Threads and VS2005

This is a discussion on Threads and VS2005 within the C# Programming forums, part of the General Programming Boards category; Hey I'm trying to access a method which is on another class rather than the one the thread was created ...

  1. #1
    Registered User
    Join Date
    Apr 2007
    Posts
    32

    Threads and VS2005

    Hey I'm trying to access a method which is on another class rather than the one the thread was created on.. Now about the problem that I have to use delegates I fixed that infact the code works when i put the Print() message on the same class the thread is created on.

    I tried a lot of possibilities including extending the MessagePrinter class as a subclass of the Form.. Please can any1 help how to solve this problem? cos I'm really gonna need it in the near future

    In short all I want is to add text to a richtextbox via a thread which the method that does this is on another class.. The faulty code is shown below (with this i'm just getting the message "Starting Threads" in the rTextbox)

    the code for the Form class:

    Code:
    using System.Data;
    using System.Drawing;
    using System.Text;
    using System.Windows.Forms;
    using System.Threading;
    
    namespace CROSSTHREADING
    {
        public partial class Form1 : Form
        {        
                        
            public Form1()
            {
                InitializeComponent();                        
            
            }               
    
           
            public void SetText(string text)
            {
                if (this.richTextBox1.InvokeRequired)
                {
                    SetTextCallback d = new SetTextCallback(SetText);
                    this.Invoke(d, new object[] { text });               
                }
                else
                {
                    this.richTextBox1.Text += text + '\n';
                }
            }
    
    
            
            private void button1_Click(object sender, EventArgs e)
            {
                MessagePrinter printer1 = new MessagePrinter();
                Thread thread1 = new Thread(new ThreadStart(printer1.Print));
                Thread thread2 = new Thread(new ThreadStart(printer1.Print));
                Thread thread3 = new Thread(new ThreadStart(printer1.Print));
    
                
                thread1.Name = "thread1";
                thread2.Name = "thread2";
                thread3.Name = "thread3";
                this.SetText("Starting Threads");
                thread1.Start();
                thread2.Start();
                thread3.Start();
        
                
            }
    
          
            /* 
            //when i enable this method and call this method with the thread it works correctly
            public void Print()
            {
                sleepTime = random.Next(5001);
                Thread current = Thread.CurrentThread;
                SetText(current.Name + " going to sleep for " + sleepTime.ToString());
                //richTextBox1.Text = current.Name + " going to sleep for " + sleepTime.ToString();
                Thread.Sleep(sleepTime);
                SetText(current.Name + " done sleeping");
                current.Abort();
                //richTextBox1.Text = current.Name + " done sleeping";       
            }
             * */
              
           
                   
        }
    }
    and the code for the MessagePrinter class is shown below:

    Code:
    using System;
    using System.Collections.Generic;
    using System.Text;
    using System.Threading;
    
    namespace CROSSTHREADING
    {
        class MessagePrinter : Form1
        {
            private int sleepTime;
            private static Random random = new Random();
    
            public MessagePrinter()
            {
                sleepTime = random.Next(5001);
            }
    
            public void Print()
            {
                sleepTime = random.Next(5001);
                Thread current = Thread.CurrentThread;
                SetText(current.Name + " going to sleep for " + sleepTime.ToString());
                Thread.Sleep(sleepTime);
                SetText(current.Name + " done sleeping");
                current.Abort();
                     
            }
        }
    }
    Last edited by Cmaniac; 03-07-2008 at 01:56 AM.

  2. #2
    CSharpener vart's Avatar
    Join Date
    Oct 2006
    Location
    Rishon LeZion, Israel
    Posts
    6,471
    When you call SetText from your class - I do not see where it should direct the output...
    The first 90% of a project takes 90% of the time,
    the last 10% takes the other 90% of the time.

  3. #3
    Registered User
    Join Date
    Apr 2007
    Posts
    32
    do I have to use Singleton for example? sorry I'm kinda lost on this one

  4. #4
    the hat of redundancy hat nvoigt's Avatar
    Join Date
    Aug 2001
    Location
    Hannover, Germany
    Posts
    3,139
    Why do you have this extra class and why is it derived from your form ? Is it supposed to be another form ? If so, it probably needs to be shown. Maybe it just shouldn't be derived, but somehow get your form as parameter.
    hth
    -nv

    She was so Blonde, she spent 20 minutes looking at the orange juice can because it said "Concentrate."

    When in doubt, read the FAQ.
    Then ask a smart question.

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