Re: flickers with draw plots from serial port ? - C# Discussion Boards

6-Jun-10 16:40

I am read plots from serial port and draw it ....

I have problem with flickers ...and use DoubleBuffer property to solve the problem ... but flickers increase rather than the first .... what i should to solve problem ....

what is the best design for Application to smooth drawing ?

Luc Pattyn6-Jun-10 16:57

6-Jun-10 16:57

flickering typically means your paint job takes too long (say more than 10 msec), so it becomes visible to the human eye. Depending on what you have done several steps can be taken to improve it, maybe by a lot. Please explain more, and/or show the relevant code or pseudo-code.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

I only read formatted code with indentation, so please use PRE tags for code snippets.

I'm not participating in frackin' Q&A, so if you want my opinion, ask away in a real forum (or on my profile page).

Honeyboy_206-Jun-10 17:09

6-Jun-10 17:09

I am make method read data from serial port and check plot if it valid or not regarding as some specifications ... if it valid i catch it and store message in arraylist and then read from arraylist to draw plots.

Luc Pattyn6-Jun-10 17:19

6-Jun-10 17:19

That is completely insufficient to judge whether you will have a painting problem or not.
There are a few categories:

1. Throughput
How many bytes do you need from your serial port to complete a drawing? what is the baud rate? is the peripheral sending full throttle, or does it need extra time to generate the data?

2. Plot
What do you need for plotting? is it some library that takes data points and generates an image, which you then paint? which library? how many data points? how big is the bitmap?

3. Organization
How do you structure this? Are you using the DataReceived event? if so, how and when do you transfer control to the GUI thread for painting.
Are you painting in the Paint handler?

Feel free to provide extra information if you think it may be relevant.

PS: take your time, I'm off now.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

I only read formatted code with indentation, so please use PRE tags for code snippets.

I'm not participating in frackin' Q&A, so if you want my opinion, ask away in a real forum (or on my profile page).

Honeyboy_208-Jun-10 5:24

8-Jun-10 5:24

I am paste the code ... can you find the problem and help me ?

I Hope

Ravi Bhavnani6-Jun-10 17:30

Ravi Bhavnani

6-Jun-10 17:30

Honeyboy_20 wrote:
if it valid i catch it and store message in arraylist and then read from arraylist to draw plots.

This leads me to believe that your data read and drawing logic may be too closely coupled. Ideally they should be completely separate, executing in different threads.

When valid data is received, the data reader should fire an event (subscribed to by the UI) that causes the UI to simply invalidate its canvas, which in turn causes it to grab a copy of the data which it uses for purposes of rendering. You'll need to synchronize access in the grab operation.

Hope this helps.

/ravi

My new year resolution: 2048 x 1536
Home | Articles | My .NET bits | Freeware

ravib(at)ravib(dot)com

Honeyboy_207-Jun-10 5:19

7-Jun-10 5:19

Here's the code

<br />
using System;<br />
using System.Collections.Generic;<br />
using System.Linq;<br />
using System.Text;<br />
using System.IO.Ports;<br />
using System.Windows.Forms;<br />
using System.Collections;<br />
using Microsoft.VisualBasic;<br />
<br />
<br />
namespace SerialPort16_5_2010<br />
{<br />
    class ReviceDataFromSeriaLPort<br />
    {<br />
        #region Identifiers<br />
        public SerialPort serialPort1 = new SerialPort();<br />
        public TextBox txtDataRecived = new TextBox();<br />
<br />
        // To Store Message Plot as an Object from Serial and set it to MessageContents Class<br />
        private double range;<br />
        private double azmouth;<br />
        public ArrayList msgSequence = new ArrayList();<br />
        #endregion<br />
<br />
        #region Responsible for connect to serial port<br />
        public void ConnectToSerialPort(string portname, Label lblMessage)<br />
        {<br />
            if (serialPort1.IsOpen)<br />
            {<br />
                serialPort1.Close();<br />
            }<br />
            try<br />
            {<br />
                // Configure the various paramter of Serial Port<br />
<br />
                serialPort1.PortName = portname;<br />
                serialPort1.BaudRate = 9600;<br />
                serialPort1.Parity = Parity.None;<br />
                serialPort1.DataBits = 8;<br />
                serialPort1.StopBits = StopBits.One;<br />
<br />
                // Open Serial<br />
                serialPort1.Open();<br />
<br />
                // Update Status of Serial Port<br />
                lblMessage.Text = portname + " Connected";<br />
<br />
<br />
            }<br />
            catch (Exception ex)<br />
            {<br />
                MessageBox.Show(ex.Message);<br />
            }<br />
        }<br />
        #endregion<br />
<br />
        #region Responsible for Disconnect to serial port<br />
        public void DisconnectToSerialPort(string portname, Label lblMessage)<br />
        {<br />
            try<br />
            {<br />
                serialPort1.Close();<br />
                lblMessage.Text = portname + " Disconnected";<br />
<br />
            }<br />
            catch (Exception ex)<br />
            {<br />
                MessageBox.Show(ex.Message);<br />
            }<br />
<br />
        }<br />
        #endregion<br />
<br />
        #region Delegate and subroutine to update the TextBox control<br />
        //---Delegate and subroutine to update the TextBox control---<br />
        public delegate void myDelegate();<br />
        #endregion<br />
<br />
        #region updateTextBox funtionality<br />
        /* Read bytes by bytes<br />
         * Check Message valid or invalid<br />
         * Store bytes in array List<br />
         */<br />
        int bytesLength=100;<br />
        public void updateTextBox()<br />
        {<br />
            try<br />
            {<br />
                //retrieve number of bytes in the buffer<br />
                 bytesLength = serialPort1.BytesToRead;<br />
         <br />
<br />
                //create a byte array to hold the awaiting data<br />
                byte[] comBuffer = new byte[bytesLength];<br />
<br />
<br />
                #region Read Byte by Byte and check it.<br />
<br />
                for (int BytesCounter = 0; BytesCounter < bytesLength; BytesCounter++)<br />
                {<br />
                    int inputByte = serialPort1.ReadByte();<br />
                    string ConvertByteToHex = Conversion.Hex(inputByte);<br />
                    comBuffer[BytesCounter] = (byte)inputByte;<br />
<br />
                    #region Check if First byte in stream of bytes == 99<br />
                    if (ConvertByteToHex == "99")<br />
                    {<br />
                        // if there only one byte in message we will not process on it.<br />
                        if (BytesCounter + 1 < bytesLength)<br />
                        {<br />
                            int messageLength = serialPort1.ReadByte();<br />
                                                    comBuffer[BytesCounter + 1] = (byte)messageLength;<br />
                            #region Check if messageLength > 4 .. Check 3 probarity of message.<br />
                            if (messageLength > 4)<br />
                            {<br />
                            #region Check if messageLength == 4<br />
                                if (messageLength == 4)<br />
                                {<br />
<br />
                                }<br />
                                #endregion<br />
<br />
                            #region Check if messageLength == 10<br />
                                else if (messageLength == 10)<br />
                                {<br />
                                    //to Check if message length which reads in second byte are like the exists in serial port.<br />
                                    if (BytesCounter + messageLength <= bytesLength)<br />
                                    {<br />
                                        for (int msgByteCounter = 2; msgByteCounter < messageLength; msgByteCounter++)<br />
                                        {<br />
                                            int tempRecivedByte = serialPort1.ReadByte();<br />
                                            comBuffer[msgByteCounter + BytesCounter] = (byte)tempRecivedByte;<br />
                                            if (msgByteCounter == messageLength - 1)<br />
                                            {<br />
                                                #region check if message end equal '0d'='13'<br />
                                                if (tempRecivedByte == 13)<br />
                                                {<br />
<br />
                                                    string range1 = Conversion.Hex(comBuffer[msgByteCounter + BytesCounter - 6]); //3<br />
                                                    string range2 = Conversion.Hex(comBuffer[msgByteCounter + BytesCounter - 5]); //4<br />
                                                    string contactRange = string.Concat(range2, range1);<br />
                                                    range = Convert.ToInt32(contactRange, 16);<br />
<br />
                                                    string azmouth1 = Conversion.Hex(comBuffer[msgByteCounter + BytesCounter - 4]); //5<br />
                                                    string azmouth2 = Conversion.Hex(comBuffer[msgByteCounter + BytesCounter - 3]); //6<br />
                                                    string contactazmouth = string.Concat(azmouth2, azmouth1);<br />
                                                    azmouth = Convert.ToInt32(contactazmouth, 16);<br />
<br />
                                                }<br />
                                                #endregion<br />
                                            }<br />
                                        }<br />
                                        //Add range and Azmouth to arrayList.<br />
                                        MessageContents msgcontents = new MessageContents(range, azmouth);<br />
                                       //   msgcontents.MsgRang = range;<br />
                                        msgSequence.Add(msgcontents);<br />
<br />
                                       // msgcontents.Azmouth = azmouth;<br />
                                        //msgSequence.Add(msgcontents.Azmouth);<br />
<br />
                                        // Set the value of MsgSequence to be acessed when i want to draw.<br />
                                      //  MsgSequence = msgSequence;<br />
<br />
                                    } // end of if satement Scope<br />
                                }<br />
                            }<br />
                            #endregion<br />
<br />
                            #region Check if messageLength == 12<br />
                            else if (messageLength == 12)<br />
                            {<br />
                                //to Check if message length which reads in second byte are like the exists in serial port.<br />
                                if (BytesCounter + messageLength <= bytesLength)<br />
                                {<br />
                                    for (int msgByteCounter = 2; msgByteCounter < messageLength; msgByteCounter++)<br />
                                    {<br />
                                        int tempRecivedByte = serialPort1.ReadByte();<br />
                                        comBuffer[msgByteCounter + BytesCounter] = (byte)tempRecivedByte;<br />
                                        if (msgByteCounter == messageLength - 1)<br />
                                        {<br />
                                            //check if message end equal '0d'='13'<br />
                                            if (tempRecivedByte == 13)<br />
                                            {<br />
                                            }<br />
                                        }<br />
                                    }<br />
                                }<br />
                            }<br />
                            #endregion<br />
<br />
                            if (messageLength + BytesCounter < comBuffer.Length)<br />
                                BytesCounter += messageLength - 1;<br />
                        }<br />
                        else<br />
                        {<br />
                            // ignore message<br />
                        }<br />
<br />
                            #endregion<br />
                    }<br />
                    #endregion<br />
                    // else<br />
                    #region do not read if first bytes not equal 99<br />
                    else<br />
                    {<br />
<br />
                    }<br />
                    #endregion<br />
                }<br />
                #endregion<br />
            }<br />
            catch (Exception ex)<br />
            {<br />
                MessageBox.Show(ex.Message);<br />
<br />
            }<br />
        }<br />
        #endregion<br />
<br />
        #region used to Recive Data In Run Time <br />
        public void DataRecivedInRunTime()<br />
        {<br />
<br />
            serialPort1.DataReceived += new SerialDataReceivedEventHandler(DataRecived);<br />
<br />
        }<br />
        #endregion<br />
<br />
        #region DataRecived Event<br />
        public void DataRecived(object sender, SerialDataReceivedEventArgs e)<br />
        {<br />
            //---invoke the delegate to retrieve the received data---<br />
            txtDataRecived.BeginInvoke(new myDelegate(updateTextBox));<br />
        }<br />
        #endregion<br />
    }<br />
}<br />
<br />

and MessageContents class to set range and azimuth on it

<br />
class MessageContents<br />
    {<br />
       <br />
        public double msgRang;<br />
        public double azmouth;<br />
<br />
      public  MessageContents(double _msgRang,double _azmouth)<br />
        {<br />
            this.msgRang=_msgRang;<br />
            this.azmouth = _azmouth;<br />
        }<br />
    }<br />

in the form
----------------------------

<br />
using System;<br />
using System.Collections.Generic;<br />
using System.ComponentModel;<br />
using System.Data;<br />
using System.Drawing;<br />
using System.Linq;<br />
using System.Text;<br />
using System.Windows.Forms;<br />
using System.Collections;<br />
using System.Drawing.Drawing2D;<br />
using System.Threading;<br />
<br />
namespace SerialPort16_5_2010<br />
{<br />
    public partial class Form1 : Form<br />
    {<br />
<br />
        ReviceDataFromSeriaLPort rcvfrmSerial;<br />
        ArrayList sequenceSore10 = new ArrayList();<br />
        int x, y;<br />
        public Form1()<br />
        {<br />
            InitializeComponent();<br />
        }<br />
        private void Form1_Load(object sender, EventArgs e)<br />
        {<br />
<br />
            rcvfrmSerial = new ReviceDataFromSeriaLPort();<br />
            //Connect to my Serial Port<br />
            rcvfrmSerial.ConnectToSerialPort("COM1", lblMessage);<br />
            // Recive Data From Other Com<br />
            rcvfrmSerial.txtDataRecived = textBox1;<br />
            rcvfrmSerial.DataRecivedInRunTime();<br />
        }<br />
<br />
    <br />
<br />
        private void myCustomPanel1_Paint_1(object sender, PaintEventArgs e)<br />
        {<br />
            Graphics g = Graphics.FromHwnd(myCustomPanel1.Handle);<br />
            Pen p = new Pen(new SolidBrush(Color.Red), 2.0f);<br />
<br />
                     g.TranslateTransform(400, 300);<br />
            foreach (MessageContents item in rcvfrmSerial.msgSequence)<br />
            {<br />
                double range = item.msgRang / 100;<br />
                double azimouth = item.azmouth;<br />
                double range2 = item.msgRang + 1;<br />
                x = (int)(range * Math.Cos(azimouth * Math.PI / 180));<br />
                y = (int)(range * Math.Sin(azimouth * Math.PI / 180));<br />
                g.DrawEllipse(p, (int)x, (int)y, 4, 4);<br />
                //g.DrawLine(p, 0, 0, x, y);<br />
                this.Invalidate();<br />
                this.Refresh();<br />
<br />
            }<br />
        }<br />
    }<br />
}<br />
<br />

Luc Pattyn8-Jun-10 6:28

8-Jun-10 6:28

Hi,

I've been trying to read some of that code, which you made very hard by not using PRE tags. PRE tags exist for preserving formatting, mainly indentation, which facilitates seeing the structure of it all. So whatever you do in future, use PRE tags. You could even still edit your existing message and put PRE tags around its code.

The code itself looks horrible too. Here are some comments, the list is not complete:

1.
using Exception.Message rather than Exception.ToString() is stupid, as the latter offers much more information, making debugging a lot easier.

2.
You have a DataReceived event handler (fine), but all it does is use Invoke to force a delegate to execute on the GUI thread, so it actually is your GUI thread that will read all bytes from the serial port and interpret them. That is not smart, as it has no relation with the GUI at all. You should deal with the serial data in a handler (or a separate thread) and only invoke towards the GUI thread at the very moment you want to update the GUI.

3.
you read all serial port data one byte at a time; why not use SerialPort.Read(byte[] buffer, int offset, int count) to read all available data at once, then process it?

4.
you have lots of unnecessary conversions, from bytes to strings to ints and back. As your data is binary (I assume so, since you are reading bytes right now), why not always deal with it as bytes; and possibly once turning it into a string for displaying it if necessary.

5.
Get rid of those silly Conversion.Hex calls; they reek like Basic. If at all necessary, simply use byte.ToString("X2")

6.
I skipped some code, then saw a Paint method, with lots of mistakes.
A. use the Graphics you get from PaintEventArgs, don't create your own
B. don't call Invalidate() or Refresh() in a Paint handler. It is terribly wrong.
C. Avoid calling methods such as Math.Cos in a paint handler; you should have done that calculation beforehand and store it in your objects.
D. Dispose of the garbage you create; e.g. the pen

Conclusion: it is an abominable mess; I don't want to have another look at it, it should be binned and started all over.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

I only read formatted code with indentation, so please use PRE tags for code snippets.

I'm not participating in frackin' Q&A, so if you want my opinion, ask away in a real forum (or on my profile page).

Honeyboy_2010-Jun-10 2:15

10-Jun-10 2:15

I have some comment on your reply ....

First, you say : you read all serial port data one byte at a time; why not use SerialPort.Read(byte[] buffer, int offset, int count) to read all available data at once, then process it?

I am check message from stream of bytes so I don't need to read all bytes then check it so I read byte by byte.

Second , I need to draw each plot once I catch valid message and update it on the screen ... what is the alternative way to use anything rather than refresh()

Luc Pattyn10-Jun-10 2:31

10-Jun-10 2:31

1. I expect 10 ReadByte() to take longer than a single Read() reading 100 bytes.

2.
Invalidate() and Refresh() don't belong inside a Paint handler; a Paint handler should paint, be swift and not cause other things to happen.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

I only read formatted code with indentation, so please use PRE tags for code snippets.

I'm not participating in frackin' Q&A, so if you want my opinion, ask away in a real forum (or on my profile page).

C# programm merging pdf files

Ahmed R El Bohoty14-Jun-10 17:43

Ahmed R El Bohoty

14-Jun-10 17:43

use onPaint event and it will solve your problem.

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--------------------------------
Discover Other ....
http://www.islamHouse.com

nstk6-Jun-10 6:39

nstk

6-Jun-10 6:39

Hallo, I am looking for a tiny but great programm which merges pdf files. I used it some years ago for joining over 1000 of small pdf files into a big one. Unfortunately, I do not remember its name, but I remember it was written in C# and the source code was given as well. I cannot find it, nor any that great to do my job with many pdf files. Upon running it promted the user to make a few decisions using a simple GUI, almost a Message Box. I would very much apprexiate any help. Thanks.

Re: C# programm merging pdf files

Richard MacCutchan6-Jun-10 6:51

Richard MacCutchan

6-Jun-10 6:51

This[^] may not be the exact answer you are looking for but it should help.

It's time for a new signature.

Re: C# programm merging pdf files

dan!sh 6-Jun-10 7:18

dan!sh

6-Jun-10 7:18

Not sure about the source code thing, but PDF metamorphosis is written in C#. Check if that is what you are looking for.

Re: C# programm merging pdf files

Johnny J.6-Jun-10 23:37

Johnny J.

6-Jun-10 23:37

There are a couple of projects here on CP that looks like they might be helpful to you:

PDF Merge[^]

Simple .NET PDF Merger[^]

Good luck

BTW: Don't ask me how I got the links... D'Oh! | :doh:

Getting cookies from IE process. [modified]

Evgeni575-Jun-10 20:19

Evgeni57

5-Jun-10 20:19

Hi all,

I need to get cookies which currently in use with one of my browsers (IE8), but IE doesn't log it into cookie text file.
I'm looking for cookies in "C:\Users\username\AppData\Roaming\Microsoft\Windows\Cookies" folder in username@hostname[i].txt file.
And in "C:\Users\username\AppData\Roaming\Microsoft\Windows\Cookies\Low" folder.
How I can do it?

Reading of non-persistent cookies is what I actualy need. Is there any way to do it?

thanks!

modified on Sunday, June 6, 2010 3:01 AM

Get object count

ruknil5-Jun-10 9:39

ruknil

5-Jun-10 9:39

This is what I have done to identify the vehicles from a given picture using Emgu CV (StructuringElementEx). Now I want to get the count of these identified vehicles.
If anyone know how to do that, it is a great help to me.
Thank You.

[img]http://i48.tinypic.com/2r2vza1.jpg[/img]

namespace ImagePrjct<br />
{<br />
    public partial class Form1 : Form<br />
    {<br />
        public Form1()<br />
        {<br />
            InitializeComponent();<br />
        }<br />
<br />
        private void Form1_Load(object sender, EventArgs e)<br />
        {<br />
            imageBox2.Image = new Image<Bgr, Byte>(@"C:\Users\Rukshan\Desktop\FYP_Update 2.1\New_Traffic_Pics\E4.jpg");<br />
        }<br />
<br />
        private void button1_Click(object sender, EventArgs e)<br />
        {<br />
            Image<Bgr, Byte> ori = new  Image<Bgr, Byte> ( imageBox2.Image.Bitmap);<br />
            Image<Gray, Byte> grayscale = ori.Convert<Gray, Byte>();<br />
            imageBox1.Image = grayscale;<br />
        }<br />
<br />
        private void button2_Click(object sender, EventArgs e)<br />
        {<br />
            Image<Bgr, Byte> ori = new  Image<Bgr, Byte> ( imageBox2.Image.Bitmap);<br />
            Image<Gray, Byte> grayscale = ori.Convert<Gray, Byte>();<br />
            //blk._Dilate(3);<br />
            //blk._Erode(3);<br />
           Image<Gray, Byte> thresh = grayscale.ThresholdToZero(new Gray(210));// (new Gray(50), new Gray(255));<br />
            //using (Image<Gray, Byte> plateCanny = thresh.Canny(new Gray(100), new Gray(50)))<br />
<br />
           StructuringElementEx ex = new StructuringElementEx(8, 8, 1, 1, CV_ELEMENT_SHAPE.CV_SHAPE_RECT);<br />
<br />
           thresh._MorphologyEx(ex, CV_MORPH_OP.CV_MOP_OPEN, 1);<br />
<br />
            imageBox3.Image = thresh;<br />
        }

Rendering a page break in WinForms RichTextBox

The Man from U.N.C.L.E.5-Jun-10 9:06

The Man from U.N.C.L.E.

5-Jun-10 9:06

I have a project that integrates RichTextBox tips from many articles across the web. Everything from XP Style borders, to WYSIWYG printing.

One thing missing is rendering of page breaks.

I can insert an RTF page break that is visible when loading the resulting rtf file into Word, or similar. However I can't find how to render it inside the RichTextBox.

I would like to render a nice dotted line at that point.

So far my searches have only turned up print rendering articles, which I already have.
Any suggestions or links to appropriate aticles would be welcome.

If you have knowledge, let others light their candles at it.
Margaret Fuller (1810 - 1850)
[My Articles] [My Website]

Re: Rendering a page break in WinForms RichTextBox

Luc Pattyn5-Jun-10 10:24

Re: Rendering a page break in WinForms RichTextBox

5-Jun-10 10:24

This is what I know about the matter, mostly from reading the RTF specification and from experimenting (I did quite some work on tables, perfectly readable in WordPad):

- there are hundreds of RTF commands;
- Word can create RTF documents, and will use a lot of the existing commands;
- WordPad can create RTF documents, and will use only few of the existing commands;
- WordPad can show a lot of RTF stuff it does not let you create interactively;
- RichTextBox shows RTF documents pretty much the same as WordPad does.
- RTF has a \page command
- WordPad shows it as an empty line

From that I would conclude:
- by default RTB hardly renders a page command
- you can of course add whatever text and formatting code you like whenever you also insert a page command; that is after all what Word does when it creates headers and footers for you.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

I only read formatted code with indentation, so please use PRE tags for code snippets.

I'm not participating in frackin' Q&A, so if you want my opinion, ask away in a real forum (or on my profile page).

The Man from U.N.C.L.E.5-Jun-10 11:10

The Man from U.N.C.L.E.

5-Jun-10 11:10

Thanks Luc

I am using the \page command and it works fine when printing or loading into Word, just no visual cue in the RichTextBox. I hadn't realised WordPad did nothing to indicate the page break. If Microsoft left it out of WordPad I don't feel so bad about not implementing it myself.
I guess the simplest solution will be for me to insert a horizontal line in place of any page breaks and replace them with real page breaks on save.

If you have knowledge, let others light their candles at it.
Margaret Fuller (1810 - 1850)
[My Articles] [My Website]

Re: Rendering a page break in WinForms RichTextBox

Luc Pattyn5-Jun-10 11:36

Problem with Listview,help!

5-Jun-10 11:36

You're welcome.

The Man from U.N.C.L.E. wrote:
insert a horizontal line ... and replace them

That sounds OK. Whatever you want to achieve, it probably can be done, but you'll have to manipulate the RTF string yourself.

FYI: as always, the document Word generates is overly complex; WordPad does a much better job, assuming it allows you to enter what you need. When working with tables, I looked at what Word does, read the RTF specs, and created it all in code, I didn't want hundreds of lines of initialization (and it gets worse in every new Office version).

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

I only read formatted code with indentation, so please use PRE tags for code snippets.

I'm not participating in frackin' Q&A, so if you want my opinion, ask away in a real forum (or on my profile page).

imbiz5-Jun-10 7:31

imbiz

5-Jun-10 7:31

The structure of my listview is:

             Select    ID    Name         Age
--------------------------------------------------
Item[0]:    checkbox   25    Richard       24
Item[1]:    checkbox   26    Tom           20
Item[2]:    checkbox   27    Alice         22
......many.....

Now, I want to get the name or age of current item when I make the item checked or unchecked. In other words, when I click a checkbox, I need to know the index of the item. If there is only one checked item, we can use "foreach" to get the index, but there are some already checked items.For example:

Item[0] and Item[1] are checked.
I click the checkbox of Item[2], How can I know what I clicked is Item[2]? (Here is not related to SelectedItem.)

Excuse me,My English is poor. Wink | ;)

Re: Problem with Listview,help!

Henry Minute5-Jun-10 8:05

Henry Minute

5-Jun-10 8:05

You need to handle the ItemCheck event of your ListView.

The event handler skeleton inserted for you by the IDE has an ItemCheckEventArgs which contains, amongst other things, the index of the checked item and its current state (checked/unchecked). You can use this information to decide what to do.

Henry Minute

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Re: Problem with Listview,help!

Luc Pattyn5-Jun-10 8:07