我编写了一个程序，它连接到arduino的串口并接收设备发送的数据，但我在程序中显示它有一点问题，我从未看到过该错误。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.IO;
using System.IO.Ports;
using System.Windows.Forms;
using System.Windows.Forms.DataVisualization.Charting;
using port.dbDataSetTableAdapters;
namespace Factory_Performance
{
public partial class FrmMain : Form
{
string s;
Series series = new Series();
SerialPort ComPort = new SerialPort();
internal delegate void SerialDataReceivedEventHandlerDelegate(object sender, SerialDataReceivedEventArgs e);
internal delegate void SerialPinChangedEventHandlerDelegate(object sender, SerialPinChangedEventArgs e);
private SerialPinChangedEventHandler SerialPinChangedEventHandler1;
delegate void SetTextCallback(int ReadByte);
int InputData = 0;
private int CountData;
private string StrData;
double[] Values;
public FrmMain()
{
InitializeComponent();
SerialPinChangedEventHandler1 = new SerialPinChangedEventHandler(PinChanged);
ComPort.DataReceived += new System.IO.Ports.SerialDataReceivedEventHandler(port_DataReceived_1);
}
private double calculate_input(int s2, int s3)
{
return double.Parse(s2.ToString() + "/" + s3.ToString());
}
private void GetAllIDInDB()
{
tblIDTableAdapter.Fill(dbDataSet.TblID);
CmbID.Items.Clear();
for (int i = 0; i < dbDataSet.TblID.Rows.Count; i++)
CmbID.Items.Add(dbDataSet.TblID.Rows[i]["ID"].ToString());
}
private void GetAllID_DetailsInDB(int ID)
{
tblID_DetailsTableAdapter.FillByID(dbDataSet.TblID_Details, ID);
LstItems.Items.Clear();
for (int i = 0; i < dbDataSet.TblID_Details.Rows.Count; i++)
LstItems.Items.Add(dbDataSet.TblID_Details.Rows[i]["Value"].ToString());
}
private void GetInfoPorts()
{
try
{
string[] ArrayComPortsNames = null;
int index = -1;
string ComPortName = null;
cboPorts.Items.Clear();
cboBaudRate.Items.Clear();
cboStopBits.Items.Clear();
cboParity.Items.Clear();
cboHandShaking.Items.Clear();
//Com Ports
ArrayComPortsNames = SerialPort.GetPortNames();
do
{
index += 1;
cboPorts.Items.Add(ArrayComPortsNames[index]);
} while (!((ArrayComPortsNames[index] == ComPortName) || (index == ArrayComPortsNames.GetUpperBound(0))));
Array.Sort(ArrayComPortsNames);
if (index == ArrayComPortsNames.GetUpperBound(0))
{
ComPortName = ArrayComPortsNames[0];
}
//get first item print in text
cboPorts.Text = ArrayComPortsNames[0];
//Baud Rate
cboBaudRate.Items.Add(115200);
cboBaudRate.Items.Add(300);
cboBaudRate.Items.Add(600);
cboBaudRate.Items.Add(1200);
cboBaudRate.Items.Add(2400);
cboBaudRate.Items.Add(9600);
cboBaudRate.Items.Add(14400);
cboBaudRate.Items.Add(19200);
cboBaudRate.Items.Add(38400);
cboBaudRate.Items.Add(57600);
cboBaudRate.Items.ToString();
//get first item print in text
cboBaudRate.Text = cboBaudRate.Items[0].ToString();
//Data Bits
cboDataBits.Items.Add(8);
cboDataBits.Items.Add(7);
//get the first item print it in the text
cboDataBits.Text = cboDataBits.Items[0].ToString();
//Stop Bits
cboStopBits.Items.Add("One");
cboStopBits.Items.Add("OnePointFive");
cboStopBits.Items.Add("Two");
//get the first item print in the text
cboStopBits.Text = cboStopBits.Items[0].ToString();
//Parity
cboParity.Items.Add("None");
cboParity.Items.Add("Even");
cboParity.Items.Add("Mark");
cboParity.Items.Add("Odd");
cboParity.Items.Add("Space");
//get the first item print in the text
cboParity.Text = cboParity.Items[0].ToString();
//Handshake
cboHandShaking.Items.Add("XOnXOff");
cboHandShaking.Items.Add("None");
cboHandShaking.Items.Add("RequestToSend");
cboHandShaking.Items.Add("RequestToSendXOnXOff");
//get the first item print it in the text
cboHandShaking.Text = cboHandShaking.Items[0].ToString();
}
catch
{
MessageBox.Show("خطا در گرفتن اطلاعات پورت");
}
}
private void port_DataReceived_1(object sender, SerialDataReceivedEventArgs e)
{
InputData = ComPort.ReadByte();
if (InputData != 0)
{
s= Convert.ToString(Convert.ToChar(InputData));
this.BeginInvoke(new SetTextCallback(SetText), new object[] { InputData });
label12.Text =Convert.ToString(s);
}
}
private void SetText(int ReadByte)
{
this.LstGetInfo.Items.Add(ReadByte);
}
internal void PinChanged(object sender, SerialPinChangedEventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{
Values = new double[CountData];
for (int i = 0; i < CountData; i++)
Values[i] = (int)StrData[i];
Array.Reverse(Values);
chart1.Titles.Clear();
chart1.Titles.Add(TxtTitle.Text);
chart1.Series.Clear();
series.Points.Clear();
for (int i = 0; i < CountData; i++)
series.Points.AddXY(TxtTitleSeries.Text + " " + i.ToString(), Values[i]);
chart1.Series.Add(series);
}
private void groupBox1_Enter(object sender, EventArgs e)
{
}
private void button2_Click(object sender, EventArgs e)
{
Application.Exit();
}
private void button3_Click(object sender, EventArgs e)
{
}
private void CmbPalette_SelectedIndexChanged(object sender, EventArgs e)
{
chart1.Palette = (ChartColorPalette)CmbPalette.SelectedIndex;
}
private void CmbChartType_SelectedIndexChanged(object sender, EventArgs e)
{
series.ChartType = (SeriesChartType)CmbChartType.SelectedIndex;
}
private void FrmMain_Load(object sender, EventArgs e)
{
// TODO: This line of code loads data into the 'dbDataSet.TblID_Details' table. You can move, or remove it, as needed.
this.tblID_DetailsTableAdapter.Fill(this.dbDataSet.TblID_Details);
// TODO: This line of code loads data into the 'dbDataSet.TblID' table. You can move, or remove it, as needed.
this.tblIDTableAdapter.Fill(this.dbDataSet.TblID);
GetInfoPorts();
CmbPalette.SelectedIndex = 1;
CmbChartType.SelectedIndex = 4;
CountData = 0;
}
private void button3_Click_1(object sender, EventArgs e)
{
}
private void button4_Click(object sender, EventArgs e)
{
}
private void button3_Click_2(object sender, EventArgs e)
{
}
private void button4_Click_1(object sender, EventArgs e)
{
/* if (openFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
FileStream fs = new FileStream(openFileDialog1.FileName, FileMode.Open, FileAccess.Read);
StreamReader sr = new StreamReader(fs);
TxtPath.Text = openFileDialog1.FileName;
string[] StrInfo = sr.ReadToEnd().Split(',');
int[] Values2 = new int[StrInfo.Length - 4];
for (int i = 0; i < StrInfo.Length-4; i++)
Values2[i] = int.Parse(StrInfo[i+4]);
string StrTemp = "";
foreach (int n in Values2)
StrTemp += (char)n;
CountData = StrTemp.Length;
StrData = StrTemp;
Values = new int[CountData];
for (int i = 0; i < CountData; i++)
Values[i] = (int)StrData[i];
//Array.Reverse(Values);
chart2.Palette = (ChartColorPalette)int.Parse(StrInfo[2]);
series.ChartType = (SeriesChartType)int.Parse(StrInfo[3]);
chart2.Titles.Clear();
chart2.Titles.Add(StrInfo[0]);
chart2.Series.Clear();
series.Points.Clear();
for (int i = 0; i < CountData; i++)
series.Points.AddXY(StrInfo[1] + " " + i.ToString(), Values[i]);
chart2.Series.Add(series);
StrTemp = "";
Array.Reverse(Values2);
foreach (int n in Values2)
StrTemp += (char)n;
TxtDateRecovery.Text = DecryptStringAES(StrTemp, TxtKeyDecrypt.Text);
}*/
}
private void btnGetSerialPorts_Click(object sender, EventArgs e)
{
GetInfoPorts();
}
private void btnPortState_Click(object sender, EventArgs e)
{
try
{
if (btnPortState.Text == "ارتباط با دستگاه")
{
btnPortState.Text = "قطع ارتباط با دستگاه";
ComPort.PortName = Convert.ToString(cboPorts.Text);
ComPort.BaudRate = Convert.ToInt32(cboBaudRate.Text);
ComPort.DataBits = Convert.ToInt16(cboDataBits.Text);
ComPort.StopBits = (StopBits)Enum.Parse(typeof(StopBits), cboStopBits.Text);
ComPort.Handshake = (Handshake)Enum.Parse(typeof(Handshake), cboHandShaking.Text);
ComPort.Parity = (Parity)Enum.Parse(typeof(Parity), cboParity.Text);
ComPort.Open();
ComPort.Write("A");// کاراکتر شروع انجام عملیات ارسال داده
LstGetInfo.Items.Clear();
}
else if (btnPortState.Text == "قطع ارتباط با دستگاه")
{
btnPortState.Text = "ارتباط با دستگاه";
ComPort.Close();
}
}
catch
{
btnPortState.Text = "ارتباط با دستگاه";
ComPort.Close();
MessageBox.Show("خطا در انجام عملیات");
}
}
private void button1_Click_1(object sender, EventArgs e)
{
if(LstGetInfo.Items.Count <= 0) return;
int ItemCount = int.Parse(LstGetInfo.Items[0].ToString());
int ItemIDCount = 0;
int ItemID = 0;
int ItemValue1 = 0, ItemValue2 = 0;
TblIDTableAdapter tblid = new TblIDTableAdapter();
TblID_DetailsTableAdapter tblid_details = new TblID_DetailsTableAdapter();
tblid.DeleteAllID();
LstGetInfo.Items.RemoveAt(0);
for (int i = 0; i < ItemCount; i++)
{
ItemID = int.Parse(LstGetInfo.Items[0].ToString());
LstGetInfo.Items.RemoveAt(0);
tblid.Insert(ItemID);
if (LstGetInfo.Items.Count > 0)
{
ItemIDCount = int.Parse(LstGetInfo.Items[0].ToString());
LstGetInfo.Items.RemoveAt(0);
for (int j = 0; j < ItemIDCount; j += 2)
{
ItemValue1 = int.Parse(LstGetInfo.Items[0].ToString());
LstGetInfo.Items.RemoveAt(0);
ItemValue2 = int.Parse(LstGetInfo.Items[0].ToString());
LstGetInfo.Items.RemoveAt(0);
tblid_details.Insert(ItemID, calculate_input(ItemValue1, ItemValue2));
}
}
}
GetAllIDInDB();
}
private void CmbID_SelectedIndexChanged(object sender, EventArgs e)
{
GetAllID_DetailsInDB(int.Parse(CmbID.Text));
if (LstItems.Items.Count > 0)
ShowChart();
}
private void CmbPalette_SelectedIndexChanged_1(object sender, EventArgs e)
{
chart1.Palette = (ChartColorPalette)CmbPalette.SelectedIndex;
}
private void CmbChartType_SelectedIndexChanged_1(object sender, EventArgs e)
{
series.ChartType = (SeriesChartType)CmbChartType.SelectedIndex;
}
private void ShowChart()
{
CountData = LstItems.Items.Count;
Values = new double[CountData];
for (int i = 0; i < CountData; i++)
Values[i] = double.Parse(LstItems.Items[i].ToString());
chart1.Titles.Clear();
chart1.Titles.Add(TxtTitle.Text);
chart1.Series.Clear();
series.Points.Clear();
int Step = 0;
for (int i = 0; i < CountData; i++, Step +=10)
series.Points.AddXY(TxtTitleSeries.Text + " " + Step.ToString(), Values[i]);
chart1.Series.Add(series);
}
private void button3_Click_3(object sender, EventArgs e)
{
GetAllIDInDB();
}
}
}
在本节中，visual studio会出现一个错误，我无法理解它发生了什么
if (InputData != 0)
{
s= Convert.ToString(Convert.ToChar(InputData));
this.BeginInvoke(new SetTextCallback(SetText), new object[] { InputData });
label12.Text =Convert.ToString(s);
}
}
任何人都有这个问题吗？
错误：
An unhandled exception of type 'System.InvalidOperationException' occurred in System.Windows.Forms.dll
Additional information: Cross-thread operation not valid: Control 'label12' accessed from a thread other than the thread it was created on
答案 0 :(得分：1)
现有的大多数图形用户界面（GUI）框架都是单线程的。这意味着它们只在自己的线程中传递事件，并且只能从它们自己的线程中调用它们。对于您似乎正在使用的WinForms也适用。
您收到的异常是告诉您，您试图从不是GUI线程的线程调用您的GUI（您试图访问控件＆＃34; label12＆＃34;）。
所以，要克服你的问题，要么
重构代码，以免您尝试从其他线程访问控件，或
使用Control.Invoke这是为安全地调用其他线程的控件而提供的少数方法之一。更多信息请访问：MSDN - Control.Invoke