C# Read random line - C# Discussion Boards

Kevin Marois29-Mar-17 4:15

29-Mar-17 4:15

If I understand what you're saying.. it would mean creating the thread and error handling INSIDE the service classes, correct?

If so, it puts the responsibility on individual developers to follow the pattern to make it work.

Classes implementing IService only really need to have some basic info (Id, Name) and Start and Stop methods that the Windows Service can call into.

Am I understanding what you're saying here?

If it's not broken, fix it until it is.
Everything makes sense in someone's mind.
Ya can't fix stupid.

Re: Scheduled Services Architecture

Kevin Marois29-Mar-17 4:19

Kevin Marois

29-Mar-17 4:19

Can you provide a small example to illustrate what you're saying here?

If it's not broken, fix it until it is.
Everything makes sense in someone's mind.
Ya can't fix stupid.

Handle Exception In Thread

Kevin Marois27-Mar-17 9:35

Kevin Marois

27-Mar-17 9:35

I'm creating a class instance using Activator.CreateInstance

var serviceClass = Activator.CreateInstance(type) as IInstrumentService;
_services.Add(serviceClass);

Then, later, I start each service. I want to catch any exceptions that occur in the service class. I was thinking about something like

private void StartAllServices()
{
    foreach (var service in _services)
    {
        Task.Factory.StartNew(() =>
        {
            service.Start();

        }).ContinueWith(task =>
        {
            if (task.Exception != null)
            {
                // Handle the exception here
            }
        });
    }
}

Any reason this would not work? Know of a better way to do this?

Thanks

If it's not broken, fix it until it is.
Everything makes sense in someone's mind.
Ya can't fix stupid.

Re: Handle Exception In Thread

Rob Philpott28-Mar-17 0:01

Rob Philpott

28-Mar-17 0:01

Hi Kevin,

So does your service have a Stop() method as well? Normally a start method would be kind of asynchronous in nature, kicking off its own threads, opening network listeners and that sort of thing, so the test you have there looks like it would catch exceptions in just that part.

Or is it that Start() method is more of a Run()? By which I means it runs until completion, possibly days later?

A good catch all would be this (lifted from Visual Studio right in front of me):

// catch any unhandled exceptions
AppDomain.CurrentDomain.UnhandledException += CurrentDomainUnhandledException;

Regards,
Rob Philpott.

Re: Handle Exception In Thread

Kevin Marois28-Mar-17 5:55

Kevin Marois

28-Mar-17 5:55

Yes, the services have a Stop method. The services are independent of each other. They can each do entirely different things.

There will be a schedule in place that each services runs under. One may run only once, while another may run regularly at different days & times.

If it's not broken, fix it until it is.
Everything makes sense in someone's mind.
Ya can't fix stupid.

Re: Handle Exception In Thread

Nathan Minier28-Mar-17 1:35

Nathan Minier

28-Mar-17 1:35

Just a quick note:

Passing a cancellation token to the Task.Factory.StartNew() will give you an external control for your child tasks.

Otherwise I've been playing with the same construct for a component host (except that I hydrate my components via a MEF ImportMany) and it works very well.

"There are three kinds of lies: lies, damned lies and statistics."
- Benjamin Disraeli

Re: Handle Exception In Thread

Richard Deeming28-Mar-17 1:43

Richard Deeming

28-Mar-17 1:43

The as operator can return null. If you're not sure whether the type implements the interface, you should check for null before you add the service to the list. If you are sure, or you want an exception if it doesn't, then switch to using a cast instead:

var serviceClass = Activator.CreateInstance(type) as IInstrumentService;
if (serviceClass != null) _services.Add(serviceClass);

// Or:
var serviceClass = (IInstrumentService)Activator.CreateInstance(type);
_services.Add(serviceClass);

You could pass TaskContinuationOptions.OnlyOnFaulted, which would remove the need to test whether the task has an exception.

.ContinueWith(task =>
{
    // Handle the exception here
}, TaskContinuationOptions.OnlyOnFaulted);

Also, Task.Run is generally preferred over Task.Factory.StartNew:
Task.Run vs Task.Factory.StartNew | Parallel Programming with .NET[^]

Task.Run(() => service.Start()).ContinueWith(...

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

C# Read random line

Pavlex426-Mar-17 10:00

Pavlex4

26-Mar-17 10:00

How to read random line from text file that startswith * and lines below him that are related to him?

I have created to get random line with question using commands below, but after that it doesn't read lines below him that are related to him,instead of that he read lines from beggining!!!

var questions =
File.ReadLines(filePath)
.Where(line => line.StartsWith("*")).ToList();

var rng = new Random();
var myRandomQuestion = questions[rng.Next(questions.Count)].Substring(1);
label1.Text = myRandomQuestion;

My text file has 15000 lines.Lines with * character are questions and lines below them are terms relating to that question.

This is one part of file:

*Planete i njihovi sateliti
Zemlja=Mesec
Mars=Fobos
Jupiter=Io
Saturn=Titan
Uran=Titania
Neptun=Triton
Pluton=Haron
Merkur=Nema satelit

*Čuveni parovi iz umetnosti
Hamlet=Ofelija
Ruslan=Ljudmila
Zevs=Hera
Otelo=Dezdemona
Paris=Helena
Abelard=Eloiza
Paolo=Frančeska
Lanselot=Ginevra

*Latinski pojmovi
Kvalifikacija=Osposobljenost
Karantin=Izolacija
Radijacija=Zračenje
Ratifikacija=Potpisivanje
Racionalan=Razuman
Reakcija=Otpor
Realizacija=Ostvarenje
Rekapitulacija=Ponavljanje

*Poveži aktuelne predsednike sa državama u kojima vladaju.
Trajan Basesku=Rumunija
Karolos Papuljas=Grčka
Đorđo Napolitano=Italija
Tomas Hendrik Ilves=Estonija
Danilo Tirk=Slovenija
Dimitris Hristofias=Kipar
Tarja Halonen=Finska
Meri Mekelis=Irska

*Francuski gradovi
Bordeaux=Bordo
Auxerre=Okser
Toulouse=Tuluz
Nantes=Nant
Marseille=Marselj
Dijon=Dižon
Limoges=Limož
Chateauroux=Šatero

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.Collections.Specialized;
using System.IO;
 
namespace Slagalica
{
    public partial class Spojnice : MetroFramework.Forms.MetroForm
    {
        public Spojnice()
        {
            InitializeComponent();
        }
 
        string igra;
        int j = 0;
        Button[] button;
        private void Spojnice_Load(object sender, EventArgs e)
        {
            Random r = new Random();
            int indeks;
            igra = "spojnice";
            StreamReader sr = new StreamReader(igra + ".txt");
            string[] niz1 = new string[8];
            string[] niz2 = new string[8];
 
            //label1.Text = sr.ReadLine();
 
            var questions = File.ReadLines(igra + ".txt").Where(line => line.StartsWith("*")).ToList();
            var myRandomQuestion = questions[r.Next(questions.Count)].Substring(1);
            label1.Text = myRandomQuestion;
 
            button = new Button[] { button1, button2, button3, button4, button5, button6, button7, button8
            ,button9, button10, button11, button12, button13, button14, button15, button16 };
            for (int i = 0; i < 8; i++)
            {
                string s = sr.ReadLine();
                niz1[i] = s.Substring(0, s.IndexOf('='));
                indeks = r.Next(1, 9);
                bool ind = true;
                while (ind)
                {
                    ind = false;
                    switch (indeks)
                    {
                        case 1:
                            if (button9.Text == "")
                                button9.Text = s.Substring(s.IndexOf('=') + 1);
                            else
                            {
                                indeks = r.Next(1, 9);
                                ind = true;
                            }
                            break;
                        case 2:
                            if (button10.Text == "")
                                button10.Text = s.Substring(s.IndexOf('=') + 1);
                            else
                            {
                                indeks = r.Next(1, 9);
                                ind = true;
                            }
                            break;
                        case 3:
                            if (button11.Text == "")
                                button11.Text = s.Substring(s.IndexOf('=') + 1);
                            else
                            {
                                indeks = r.Next(1, 9);
                                ind = true;
                            }
                            break;
                        case 4:
                            if (button12.Text == "")
                                button12.Text = s.Substring(s.IndexOf('=') + 1);
                            else
                            {
                                indeks = r.Next(1, 9);
                                ind = true;
                            }
                            break;
                        case 5:
                            if (button13.Text == "")
                                button13.Text = s.Substring(s.IndexOf('=') + 1);
                            else
                            {
                                indeks = r.Next(1, 9);
                                ind = true;
                            }
                            break;
                        case 6:
                            if (button14.Text == "")
                                button14.Text = s.Substring(s.IndexOf('=') + 1);
                            else
                            {
                                indeks = r.Next(1, 9);
                                ind = true;
                            }
                            break;
                        case 7:
                            if (button15.Text == "")
                                button15.Text = s.Substring(s.IndexOf('=') + 1);
                            else
                            {
                                indeks = r.Next(1, 9);
                                ind = true;
                            }
                            break;
                        case 8:
                            if (button16.Text == "")
                                button16.Text = s.Substring(s.IndexOf('=') + 1);
                            else
                            {
                                indeks = r.Next(1, 9);
                                ind = true;
                            }
                            break;
                    }
                }
            }
           
            for (j = 0; j < 8; j++)
                button[j].Text = niz1[j];
            for (j = 0; j < 16; j++)
                button[j].BackColor = Color.DodgerBlue;
 
           label1.BackColor = Color.DodgerBlue;
            timer1.Enabled = true;
        }
 
        int ukupno = 0, pojam = 0;
 
        private void RacunajZaDugme(Button dugme1, Button dugme2, string igr)
        {
            string s1 = dugme1.Text + "=" + dugme2.Text;
            StreamReader sr = new StreamReader(igr + ".txt");
            string s2 = sr.ReadLine();
            while (!sr.EndOfStream)
            {
                s2 = sr.ReadLine();
                if (s1 == s2)
                {
                    ukupno += 4;
                    dugme1.BackColor = Color.Green;
                    dugme2.BackColor = Color.Green;
                    break;
                }
                if (s1 != s2)
                {
                    dugme1.BackColor = Color.Red;
                }
            }
            pojam++;
            if (pojam == 8)
            {
                KrajIgre();
                pojam = 0;
                ukupno = 0;
            }
        }
 
        private void KrajIgre()
        {
            timer1.Enabled = false;
 
            button = new Button[] { button1, button2, button3, button4, button5, button6, button7, button8
            ,button9, button10, button11, button12, button13, button14, button15, button16 };
            for (j = 0; j < 16; j++)
                button[j].BackColor = Color.White;
            for (j = 0; j < 16; j++)
                button[j].Text = "";
 
            MessageBox.Show("Osvojili ste " + ukupno + " poena ! ! !", "Kraj igre");
 
            label1.Text = "";
            label1.BackColor = Color.DarkBlue;
        }
 
        int i;
 
        private void button2_Click(object sender, EventArgs e)
        {
            i = 2;
        }
 
        private void button3_Click(object sender, EventArgs e)
        {
            i = 3;
        }
 
        private void button4_Click(object sender, EventArgs e)
        {
            i = 4;
        }
 
        private void button5_Click(object sender, EventArgs e)
        {
            i = 5;
        }
 
        private void button6_Click(object sender, EventArgs e)
        {
            i = 6;
        }
 
        private void button7_Click(object sender, EventArgs e)
        {
            i = 7;
        }
 
        private void button8_Click(object sender, EventArgs e)
        {
            i = 8;
        }
 
        private void button9_Click(object sender, EventArgs e)
        {
            switch (i)
            {
                case 1:
                    RacunajZaDugme(button1, button9, igra);
                    break;
                case 2:
                    RacunajZaDugme(button2, button9, igra);
                    break;
                case 3:
                    RacunajZaDugme(button3, button9, igra);
                    break;
                case 4:
                    RacunajZaDugme(button4, button9, igra);
                    break;
                case 5:
                    RacunajZaDugme(button5, button9, igra);
                    break;
                case 6:
                    RacunajZaDugme(button6, button9, igra);
                    break;
                case 7:
                    RacunajZaDugme(button7, button9, igra);
                    break;
                case 8:
                    RacunajZaDugme(button8, button9, igra);
                    break;
            }
        }
 
        private void button10_Click(object sender, EventArgs e)
        {
            switch (i)
            {
                case 1:
                    RacunajZaDugme(button1, button10, igra);
                    break;
                case 2:
                    RacunajZaDugme(button2, button10, igra);
                    break;
                case 3:
                    RacunajZaDugme(button3, button10, igra);
                    break;
                case 4:
                    RacunajZaDugme(button4, button10, igra);
                    break;
                case 5:
                    RacunajZaDugme(button5, button10, igra);
                    break;
                case 6:
                    RacunajZaDugme(button6, button10, igra);
                    break;
                case 7:
                    RacunajZaDugme(button7, button10, igra);
                    break;
                case 8:
                    RacunajZaDugme(button8, button10, igra);
                    break;
            }
        }
 
        private void button11_Click(object sender, EventArgs e)
        {
            switch (i)
            {
                case 1:
                    RacunajZaDugme(button1, button11, igra);
                    break;
                case 2:
                    RacunajZaDugme(button2, button11, igra);
                    break;
                case 3:
                    RacunajZaDugme(button3, button11, igra);
                    break;
                case 4:
                    RacunajZaDugme(button4, button11, igra);
                    break;
                case 5:
                    RacunajZaDugme(button5, button11, igra);
                    break;
                case 6:
                    RacunajZaDugme(button6, button11, igra);
                    break;
                case 7:
                    RacunajZaDugme(button7, button11, igra);
                    break;
                case 8:
                    RacunajZaDugme(button8, button11, igra);
                    break;
            }
        }
 
        private void button12_Click(object sender, EventArgs e)
        {
            switch (i)
            {
                case 1:
                    RacunajZaDugme(button1, button12, igra);
                    break;
                case 2:
                    RacunajZaDugme(button2, button12, igra);
                    break;
                case 3:
                    RacunajZaDugme(button3, button12, igra);
                    break;
                case 4:
                    RacunajZaDugme(button4, button12, igra);
                    break;
                case 5:
                    RacunajZaDugme(button5, button12, igra);
                    break;
                case 6:
                    RacunajZaDugme(button6, button12, igra);
                    break;
                case 7:
                    RacunajZaDugme(button7, button12, igra);
                    break;
                case 8:
                    RacunajZaDugme(button8, button12, igra);
                    break;
            }
        }
 
        private void button13_Click(object sender, EventArgs e)
        {
            switch (i)
            {
                case 1:
                    RacunajZaDugme(button1, button13, igra);
                    break;
                case 2:
                    RacunajZaDugme(button2, button13, igra);
                    break;
                case 3:
                    RacunajZaDugme(button3, button13, igra);
                    break;
                case 4:
                    RacunajZaDugme(button4, button13, igra);
                    break;
                case 5:
                    RacunajZaDugme(button5, button13, igra);
                    break;
                case 6:
                    RacunajZaDugme(button6, button13, igra);
                    break;
                case 7:
                    RacunajZaDugme(button7, button13, igra);
                    break;
                case 8:
                    RacunajZaDugme(button8, button13, igra);
                    break;
            }
        }
 
        private void button14_Click(object sender, EventArgs e)
        {
            switch (i)
            {
                case 1:
                    RacunajZaDugme(button1, button14, igra);
                    break;
                case 2:
                    RacunajZaDugme(button2, button14, igra);
                    break;
                case 3:
                    RacunajZaDugme(button3, button14, igra);
                    break;
                case 4:
                    RacunajZaDugme(button4, button14, igra);
                    break;
                case 5:
                    RacunajZaDugme(button5, button14, igra);
                    break;
                case 6:
                    RacunajZaDugme(button6, button14, igra);
                    break;
                case 7:
                    RacunajZaDugme(button7, button14, igra);
                    break;
                case 8:
                    RacunajZaDugme(button8, button14, igra);
                    break;
            }
        }
 
        private void button15_Click(object sender, EventArgs e)
        {
            switch (i)
            {
                case 1:
                    RacunajZaDugme(button1, button15, igra);
                    break;
                case 2:
                    RacunajZaDugme(button2, button15, igra);
                    break;
                case 3:
                    RacunajZaDugme(button3, button15, igra);
                    break;
                case 4:
                    RacunajZaDugme(button4, button15, igra);
                    break;
                case 5:
                    RacunajZaDugme(button5, button15, igra);
                    break;
                case 6:
                    RacunajZaDugme(button6, button15, igra);
                    break;
                case 7:
                    RacunajZaDugme(button7, button15, igra);
                    break;
                case 8:
                    RacunajZaDugme(button8, button15, igra);
                    break;
            }
        }
 
        private void button16_Click(object sender, EventArgs e)
        {
            switch (i)
            {
                case 1:
                    RacunajZaDugme(button1, button16, igra);
                    break;
                case 2:
                    RacunajZaDugme(button2, button16, igra);
                    break;
                case 3:
                    RacunajZaDugme(button3, button16, igra);
                    break;
                case 4:
                    RacunajZaDugme(button4, button16, igra);
                    break;
                case 5:
                    RacunajZaDugme(button5, button16, igra);
                    break;
                case 6:
                    RacunajZaDugme(button6, button16, igra);
                    break;
                case 7:
                    RacunajZaDugme(button7, button16, igra);
                    break;
                case 8:
                    RacunajZaDugme(button8, button16, igra);
                    break;
            }
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            i = 1;
        }
    }
}

Re: C# Read random line

Dave Kreskowiak26-Mar-17 12:52

Dave Kreskowiak

26-Mar-17 12:52

I'm not reading that entire code dump. Most of is probably not related to the problem.

You can't randomly seek to a specific "line" in a text file. You have to read through it, looking for the lines that start with "*". You can do ignore a random number of them but you might want to initialize some structure with the data from the file, reading through the entire file looking for the "*" lines and recording which line you found it. You can then pick one at random, and get the line number to skip to. You have to go back re-read the file, counting lines until you get to the one you want.

When you get the line with the "*" in it, you start reading and recording the data from each line, these are your answers, until you get to another line with a "*" in it.

A guide to posting questions on CodeProject

Click this: Asking questions is a skill.
Seriously, do it.

Dave Kreskowiak

Re: C# Read random line

Garth J Lancaster26-Mar-17 13:50

Garth J Lancaster

26-Mar-17 13:50

I would have approached this issue 'a bit differently' - it depends if you want to have to whole file in memory, or what you wish to optimise ...

Assuming you dont want the whole file in memory, you read the file multiple times

In the OnLoad event for the WinForm, I would fire off a Background thread, to parse the file to extract all the questions, their start lines in the file, the number of answers, to a data structure - possible an array of struct(string question, int start line, int num answers) - this is your 'index'

once you have a random number, you get that element from the index and use the start line and num answers to locate the answers in the file

If you can keep the entire set of data in memory, then you parse the file to something like array of struct(string question, List<string> answers), which means once you have your random number, you can jump straight to the index and get the question and answers

Re: C# Read random line

OriginalGriff26-Mar-17 21:37

OriginalGriff

26-Mar-17 21:37

I would suggest that the best thing to do would be to change your file format.
If you used each line to hold a single question, together with it's possible answers, separated by '|' characters:

Planete i njihovi sateliti|Zemlja=Mesec|Mars=Fobos|Jupiter=Io|Saturn=Titan|Uran=Titania|Neptun=Triton|Pluton=Haron|Merkur=Nema satelit
Čuveni parovi iz umetnosti|Hamlet=Ofelija|Ruslan=Ljudmila|Zevs=Hera|Otelo=Dezdemona|Paris=Helena|Abelard=Eloiza|Paolo=Frančeska|Lanselot=Ginevra
...

Then the problem becomes trivial:
Use File.ReadAllLines to read the whole file into an array of strings: each element of the array is a question together with it's answers, so selecting a random question is a trivial use of the Random class.
Each question and answer can be easily split out into an array of strings using string.Split - the first element of the array is the question, the rest of them are possible answers.

But do yourself a favour: stop using Visual Studio default names for everything - you may remember that "TextBox8" is the mobile number today, but when you have to modify it in three weeks time, will you then? Use descriptive names - "tbMobileNo" for example - and your code becomes easier to read, more self documenting, easier to maintain - and surprisingly quicker to code because Intellisense can get to to "tbMobile" in three keystrokes, where "TextBox8" takes thinking about and 8 keystrokes...

Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...

Re: C# Read random line

Pavlex426-Mar-17 21:52

Pavlex4

26-Mar-17 21:52

How to change format?
My text file has 15000 lines!!!!

Re: C# Read random line

OriginalGriff26-Mar-17 22:12

OriginalGriff

26-Mar-17 22:12

Simple!
Write a quick app to do it for you. Something like this should do the donkey work:

private void ConvertFile(string inPath, string outPath)
    {
    string[] inData = File.ReadAllLines(inPath);
    List<string> outData = new List<string>();
    StringBuilder sb = new StringBuilder();
    foreach (string line in inData)
        {
        if (line.StartsWith("*"))
            {
            if (sb.Length > 0)
                {
                outData.Add(sb.ToString());
                sb.Clear();
                }
            sb.Append(line.Substring(1));
            }
        else
            {
            sb.Append("|");
            sb.Append(line);
            }
        }
    if (sb.Length > 0)
        {
        outData.Add(sb.ToString());
        }
    File.WriteAllLines(outPath, outData);
    }

Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...

Re: C# Read random line

Pavlex426-Mar-17 23:41

Pavlex4

26-Mar-17 23:41

I have added questions and answer to list!How to get random question with it's answers from the list?

string[] data = File.ReadAllLines("spojnice1.txt");
            List<string> questions = new List<string>();
            foreach (string line in data)
                questions.Add(line);

Re: C# Read random line

Pete O'Hanlon26-Mar-17 23:45

Pete O'Hanlon

26-Mar-17 23:45

You know the number of questions, so you should be easily able to use the Random class to pick the appropriate question. And I'm pretty sure that Griff recommended that you used a parent-child relationship so you added only the lines starting with * to the questions list, and then you would expose a list of answers as a child of the question.

This space for rent

Re: C# Read random line

Pavlex427-Mar-17 0:03

Pavlex4

27-Mar-17 0:03

He told me to change to this format text file:

Planete i njihovi sateliti|Zemlja=Mesec|Mars=Fobos|Jupiter=Io|Saturn=Titan|Uran=Titania|Neptun=Triton|Pluton=Haron|Merkur=Nema satelit
Čuveni parovi iz umetnosti|Hamlet=Ofelija|Ruslan=Ljudmila|Zevs=Hera|Otelo=Dezdemona|Paris=Helena|Abelard=Eloiza|Paolo=Frančeska|Lanselot=Ginevra
...

When I change to that format I cannot add lines starting with * to list!!!

Re: C# Read random line

Pete O'Hanlon27-Mar-17 0:07

Pete O'Hanlon

27-Mar-17 0:07

Sigh. Let me simplify this for you.

Griff has suggested that you break your original list down (the ones that originally started with * being your question). These then have a number of answers stored as a series of pipe delimited fields. That's your parent/child relationship there.

The lines originally marked with * will now be the first entry in this pipe delimited list.

You know how many entries you have in this list, so you use this as the upper bound of the Random number.

That's it - the code is trivial. To make things more random, don't forget to seed the Random when you instantiate it. Read the documentation for details on how to do this.

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Re: C# Read random line

Luc Pattyn27-Mar-17 11:15

Luc Pattyn

27-Mar-17 11:15

Hi,

if the majority of your application needs to know the file structure, then something is definitely wrong.
At the minimum you should define data structures that reflect the problem domain, read your file once, and stuff all the info into the data structures, then work from there.

However, I would also consider using a database; from what I understood you would need two tables: one for questions, one for the remaining info; and an N-to-1 relationship between them.

Smile | :)

Luc Pattyn [My Articles] Nil Volentibus Arduum

How can I create multi-threads application in which each thread have its own WebDriver to do its tasks?

khanhsk26-Mar-17 4:29

khanhsk

26-Mar-17 4:29

Hi all,
I am using Selenium ver 2.53.0, Firefox 46.0.1. I want to create an application that use Selenium WebDriver to do parallel tasks. I have created an app like that but: My app opened 2 webdrivers and its task was the same, not different task as I have assigned to each thread before. I wonder what was going on? Was there one-one connection between thread 1 - Webdriver 1 AND thread 2 - Webdriver 2 OR not? If not I suggest each thread was pushing its data to active Webdriver at that time. Was I right?
Hope to get any help from all of you, so I can solve my issue. Thank you!

Best Regards,
Sokhanh

Re: How can I create multi-threads application in which each thread have its own WebDriver to do its tasks?

Dave Kreskowiak26-Mar-17 4:49

Dave Kreskowiak

26-Mar-17 4:49

You don't provide the correct information to diagnose your problem.

But I will say that WebDriver is not thread-safe. You can't have multiple threads using the same WebDriver instance.

You CAN, however, have each thread create it's own instance of WebDriver, but each one of those is going to create it's own instance of the browser. This is going to greatly increase the amount of memory your app is using.

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Dave Kreskowiak

Re: How can I create multi-threads application in which each thread have its own WebDriver to do its tasks?

khanhsk26-Mar-17 23:49

khanhsk

26-Mar-17 23:49

So sorry if my question was not clear enough or did not have right information to diagnose my problem. But what I was trying to say is I want to create, for example, 2 threads and WebDriver instance of each one. Then, pass parameter (different task for each thread) to each thread. However, the two threads did not do its tasks, I did the same task of thread 2. I don't know what was wrong? I can describe the app I created as follow:
Main thread create 2 child threads: thread 1, thread 2
thread 1 -> create Webdriver 1 --> do task 1
thread 2 -> create Webdriver 2 --> do task 2
The problem is thread 1 and thread 2 --> do the same task 2

for (int n = 0; n < 2; n++)
         {
                    Thread myNewThread = new Thread(() => createNewThread(taskN));
                    myNewThread.Name = "[Thread " + n + "]";
                    myNewThread.Start();
                    Console.WriteLine("Thread {0} started\n\n", n);
       
         }  

public static void createNewThread(task)
         {
            // init driver
                FirefoxProfile prof = new FirefoxProfile();
                prof.SetPreference("browser.startup.homepage_override.mstone", "ignore");
                prof.SetPreference("startup.homepage_welcome_url", "about:blank");
                prof.SetPreference("startup.homepage_welcome_url.additional", "about:blank");
                prof.SetPreference("browser.startup.homepage", "about:blank");
                IWebDriver driver = new FirefoxDriver(prof);

            // do its task 
            doTask(driver, task);
            
            Console.WriteLine("Thread {0} completed!\n\n", Thread.CurrentThread.Name);
         }

Tech Soft

Visual Studio 2017 problems

zequion25-Mar-17 23:30

zequion

25-Mar-17 23:30

I installed Visual Studio 2017 a few days ago and for now I have 3 problems.

1.- After starting and stopping the project several times, when compiling appears the "Access Denied" indicating that do not have permissions in bin\Debug to copy the .exe file from obj\debug to bin\debug. The only thing that works is to go back to restart the pc. The .exe file not is in memory and unlocker does not indicate anything.

2.- I deleted the Debug directory but when compiling or recompiling the bin\Debug directory is not regenerated and error CS0246 appears because it does not find the references to the Dlls that i use in the project. Simply bin\debug remains empty.

SOLVED. Last minute: Solved. In the .csproj file there were several lines

modified 26-Mar-17 6:34am.

Re: Visual Studio 2017 problems

Michael_Davies26-Mar-17 0:11

Michael_Davies

26-Mar-17 0:11

Why not report it to Microsoft?

Re: Visual Studio 2017 problems

Richard MacCutchan26-Mar-17 1:37

Richard MacCutchan

26-Mar-17 1:37

This has nothing to do with C#, and is really an issue for Microsoft.

add members to a group

Member 1299778224-Mar-17 18:25

Member 12997782

24-Mar-17 18:25

Hi I am a beginner programmer and I want to developers and application where I register members and add members to a specific group example sport group,study group or prayer group etc

Please can you assist or tell me what tutorial I could read to learn this.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.