Program not running in debug mode. but it runs without debug mode.

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i created simple threading program. it runs without debug mode. but start debugging mode it does not run.the program will crash every time. how to correct this

What I have tried:

i googled my problem.and i cant find any solution.

Code Try:

C#

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.Threading;


namespace thread_test_2
{
  public partial class Form1 : Form
  {
    Thread t;
    public Form1()
    {
       InitializeComponent();
    }
    public void tw()
    {
      for (int i = 0; i < 10000; i++)
      {
        textBox1.Text = i.ToString();
      }
    }
    private void button1_Click(object sender, EventArgs e)
    {
      t = new Thread(tw);
      t.Start();
    }
  }
}

Posted 4-Feb-16 18:00pm

Member 12235586

Updated 4-Feb-16 21:33pm

Andreas Gieriet

v4

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Comments

dan!sh 5-Feb-16 0:09am

What is the exception you are getting when you run with debug?

Member 12235586 5-Feb-16 0:23am

Cross-thread operation not valid: Control 'textBox1' accessed from a thread other than the thread it was created on.

dan!sh 5-Feb-16 0:28am

Are you accessing control from another thread?

Member 12235586 5-Feb-16 0:42am

no. this is my full code. please check it

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.Threading;

namespace thread_test_2
{
public partial class Form1 : Form
{
Thread t;
public Form1()
{
InitializeComponent();
}
public void tw()
{
for (int i = 0; i < 10000; i++)
{
textBox1.Text = i.ToString();
}
}
private void button1_Click(object sender, EventArgs e)
{
t = new Thread(tw);
t.Start();
}
}
}

[no name] 5-Feb-16 0:19am

And also share thread relevant code.

2 solutions

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*dan!sh* · Answer 1 · 2016-02-04T18:53:00

You are accessing the textbox in the thread you have created. You are doing this in your tw method. This is not allowed.

You are only getting this error while debugging because illegal cross thread calls are only checked if debugger is attached. Here is the relevant part of code from MSDN[^] (Line 300).

C#

// Initially check for illegal multithreading based on whether the
// debugger is attached.
[ResourceExposure(ResourceScope.Process)]
private static bool checkForIllegalCrossThreadCalls = Debugger.IsAttached;

You should take a look at BackgroundWorker. It may help you achieve what you are trying to do here.

Al_Brown · Answer 2 · 2016-02-04T20:38:00

Solution 2

As an alternative to using a background worker you can use BeginInvoke to ensure the text is changed on the main user interface thread.

This CodeProject article gives a very good overview and has a code example doing almost exactly what you need to fix your sample code.

Posted 4-Feb-16 20:38pm

Al_Brown