partial class implementation using c#

Question

3.00/5 (3 votes)

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I have a form with a tab control with multiple tabs, and I would like to put the code of each tab in a diferent file (partial classes of the form class); I tried to do that but I can not access the objects of the mais class /form from the other files. Any one knows why ? thanks

Here is a sample of the code (Form):

C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace SimplyApp
{
  public partial class frmPlanning : Form
  {
    public frmPlanning()
    {
      InitializeComponent();
      //lstvOutputs_Circuits.ColumnWidthChanging += new ColumnWidthChangingEventHandler(lstvOutputs_Circuits_ColumnWidthChanging);
    }
    SQLutils mySQL = new SQLutils();
    static byte Actuator_NumOutputs = 0;
    int prjActuatorId = 0;
    string CircuitStatus = "";
    string ActuatorStatus = "";
    public void frmPlanning_Load(object sender, EventArgs e)
    {
      Init();
    }
 
    private void Init()
    {
      mySQL.SetConn();  
      tabOptions.Visible = false;

      cboProjectCodes.Items.Clear();
      tabOptions.SelectTab(0);
      FillModuleTypes();
      FillPanelColors();
      FillImageList();
      dgvPrjCircuits.BackgroundColor = this.BackColor;
      dgvPrjActuators.BackgroundColor = this.BackColor;
      tabAct_dgvActuatorSelection.BackgroundColor = this.BackColor;
      dgvPrjRelActuatorOutputs_Circuits.BackgroundColor = this.BackColor;
      dgvPrjPanelPrgs.BackgroundColor = this.BackColor;
      dgvPrjActuatorsPrgs.BackgroundColor = this.BackColor;
      AssignImgsToTs();
      cont_Planeamento.SplitterDistance = 425;
    }

    private void tsPrj_Select_Click(object sender, EventArgs e)
    {
      if (cboDivisions.Text != "")
      {
        cboProjectCodes.Enabled = false;
        cboPlans.Enabled = false;
        cboDivisions.Enabled = false;
        tabOptions.Visible = true;
        RefreshDgvPrjCircuits();
        dgvPrjCircuits.ClearSelection();
        RefreshDgvPrjActuators();
        dgvPrjActuators.ClearSelection();
        TagUsedCircuits();
      }
    }

other file code ......

C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace SimplyApp
{
  public partial class frmPlanning
  {
   //I do not have any access to any control in the form ... why ?
  }
}

Thanks

Posted 8-Mar-11 5:52am

generalcosta

Updated 8-Mar-11 6:39am

Albin Abel

v3

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Albin Abel 8-Mar-11 12:49pm

Check any bugs in your main form

3 solutions

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JOAT-MON · Accepted Answer · 2011-03-08T07:25:00

Solution 3

Those controls were declared already in the other partial class pages. You cannot access them in a declaritive context, but you can in a functional one.

C#

public partial class frmPlanning
  {
   //I do not have any access to any control in the form ... why ?
   // cannot do anything with cboProjectCodes here, must put in a funtion
   public void Test()
   {
       cboProjectCodes.Items.Clear();
   }
  }

Remember that all pages of the partial class are just continuations of each other, so you cannot just use variables/contraols that have been declared, but rather must put them in functions. You can also declare new variables that do not exist on other pages. Same with methods, you can call them from inside another method or overload the existing.

Posted 8-Mar-11 7:25am

JOAT-MON

Comments

generalcosta 8-Mar-11 15:10pm

thanks it works fine ..

Sergey Alexandrovich Kryukov 8-Mar-11 15:16pm

Of course.
--SA

JOAT-MON 8-Mar-11 15:22pm

I'm glad it helped. Thank you for accepting as answer. :)

Sergey Alexandrovich Kryukov 8-Mar-11 15:21pm

You got my 5, but this is because I beat OP until some code sample was finally posted... :-)
Everyone before you advised blindfolded...
Cheers,
--SA

JOAT-MON 8-Mar-11 15:27pm

Lol, thanks! I hope your hand is okay... :P

Sergey Alexandrovich Kryukov 8-Mar-11 16:12pm

Fine, thanks. I used my feet booted in my hiking boots :-)
--SA

fjdiewornncalwe 8-Mar-11 16:14pm

We have a winner. +5

_Dhull 12-Mar-13 7:33am

awesome job... but could you please tell me " how to call this method on Button Click of Second from" Please

_Dhull 12-Mar-13 8:23am

My Code is May it will help you to understand my proble:

i have tabcontrol on one page(normal page not MDI)
on second page i have close button..i need to close the tabpage on click ( i am showing page in tab...and on close tabpages must be close along with Form)

First page :
namespace Pack
{

public partial class Main_View : Form
{
public void test()
{
tabControl1.SelectedTab.Dispose();
}
}
}
--------------------------------
on second page :

private void btnExitbutton_Click(object sender, EventArgs e)
{
// need to call funcion here :: i write here .... Pack.Main_View a= new Pack.Main_View ();
a.test();
}
------------------------------------
as per your prior advise i make a method her like :

namespace Pack
{

public partial class Main_View : Form
{
public void test()
{
tabControl1.SelectedTab.Dispose();
}
}
}

but i doest not counting tagpages ....!!!!

JOAT-MON 12-Mar-13 14:02pm

I'm sorry, I don't understand the problem that you are trying to describe. Could you please clarify? (i.e. Are you trying to communicate between two forms, two tabpages, or two files of the same class? Is the purpose of the button to dispose of the form, a single tabpage, or all the tabpages?)

_Dhull 13-Mar-13 2:20am

Thanks for your reply

i have one some control on Master page
1> tree view
2> tabcontrol

on tree view node click i am opening a new page in Tabcontrol <offcource in="" tabforms="">

my problem is : i have close button on every page . how can i close tabform < container of that page > along with page.

JOAT-MON 13-Mar-13 3:06am

Ok, I believe what you are looking for is:

// if your Button.Click event is handled inside the scope of the Main_View partial class,
// then you should be able to reference the tabControl1 object from inside
// the Button.Click event handler
private void btnExitbutton_Click ( object sender, EventArgs e)
{
tabControl1.SelectedTab.Dispose();
}

// if your Button.Click is handled inside the scope of the TabPage class,
// then you will want to use the 'this' keyword to reference the page you are on
private void btnExitbutton ( object sender, EventArgs e )
{
this.Dispose();
}

Let me know if I am misunderstanding you.

_Dhull 13-Mar-13 6:22am

Thanks Joat

i solve it..Many Thanks :)
Hope same responce in furute also ... Good Luck :)

Abhinav S · Accepted Answer · 2011-03-08T06:39:00

Solution 2

You should be able to access all methods within your partial class.

You will not be able to access main form methods in other files as your methods appear to be all private.

Posted 8-Mar-11 6:39am

Abhinav S

Comments

Albin Abel 8-Mar-11 12:48pm

I guess, partial classes have access to private methods whichever the file is.

Sergey Alexandrovich Kryukov 8-Mar-11 12:54pm

...whichever the class has. It's not related to the file except different "uses" clauses.
--SA

Sergey Alexandrovich Kryukov 8-Mar-11 12:55pm

Yes, Abhinav, if you're discussing the OP subject, partial class declaration, you last sentence is incorrect. I would advice to fix it or re-formulate to make it clear.
--SA

generalcosta 8-Mar-11 12:57pm

thanks
Anyway even if I put them public I´m not able to access them neither the form controls from the new file

Sergey Alexandrovich Kryukov 8-Mar-11 14:06pm

As I say, this is not about "public" (by the way, don't use "public" when "internal" works). Show some code sample, really... (Please, don't post as Answer, use "Improve quesion").
--SA

Abhinav S 8-Mar-11 23:48pm

Good point here SA.

Sergey Alexandrovich Kryukov · Accepted Answer · 2011-03-08T06:06:00

Solution 1

I don't know because you don't show the code, but partial class implementation cannot cause any problem in principle. The partial class declarations behave precisely as if they were in one file.

Rather, you need to check up "using" clauses where you have a problem and add what's missing.

—SA

Posted 8-Mar-11 6:06am

Sergey Alexandrovich Kryukov

Comments

rigamonk 8-Mar-11 13:37pm

Do you mean your Intellisense won't work, or it won't compile? If it won't compile, whats the error?
Are these class file under the same assembly?
I know these may seem like elementary questions, but, as SAKryukov noted, partial class implementation is very straightforward.
Every form you create using the forms template is implemented as a partial class (e.g. Form1.cs and Form1.Designer.cs

Sergey Alexandrovich Kryukov 8-Mar-11 14:04pm

You probably misplaced your comment, it's not for me :-)
--SA

Abhinav S 8-Mar-11 23:48pm

Good answer.5.

Sergey Alexandrovich Kryukov 9-Mar-11 0:26am

Thank you,
It was before we got some code...
--SA