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fetch value of text box outside thread

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Join Date: May 2008

Posts: 2

Reputation: nasirgul is an unknown quantity at this point

Solved Threads: 0

nasirgul

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Newbie Poster

fetch value of text box outside thread

May 22nd, 2008

Hello,
I am new to C#. I want to know one thing. How can I get value from text box(or update text box value from another thread) while working on C# Threading. I tried but cant able to get. Below is the code. I want to use text box values in public void Run() function as for unlimited value and then further use in private void AddString(String s) for showing as GUI.

 Help with Code Tags 
 C# Syntax (Toggle Plain Text) 
private void AddString(String s)
		{
            n = hi.Text; 
 
            int val = Convert.ToInt32(m);
            int val2 = Convert.ToInt32(s);
            int val3 = Convert.ToInt32(n);
            int sum = 0;
            sum = sum + val3 + val2;
            listBox1.Items.Add(sum);
 
		}
 
        public void Run()
        {   String s;
        int a = 2;
        s=a.ToString();
              while (true)
            {
                Thread.Sleep(400);
                m_form.Invoke(m_form.m_DelegateAddString, new Object[] { s });
                    // check if thread is cancelled
                if (m_EventStop.WaitOne(0, true))
                {   // clean-up operations may be placed here
                       // inform main thread that this thread stopped
                   m_EventStopped.Set();
                    return;
                }
            }
        }
private void AddString(String s)
		{
            n = hi.Text; 
             
            int val = Convert.ToInt32(m);
            int val2 = Convert.ToInt32(s);
            int val3 = Convert.ToInt32(n);
            int sum = 0;
            sum = sum + val3 + val2;
            listBox1.Items.Add(sum);
           
		}
        
        public void Run()
        {   String s;
        int a = 2;
        s=a.ToString();
              while (true)
            {
                Thread.Sleep(400);
                m_form.Invoke(m_form.m_DelegateAddString, new Object[] { s });
                    // check if thread is cancelled
                if (m_EventStop.WaitOne(0, true))
                {   // clean-up operations may be placed here
                       // inform main thread that this thread stopped
                   m_EventStopped.Set();
                    return;
                }
            }
        }

Hope to hear soon.
Regards.
Nasir

•

Join Date: Aug 2006

Posts: 2,065

Reputation: Ramy Mahrous is just really nice

Solved Threads: 256

Ramy Mahrous Ramy Mahrous is offline

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Postaholic

Re: fetch value of text box outside thread

May 22nd, 2008

 Help with Code Tags 
 c# Syntax (Toggle Plain Text) 
if (textbox1.InvokeRequired)
            {
                //txtFilePath.Invoke(ur delegate );
            }
            else
            {
                //call ur method
            }
if (textbox1.InvokeRequired)
            {
                //txtFilePath.Invoke(ur delegate );
            }
            else
            {
                //call ur method
            }

Last edited by Ramy Mahrous; May 22nd, 2008 at 1:11 pm.

BI Developer | LINKdotNET
B.Sc Computer Science, Helwan University
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LinkedIn | http://www.linkedin.com/in/ramymahrous

•

Join Date: May 2008

Posts: 2

Reputation: nasirgul is an unknown quantity at this point

Solved Threads: 0

nasirgul

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Newbie Poster

Re: fetch value of text box outside thread

May 22nd, 2008

Hello,
Thanks for yours reply. I tried bt I am getting error at if (this.textBox1.InvokeRequired); while debugging....and break on this point.
////define public

public delegate void SetText(string text);

//////

private void AddString(String s)
{
// n = hi.Text;
int val = Convert.ToInt32(m);
int val2 = Convert.ToInt32(s);
int val3 = Convert.ToInt32(n);
int sum;
sum = val2;
listBox1.Items.Add(sum);

}

public void Run()
{
string s;// double v = 2;
int a = 2;
//hi.Text = v.ToString();

s = a.ToString();
while (true)
{
Thread.Sleep(400);
m_form.Invoke(m_form.m_DelegateAddString, new Object[] { s });
this.SetTextBoxValue("BOB");
string textBoxValue = this.hi.Text;

// check if thread is cancelled
if (m_EventStop.WaitOne(0, true))
{ // clean-up operations may be placed here
// inform main thread that this thread stopped
m_EventStopped.Set();
return;
}
}
}
public void SetTextBoxValue(string textValue)
{

if (this.hi.InvokeRequired)
{

SetText del = new SetText(this.SetTextBoxValue);

this.hi.Invoke(del, new object[] { textValue });

}

else
{

this.hi.Text = textValue;

}

}

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Join Date: Aug 2006

Posts: 2,065

Reputation: Ramy Mahrous is just really nice

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Ramy Mahrous Ramy Mahrous is offline

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Postaholic

Re: fetch value of text box outside thread

May 23rd, 2008

Look I can't look at your code but I'll give you an example

 Help with Code Tags 
 C# Syntax (Toggle Plain Text) 
delegate void Hello();
 
        void SetHello()
        {
            txtBox.Text = "Hello";
        }
 
        void Perform()
        {
            Hello setHelloDelegateInstance = new Hello(SetHello);
            if (txtBox.InvokeRequired)
            {
                txtBox.Invoke(setHelloDelegateInstance, new object[] { });
            }
            SetHello();
        }
 
        private void btn_Click(object sender, EventArgs e)
        {
            Thread t = new Thread(new ThreadStart(Perform));
            t.Start();
        }
delegate void Hello();

        void SetHello()
        {
            txtBox.Text = "Hello";
        }

        void Perform()
        {
            Hello setHelloDelegateInstance = new Hello(SetHello);
            if (txtBox.InvokeRequired)
            {
                txtBox.Invoke(setHelloDelegateInstance, new object[] { });
            }
            SetHello();
        }

        private void btn_Click(object sender, EventArgs e)
        {
            Thread t = new Thread(new ThreadStart(Perform));
            t.Start();
        }

You can also code your fetch textbox's text in the same mannar.