how to access main Form component from another class

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5.00/5 (1 vote)

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C#

hi..
i want to know how to access main Form component from another class(not form...just a class)...thank you

Posted 24-Apr-11 3:55am

guendouz bachir

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3 solutions

Solution 4

Another way which I think is the most robust is using interfaces.

Please see my Solution and other solutions here:
How to copy all the items between listboxes in two forms[^].

—SA

Posted 24-Apr-11 7:08am

Sergey Alexandrovich Kryukov

Comments

Nish Nishant 24-Apr-11 13:10pm

Good suggestion, voted 5.

Sergey Alexandrovich Kryukov 24-Apr-11 13:15pm

Thank you, Nishant.
--SA

Solution 3

This is the from class

<pre lang="cs">namespace WindowsFormsApplication
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
    }
}

This is the other class named Class1...

<pre lang="midl">namespace WindowsFormsApplication
{
    class Class1
    {
    }
}

this is the exemple, i want access to oblect(listbox) in form, from class1 ...how?

Posted 24-Apr-11 6:17am

guendouz bachir

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Nish Nishant · Accepted Answer · 2011-04-24T04:27:00

Solution 1

Typically, this would be Application.OpenForms[0] (You will need to cast it to the derived form type). Alternatively you could store a reference to the main form in a static variable.

[Update]
-----------

In response to your comment, see this example code:

C#

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }
}

public class Class1
{
  public Class1()
  {
    Form1 mainForm = (Form1)Application.OpenForms[0];
  }
}

Posted 24-Apr-11 4:27am

Nish Nishant

Updated 24-Apr-11 6:39am

v2

Comments

Kim Togo 24-Apr-11 10:28am

My 5. Application.OpenForms is a collection of open forms owned by the application.

guendouz bachir 24-Apr-11 10:33am

Mr Nishant Sivakumar give me an example (demo) or an article explain that

Nish Nishant 24-Apr-11 10:35am

It's just one line. MainForm mainForm = (MainForm)Application.OpenForms[0];

guendouz bachir 24-Apr-11 10:45am

I'll even with

Nish Nishant 24-Apr-11 10:46am

>> I'll even with
<<
. . . . . .
What does that mean?

guendouz bachir 24-Apr-11 12:19pm

I tried what you told me, but it don't work ...see the comment in down

Nish Nishant 24-Apr-11 12:26pm

I don't see any code where you've done what I suggested above.

guendouz bachir 24-Apr-11 12:34pm

Explained to me more, i can't understand your suggested above(it don't work)...

Nish Nishant 24-Apr-11 12:39pm

I have updated my answer now.

guendouz bachir 24-Apr-11 12:37pm

see the solution 3 i had put an explain ...i hope that u can understand it

Nish Nishant 24-Apr-11 12:39pm

Check the example in my updated answer.