Recent study using c # write a serial port test software, from a serial port receives the data, and the data map into a waveform, used in the practical application of control chart is (measurement studio2015 waveformgraph not useful) in the test found that chart after 1000-2000 data points in the drawing, application can appear abnormal, when I comment the add data to the chart after the function of running without exception occurs,

Abnormal remind is: "System. InvalidOperationException" type of untreated anomalies in the System. Windows. Forms. DataVisualization. DLL,

Don't know if you have good solution,


Anomaly map and the code is as follows:




The code is as follows:

 using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Windows.Forms; 

Using System. The Runtime. InteropServices; 
Using System. Windows. Forms. DataVisualization. Charting; 
using System.IO; 
Using System. IO. Ports; 
Using NationalInstruments; 
//using NationalInstruments. Controls. The Data; 


The namespace HRM200Test 
{

Public partial class Form1: Form 
{
Int Timercount=0;//for the timer count 
Byte [] gDataToSend=new byte [2] {0 x00 to 0 x00};//data 


Public _click () 
{
InitializeComponent (); 
System. Windows. Forms. Control. CheckForIllegalCrossThreadCalls=false; 
//timer1. Start (); 
} 
Internal class flagclass 
{
Public static int button1_click_flag=0; 
Public static int button4_click_flag=0; 
Public static int button5_click_flag=0; 
Public static int PCR_Run_flag=0; 
Public static int StepCnt=0; 
Public static int LoopCnt=0; 
Public static int TimeValue=https://bbs.csdn.net/topics/0; 
Public static int Predegeneration_flag=0; 
Public static int DaRxCnt=0; 
Public static byte [] DataRxBuf=new byte [50]. 
Public static byte [] TemperByte=new byte [5]. 
} 
Private void button1_Click (object sender, EventArgs e) 
{
If (flagclass. Button1_click_flag==0) 
{
Try 
{
SerialPort1. PortName=comboBox1. Text; 
SerialPort1. BaudRate=the Convert. ToInt32 (comboBox2. Text, 10);//decimal data conversion 
SerialPort1. The Open (); 
Flagclass. Button1_click_flag=1; 
For the BackColor=SystemColors. ActiveCaption; 
For the Text="close serial port"; 
} 
Catch 
{
MessageBox. Show (" port error, please check the serial port ", "error"); 
} 
} 
The else 
{
Try 
{

SerialPort1. Close ();//close a serial port 
For the Text="open the serial port"; 
For the Enabled=true;//open the serial port button available 
For the BackColor=SystemColors. InactiveBorder; 
Flagclass. Button1_click_flag=0; 
} 
Catch (Exception)//Exception err)//usually close serial port will not go wrong, so don't need to add the handler 
{

} 
} 
} 

Private void Form1_Load (object sender, EventArgs e) 
{
SearchAndAddSerialToComboBox (serialPort1 comboBox1); 
ComboBox2. SelectedIndex=3; 
Button4. Enabled=false; 
ChartInit (); 
} 

Private void serialPort1_DataReceived (object sender, SerialDataReceivedEventArgs e) 
{
Int LEN=50; 
Int16 I=0; 
Fdata=https://bbs.csdn.net/topics/new float float [] [4]. 
Byte [] crcvalue=https://bbs.csdn.net/topics/new byte [2] {0 x00 to 0 x00}; 
Byte [] buffer1=new byte (LEN); 
Int [] buf1=new int [100]. 
LEN=0; 
LEN=serialPort1. BytesToRead; 
SerialPort1. Read (buffer1, 0, LEN); 
If (buffer1 [0]==0 x41 & amp; & Buffer1 [1]==0 x04 & amp; & CRC16_2 (buffer1) [0]==buffer1 [18] & amp; & CRC16_2 (buffer1) [1]==buffer1 [19]) 
{
For (int j=0; J & lt; 4. J++) 
{
Flagclass. TemperByte [3]=buffer1 [j * 4 + 2]; 
Flagclass. TemperByte [2]=buffer1 [j * 4 + 3]; 
Flagclass. TemperByte [1]=buffer1 [j * 4 + 4]; 
Flagclass. TemperByte [0]=buffer1 [j] * 4 + 5; 
Fdata=BitConverter [j]. J ToSingle (flagclass. TemperByte, 0); 
} 
Try 
{
Chart2. Series [0]. Points. AddY (fdata [1]). 
TextBox11. Text=fdata [1]. The ToString (); 
If ((chart2 ChartAreas [0]. AxisX. The Maximum - chart2. ChartAreas [0]. AxisX. Minimum) & gt; 
=1024)Chart2. ChartAreas [0]. AxisX. Minimum=chart2. ChartAreas [0]. AxisX. Maximum - 1024; 
} 
Catch {
MessageBox. Show (" error!" , "z"); 
} 
} 
The else 
{
Strings str1=System. Text. Encoding. The Default. Get string (buffer1);//buffer1. ToString (); 
TextBox1. AppendText (str1);//add content 
TextBox1. Text. ToArray (); 
} 

} 
Private void SendDataToSerialPort (SerialPort MyPort, byte [] DataToSend)//single-byte send data 
{
Const byte Nlen=0 x07; 
Byte [] crcvalue=https://bbs.csdn.net/topics/new byte [2] {0 x00 to 0 x00}; 
Crcvalue [0]=CRC16 (DataToSend) [0]; 
Crcvalue [1]=CRC16 (DataToSend) [1]; 
Byte [] DatasToWrite=new byte [Nlen] {0 x54, DataToSend [0], DataToSend [1], crcvalue [0], crcvalue [1], 0 x0d, 0 x0a};//packet 
If (serialPort1. IsOpen) 
{
Try 
{
//MyPort. WriteLine (" "); 
MyPort. Write (DatasToWrite, 0, Nlen);//send data 
} 
Catch 
{
nullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnull