将事件的参数从另一个类传递到主类

本文关键字:另一个 事件 参数 | 更新日期: 2023-09-27 18:02:20

我有一个主(Form1)类,第二个类处理所有串行通信(ComPort)

当通过串行端口(事件)接收到新数据时,我想将其传递给Form1并对该数据进行一些操作。小示例:从接收到的数据

创建长字符串

Form1.cs

public partial class Form1 : Form  
{  
//Creating instance of SerialCommunication.
....
....
string receivedString = ""; //Here I will store all data
public void addNewDataMethod(string newDataFromSerial)
{ 
  receivedString = receivedString + newDataFromSerial;
  MessageBox.Show(receivedString);
}

}

SerialCommunication.cs

public partial class SerialCommunicationPort   
    {  
      constructor()  
      {      
       .... //open serial port with the relevant parameters  
       ComPort.DataReceived += new SerialDataReceivedEventHandler(ComPortBufferRead);//Create Handler  
      }  
     public void ComPortBufferRead(object sender, SerialDataReceivedEventArgs e)  
     {  
      //create array to store buffer data  
      byte[] inputData = new byte[ComPort.BytesToRead];  
      //read the data from buffer  
      ComPort.Read(inputData, 0, ComPort.BytesToRead);  
    //*****  What should I write here in order to  pass "inputData" to Form1.addNewDataMethod ?

    }  
  }

I Tried the following:

Form1 Form;  
Form1.addNewDataMethod(inputData.ToString());

上面的代码会产生一个错误:使用未赋值的局部变量"Form"

Form1 Form1 = new Form1(); 
Form1.addNewDataMethod(inputData.ToString());

上面的代码将创建一个新的Form1实例,并且不包含之前接收到的数据。

有什么建议吗

将事件的参数从另一个类传递到主类

SerialCommunication类中创建一个事件,该事件将在数据到达时引发:

public partial class SerialCommunicationPort   
{ 
    public event Action<byte[]> DataReceived;
    public void ComPortBufferRead(object sender, SerialDataReceivedEventArgs e)  
    {       
       byte[] inputData = new byte[ComPort.BytesToRead];  
       ComPort.Read(inputData, 0, ComPort.BytesToRead);  
       if (DataReceived != null)
           DataReceived(inputData);
    }  
}

然后在您的表单中订阅此事件。

public partial class Form1 : Form  
{  
    SerialCommunication serialCommunication;
    public Form1()
    {
        InitializeComponent();
        serialCommunication = new SerialCommunication();
        serialCommunication.DataReceived += SerialCommunication_DataReceived;
    } 
    private void SerialCommunication_DataReceived(byte[] data)
    {
        // get string from byte array 
        // and call addNewDataMethod
    }
}

如果你想遵循微软的编码指南的WinForms,那么代替Action<byte[]>委托,你应该使用EventHandler<DataReceivedEventArgs>委托,其中DataReceivedEventArgs是从EventArgs继承的类。

最好的方法可能是使用事件。定义一个EventArgs参数的事件,该参数接受一个字符串。在Form1中订阅事件,在串行通信类中触发事件,将您想要的字符串传递给eventargs。

你想要的方式应该也能工作,但是像这样:

Form1 Form = new Form1();  
Form.Show(); // to display it...
/// to other stuff...
Form.addNewDataMethod(inputData); // call the method on the INSTANCE which you opened!
与方法的用法类似,您可以在Form1中定义一个属性:
private string _myString = "";
public string MyString {
    private get {   
}
set {
    string _myString= value;
   // to with the string what you want
}
}
然后类似于方法调用使用
Form.MyString = "abc";

希望这有帮助!