CODEWITHSUNDEEP
c#winforms
Paulo Barretto
Paulo Barretto

Reputation: 175

Open second form from third form

I have 3 forms. The second is for displaying help, the third is a modal dialog.

In Form1 I have:

Form2 HelpForm = new Form2();
Form3 EditForm = new Form3();

and a Help menu that just does:

HelpForm.Show();

I would like to show HelpForm also from a control in Form3. How can I do that?

Upvotes: 0

Views: 619

Answers (3)

Chitta
Chitta

Reputation: 21

Pass HelpForm object in the constructor of EditForm and assign the same in private variable. Invoke show when needed using the variable.

Form2 HelpForm = new Form2();
Form3 EditForm = new Form3(HelpForm);
 .....
EditForm.ShowHelp();

With in Form3:

 Class Form3
 {
    private Form2 helpForm = null;

     public Form3(Form2 HelpForm)
      {
          helpForm = HelpForm;
       }

       public void ShowHelp()
      {
          helpForm.Show();
       }
    }

Upvotes: 0

vmg
vmg

Reputation: 10576

As an option you can use Application.OpenForms

FormCollection fc = Application.OpenForms;

if (fc.OfType<Form3>().Any())
{
   fc.OfType<Form3>().First().Show();
}

Upvotes: 0

relascope
relascope

Reputation: 4646

the help is kind of global and (if your application grows) it should be accessible anywhere. So maybe a (kind of) Singleton for your Help could help!

class Help
{
   private static Form helpForm = null;
   static void ShowHelp {
     if (helpForm == null)
        helpForm = generateHelpForm(); //TODO implement

     helpForm.Show();
 }

access it from anywhere...

// somewhere in formx
Help.ShowHelp();

Upvotes: 1

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