update Window Form's list box.

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alan - 14 Oct 2004 06:55 GMT

I have 2 classes
form.cs and cls1.cs

in form.cs
using cls1_ns;
namespace form_ns
{
....public class formCls.....
public System.Windows.Forms.ListBox LstBox;
...}

in cls1.cs

using form_ns;
namespace cls1_ns
{
class ...etc...
static formCls cForm = new formCls();
.....
public void funcA()
{
....
cForm.LstBox.Add (....)
}
}
}

this doesn't work, would you please tell how to update the value in window
form from another class?
thanks a lot!!!

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Claes Bergefall - 14 Oct 2004 07:48 GMT

The code that you show should work just fine.
You'll need to provide more info/code

/claes

> I have 2 classes
> form.cs and cls1.cs
[quoted text clipped - 26 lines]
> form from another class?
> thanks a lot!!!

Reply to this Message

alan - 14 Oct 2004 08:11 GMT

Label won't be updated, thanks!
here is my example :

Form1.cs

using Cls_ns;

namespace sampleFrm
{
public class Form1 : System.Windows.Forms.Form
{
    public System.Windows.Forms.Label label1;
    private System.Windows.Forms.Button button1;
    static Class1 cls = new Class1 ();
...etc....
    static void Main()
    {
        Application.Run(new Form1());
    }
    private void button1_Click(object sender, System.EventArgs e)
    {
        cls.update ();
    }
}
}

Class1.cs

------------------------------------------------------------------------------
using System;
using sampleFrm;

namespace Cls_ns
{
    /// <summary>
    /// Summary description for Class1.
    /// </summary>
    public class Class1
    {
        static Form1 frm = new Form1 ();
        public Class1()
        {
            //
            // TODO: Add constructor logic here
            //

        }

        public void update()
        {
            frm.label1.Text = "yeah";
        }
    }
}

> The code that you show should work just fine.
> You'll need to provide more info/code
[quoted text clipped - 31 lines]
> > form from another class?
> > thanks a lot!!!

Reply to this Message

Claes Bergefall - 14 Oct 2004 08:41 GMT

Well, you failed to mention that you already had an existing form.
Pass a reference of your exisiting form to the constructor of Class1

public class Form1 : System.Windows.Forms.Form
{
private Class1 cls = new Class1(this);
}

public class Class1
{
private Form1 m_frm;
public Class1(Form1 frm)
{
m_frm = frm;
}
public void update()
{
m_frm.label1.Text = "yeah";
}
}

/claes

> Label won't be updated, thanks!
> here is my example :
[quoted text clipped - 86 lines]
> > > form from another class?
> > > thanks a lot!!!

Reply to this Message

alan - 14 Oct 2004 10:15 GMT

thanks!
but i get the following error

private Class1 cls= new Class1(this);

" Keyword this is not available in the current context"

> Well, you failed to mention that you already had an existing form.
> Pass a reference of your exisiting form to the constructor of Class1
[quoted text clipped - 111 lines]
> > > > form from another class?
> > > > thanks a lot!!!

Reply to this Message

alan - 14 Oct 2004 10:25 GMT

thanks a lot!
i have solved it

Reply to this Message

alan - 14 Oct 2004 08:17 GMT

is that when I instantiate -->
static formCls cForm = new formCls();

there will be a new "Form Class", so whatever I update, i just update on the
copy, but not the real form?
how can i solve the problem?

thanks!!!

> The code that you show should work just fine.
> You'll need to provide more info/code
[quoted text clipped - 31 lines]
> > form from another class?
> > thanks a lot!!!

Reply to this Message

update Window Form's list box.

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