c#接口(interface)实现错误

Question

我正在为我的应用程序开发通信管理器，其设计如下:

ICommunicator接口(interface)，一个通用的通信器。

public interface ICommunicator
{
    bool openConnection();
    bool closeConnection();

    bool isConnectionOpen();
    Form getConfigurationForm();

    void Data_Input(object sender, EventArgs e);
}

目前，一个具体的通信器是 SerialCommunicator:

public class SerialCommunicator : ICommunicator
{
    public delegate bool setPortDelegate(string portName);
    public delegate bool setBaudRateDelegate(int baudRate);

    private SerialPort serial;

    public SerialCommunicator()
    {
        serial = new SerialPort();
        loadDefaultSerialPreset(serial);
        serial.DataReceived += Data_Input;
    }

    public bool openConnection()
    {
        if (serial.IsOpen)
        {
            return false;
        }
        try
        {
            serial.Open();
        }
        catch (Exception)
        {
            //could not open the port
            return false;
        }

        return serial.IsOpen;
    }

    public bool closeConnection()
    {
        try
        {
            serial.Close();
        }
        catch (Exception)
        {
            return false;
        }
        return !serial.IsOpen;
    }

    public bool isConnectionOpen()
    {
        return this.serial.IsOpen;
    }

    public bool sendData(String text)
    {
        if (!this.serial.IsOpen)
        { return false; }

        return true;
    }

    public void Data_Input(object sender, SerialDataReceivedEventArgs e)
    {
        String s = serial.ReadLine();
        //tbd
    }

    public Form getConfigurationForm()
    {
        return new portConf(setPortName, setBaudRate);
    }

    private bool setPortName(string portName)
    {
        if (portName == null || portName.Length < 1 || !portName.StartsWith("COM"))
        {
            return false;
        }
        if (serial.IsOpen)
        {
            return false;
        }
        serial.PortName = portName;
        return true;
    }

    private bool setBaudRate(int baudRate)
    {
        if (baudRate < 9600 || baudRate > 115200)
        {
            return false;
        }
        if (serial.IsOpen)
        {
            return false;
        }
        serial.BaudRate = baudRate;
        return true;
    }

    private void loadDefaultSerialPreset(SerialPort s)
    {
        //default preset
        s.BaudRate = 115200;
        s.PortName = "COM1";
        //default settings
        s.DataBits = 8;
        s.DiscardNull = false;
        s.DtrEnable = false;
        s.Handshake = Handshake.None;
        s.Parity = Parity.None;
        s.ParityReplace = 63;
        s.ReadBufferSize = 4096;
        s.ReadTimeout = -1;
        s.ReceivedBytesThreshold = 1;
        s.RtsEnable = false;
        s.StopBits = StopBits.One;
        s.WriteBufferSize = 2048;
        s.WriteTimeout = -1;
    }
}

问题是，编译器说 SerialCommunicator 没有实现接口(interface):

'SerialCommunicator' does not implement interface member 'ICommunicator.Data_Input(object, EventArgs)'

我不明白为什么它会给我那个错误。我确实有 Data_Input(object, SerialDataReceivedEventArgs) ，尽管每个 SerialDataReceivedEventArgs 也是一个 EventArgs 对象。

为什么编译器给我这个问题，我该如何解决(我确实需要那个事件来进行其他类型的通信)

Answer 1

还有这些:

//Interface
void Data_Input(object sender, EventArgs e);
// Derived class
public void Data_Input(object sender, SerialDataReceivedEventArgs e)

不是一回事——它们是两种不同的类型。实现接口(interface)时，签名必须与接口(interface)中的签名相同。

您应该将派生更改为完全接口(interface)或使用通用参数+约束。

//Interface
public interface ICommunicator<TEventArgs>
    where TEventArgs : EventArgs
{
    void Data_Input(object sender, TEventArgs e);
}

//Derived
public class SerialCommunicator : ICommunicator<SerialDataReceivedEventArgs>
{
    public void Data_Input(object sender, SerialDataReceivedEventArgs e)
    {
        throw new NotImplementedException();
    }
}

即使您不在此处使用泛型，请记住，虽然该方法将有一个 EventArgs 参数，但您当然可以将派生类型传递给它。