C＃，串行端口的事件处理程序错误

Question

我正在为串行IO端口编写数据接收事件...以下是代码

 using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
using System.IO;   //add namespaces
using System.IO.Ports;
     public class Program
        {

            //define a delegate class to handle DataReceived events
            internal delegate void SerialDataReceivedEventHanderDelegate(object sender,SerialDataReceivedEventArgs e);

            internal void DataReceived(object sender, SerialDataReceivedEventArgs e)
            {
                //place code to read and process data here
            }

            static void Main()
            {

                string myComPortName=null;
                //1. find available COM port
                string[] nameArray = null;
                nameArray = SerialPort.GetPortNames();
                if(nameArray.GetUpperBound(0)>0) {
                myComPortName = nameArray[0];  
                }
                else {
                    Console.WriteLine("Error");
                    return;
                }    

                //2. create a serialport object
                // the port object is closed automatically by use using()
                SerialPort myComPort = new SerialPort();

                myComPort.PortName = myComPortName; //the default paramit are 9600,no parity,one stop bit, and no flow control

                   private static SerialDataReceivedEventHandler SerialDataReceivedEventHandler1 =
                   new SerialDataReceivedEventHandler(ComPort.DataReceived);

                   myComPort.DataReceived+=SerialDataReceivedEventHandler1;


            }

        }

为什么在VS2010中，行：私有静态SerialDataReceivedEventHandler SerialDataReceivedEventHandler1 = new SerialDataReceivedEventHandler（ComPort.DataReceived）;

向我显示：1.无效的表达术语“私人” 2.修饰语“静态”对此术语无效3.我应该在此处使用Comport吗？ 或只是DataReceived ...因为它的函数名称

感谢您的回复。

Answer 1

private和static在方法范围内无效。 您只能在类级别声明静态项-即在这里：

public class Program
{
   private static object _memberField;

   private static void MemberMethod()
   {
     // not here:
     // private static object _insideMethod; // <- will not work
   }
}

Answer 2

不需要私有静态，只需：-

var SerialDataReceivedEventHandler1 =
                   new SerialDataReceivedEventHandler(ComPort.DataReceived);

但是如果您希望成为Program类的成员，请将声明移至：-

   public class Program
        {

       private static SerialDataReceivedEventHandler;

那你需要在Main

SerialDataReceivedEventHandler1 =
                       new SerialDataReceivedEventHandler(ComPort.DataReceived);

但是更有可能的是，您真的想开始自己的类，因为“程序”并不是真正的最佳选择。...并且处理静态类和静态方法有点混乱

Answer 3

private用于控制类型成员或类型本身的可访问性。 它不适用于作为方法一部分的变量，因为方法本身已经可以最方便地访问它。

此外，静态修饰符也无效。 它也适用于某种类型的成员，以指示该成员是否知道实例。

您的电话：

private static SerialDataReceivedEventHandler SerialDataReceivedEventHandler1 =  
               new SerialDataReceivedEventHandler(ComPort.DataReceived);

应该：

SerialDataReceivedEventHandler SerialDataReceivedEventHandler1 =  
               new SerialDataReceivedEventHandler(ComPort.DataReceived);  

但是，该行似乎完全没有必要。 您可以将其简化为：

myComPort.DataReceived += ComPort.DataReceived;

Answer 4

该行位于main方法内部。 私有和静态仅在方法之外被允许。

Answer 5

private限定词仅适用于您的类定义中的成员（成员变量/方法）。 SerialDataReceivedEventHandler只是方法内部具有的变量。