C# 如何显示在串行端口的 DataReceived 事件处理程序中读取的数据
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How to display the data read in DataReceived event handler of serialport
提问by Cdeez
I have the following code which needs the data to be read from port and then display in a textbox. I am using DataReceived event handler for this purpose but donot know how to display this data in textbox. From various sources i learnt that Invoke method should be used for this but donot know how to use it. Suggestions please...
我有以下代码需要从端口读取数据然后显示在文本框中。我为此使用 DataReceived 事件处理程序，但不知道如何在文本框中显示此数据。我从各种来源了解到应该为此使用 Invoke 方法，但不知道如何使用它。建议请...
private void Form1_Load(object sender, EventArgs e)
{
//SerialPort mySerialPort = new SerialPort("COM3");
mySerialPort.PortName = "COM3";
mySerialPort.BaudRate = 9600;
mySerialPort.Parity = Parity.None;
mySerialPort.StopBits = StopBits.One;
mySerialPort.DataBits = 8;
mySerialPort.Handshake = Handshake.None;
mySerialPort.DataReceived += new SerialDataReceivedEventHandler(mySerialPort_DataReceived);
mySerialPort.Open();
}
private void mySerialPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
SerialPort sp = (SerialPort)sender;
string s= sp.ReadExisting();
// next i want to display the data in s in a textbox. textbox1.text=s gives a cross thread exception
}
private void button1_Click(object sender, EventArgs e)
{
mySerialPort.WriteLine("AT+CMGL=\"ALL\"");
}
采纳答案by Frank Bollack
The MSDN contains a good articlewith examples about using control methods and properties from other threads.
MSDN 包含一篇很好的文章，其中包含有关使用其他线程的控制方法和属性的示例。
In short, what you need is a delegate method that sets the Textproperty of your text box with a given string. You then call that delegate from within your mySerialPort_DataReceivedhandler via the TextBox.Invoke()method. Something like this:
简而言之，您需要的是一个委托方法，它Text使用给定的字符串设置文本框的属性。然后，您可以mySerialPort_DataReceived通过该TextBox.Invoke()方法从处理程序中调用该委托。像这样的东西：
public delegate void AddDataDelegate(String myString);
public AddDataDelegate myDelegate;
private void Form1_Load(object sender, EventArgs e)
{
//...
this.myDelegate = new AddDataDelegate(AddDataMethod);
}
public void AddDataMethod(String myString)
{
textbox1.AppendText(myString);
}
private void mySerialPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
SerialPort sp = (SerialPort)sender;
string s= sp.ReadExisting();
textbox1.Invoke(this.myDelegate, new Object[] {s});
}
回答by KMC
Try this (works for me):
试试这个（对我有用）：
private delegate void UpdateUiTextDelegate(string text);
private void Receive(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
{
if (mySerialPort.IsOpen)
{
RxString = mySerialPort.ReadLine();
Dispatcher.Invoke(DispatcherPriority.Send, new UpdateUiTextDelegate(DisplayText), RxString);
}
}
private void DisplayText(string RxString)
{
myTextBox.Text = RxString;
}
回答by Fixer
I'm creating a GUI "Form" for USB COM Ports. This is how I send data to the window without getting a "Cross-Thread" error.
我正在为 USB COM 端口创建一个 GUI“表单”。这就是我如何将数据发送到窗口而不会出现“跨线程”错误。
private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
string inData = serialPort1.ReadLine(); // ReadLine includes the + "\n"
displayToWindow(inData);
}
private void displayToWindow(string inData)
{
BeginInvoke(new EventHandler(delegate
{
richTextBox1.AppendText(inData);
richTextBox1.ScrollToCaret();
}));
}
