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我正在C＃中构建一个程序，以便在我的大学课程中使用它来演示异步连接如何使用RS-232和两台连接在一起的计算机工作。我的课程不是关于编程，而是数据网络，所以我正在寻找连接。如何知道串口的输入缓冲区有信息，在C＃中？
picture 1 - sample layout of GUI using Visual Studio 2015
有一个问题我想在我的程序来实现的功能是展示如何主从，单工连接工程（即程序可以是一个主从键盘输入发送之间进行选择;或奴隶只接收信息并将其打印在文本框上）。
我已经能够初始化具有特定特性（波特率，数据位，停止位等）的串行端口。此功能是使用GUI中的组合框选择的，并在用户单击按钮以“打开端口”时分配给该端口。
我不知道的是如何创建程序的“奴隶”部分。我的想法是，当你选择程序为“奴隶”后，你打开端口等待某种标志或事件触发，当输入缓冲区存储数据时。
我一直在阅读几个论坛，我找不到任何类似于我需要的东西。不过，我已经测试了多种替代品，我相信这些替代品会让我更接近我需要的东西，而几乎没有结果。我来问一个我可能做错什么的想法，或者提出如何解决这个问题的建议。有问题的线是粗体（或2星（*））：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO.Ports;
namespace SerialCommTester
{
public partial class frmSerialComm : Form
{
static SerialPort _PuertoSerial;
public frmSerialComm()
{
InitializeComponent();
getAvailablePorts();
}
//---------------------------------my functions--------------------------------------
void getAvailablePorts()
{
string[] ports = SerialPort.GetPortNames();
cmbPortList.Items.AddRange(ports);
}
void activatePort()
{
//Note that all the combo boxes are named somewhat accordingly to what the information they are meant to display.
if (cmbPortList.Text != "" && cmbBaudRate.Text != "" && cmbParity.Text != "" && cmbStopBits.Text != "")
{
_PuertoSerial.PortName = cmbPortList.Text;
_PuertoSerial.BaudRate = Convert.ToInt32(cmbBaudRate.Text);
_PuertoSerial.RtsEnable = true;
_PuertoSerial.DtrEnable = true;
_PuertoSerial.DataBits = Convert.ToInt32(cmbDataBits.Text);
if (cmbParity.Text == "Even") { _PuertoSerial.Parity = Parity.Even; }
else if (cmbParity.Text == "Odd") { _PuertoSerial.Parity = Parity.Odd; }
else if (cmbParity.Text == "Space") { _PuertoSerial.Parity = Parity.Space; }
else if (cmbParity.Text == "Mark") { _PuertoSerial.Parity = Parity.Mark; }
else { _PuertoSerial.Parity = Parity.None; }
if (cmbStopBits.Text =="2") { _PuertoSerial.StopBits = StopBits.Two; }
else if (cmbStopBits.Text == "1.5") { _PuertoSerial.StopBits = StopBits.OnePointFive; }
else { _PuertoSerial.StopBits = StopBits.One; }
if (cmbHandShake.Text == "Software Flow Control") { _PuertoSerial.Handshake = Handshake.XOnXOff; }
else if (cmbHandShake.Text == "Hardware Flow Control") { _PuertoSerial.Handshake = Handshake.RequestToSend; }
else { _PuertoSerial.Handshake = Handshake.None; }
_PuertoSerial.ReadTimeout = 500;
_PuertoSerial.WriteTimeout = 500;
_PuertoSerial.Open();
//in my understanding, this line of code is needed to handle data being received. Does it trigger a flag or something?
**_PuertoSerial.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler);**
}
else
{
txtRecieve.Text = "Input selection missing 1 or more characteristics";
}
}
**
private static void DataReceivedHandler(object sender, SerialDataReceivedEventArgs e)
{
SerialPort testing = (SerialPort)sender;
txtRecieve.AppendText(testing.ReadExisting()); //txtRecieve cannot be reached within this function. It indicates the following error: "An object reference is required for the non-static field, method, or property 'frmSerialComm.txtRecieve'
}
**
void enableDisableGUI(bool[] input)
{
grpConnection.Enabled = input[0];
grpCharacteristics.Enabled = input[1];
btnOpenPort.Enabled = input[2];
btnClosePort.Enabled = input[3];
txtSend.Enabled = ((cmbControlMasterSlave.Text == "Slave") ? false : true);
}
//----------------------------C# objects/functions--------------------------------------
private void btnOpenPort_Click(object sender, EventArgs e)
{
try
{
_PuertoSerial = new SerialPort();
activatePort();
}
catch(Exception ex)
{
MessageBox.Show(ex.Message, "Message ", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
bool[] format = { false, false, false, true};
enableDisableGUI(format);
}
private void btnClosePort_Click(object sender, EventArgs e)
{
_PuertoSerial.Close();
bool[] format = { true, true, true, false};
enableDisableGUI(format);
}
private void txtSend_KeyPress(object sender, KeyPressEventArgs e)
{
_PuertoSerial.Write(e.KeyChar.ToString()); //this is how I send data through the serial port.
}
private void btnClearTxts_Click(object sender, EventArgs e)
{
txtRecieve.Clear();
txtSend.Clear();
}
} //class closes
} //program closes
我不是一个有经验的程序员，我只是想创建我的学生有用的东西。任何建设性的批评将不胜感激。
感谢您的帮助！ – DonPandon