgs e) { if (DataReceived != null) { SerialDataReceivedEventArgs rea = new SerialDataReceivedEventArgs { Data = e.Data }; DataReceived(this, rea); } } } public class SerialDataReceivedEventArgs : EventArgs { public string Data { get; set; } }行

Answer 1

要么Incoming是static（因为modbusPort被声明为static），要么从static声明中删除modbusPort。我认为后者在这里更合适（在非静态构造函数中实例化static引用可能是一种气味）。

我认为您的代码应如下所示：

public class Modbus
{
    public delegate void SerialDataReceivedEventHandler(object sender, SerialDataReceivedEventArgs e);
    public event SerialDataReceivedEventHandler DataReceived;
    private readonly SerialPort modbusPort; // CHANGED THIS LINE

    public Modbus(int baudRate, string port)
    {
        modbusPort = new SerialPort();

        modbusPort.BaudRate = baudRate;
        modbusPort.PortName = port;
        modbusPort.Open();

        modbusPort.DataReceived += Incoming;
    }

    private void Incoming (object sender, SerialDataReceivedEventArgs e)
    {
        if (DataReceived != null)
        {
            SerialDataReceivedEventArgs rea = new SerialDataReceivedEventArgs { Data = e.Data };
            DataReceived(this, rea);
        }
    }
}

Answer 2

所以几个小时后我找到了解决方案，我发布了最终代码：

这是我班上的代码

public class Modbus
{
    public delegate void SerialDataReceivedEventHandler(object sender, SerialDataReceivedEventArgs args);
    public event SerialDataReceivedEventHandler DataReceived;
    private readonly SerialPort modbusPort;
    public Modbus(int baudRate, string port)
    {
        modbusPort = new SerialPort();

        modbusPort.BaudRate = baudRate;
        modbusPort.PortName = port;
        modbusPort.Open();

        modbusPort.DataReceived += Incoming;
    }
    private void Incoming(object sender, SerialDataReceivedEventArgs args)
    {
        DataReceived?.Invoke(this, args);
    }
    public byte[] readE()
    {
        int size = modbusPort.ReadBufferSize;
        byte[] buffer = new byte[size];
        modbusPort.Read(buffer, 0, 1);
        return buffer;
    }
}

代码int Windows窗体，下一行是我初始化Modbus对象

myModbus.DataReceived += Incoming;

和定义

private void Incoming(object sender, SerialDataReceivedEventArgs e)
    {
        Byte[] indata = myModbus.readE();
    }

错误：“传入”没有重载匹配委托“ SerialDataReceivedEventHandler”

2 个答案: