CODEWITHSUNDEEP
c#winforms
Sergey
Sergey

Reputation: 8071

How to open in winforms window, but if this window was already opened just bring it up

I have window "Child 1", it opens from "Parent". Once I click in menu to open "Child 1" it can open several windows if I click several times in the menu. How to verify if the window "Child 1" opens then we should just bring it up.

The code which I use to open the window:

    var ticketTypesForm = new fTicketTypes();
    ticketTypesForm.Show();

Upvotes: 0

Views: 1453

Answers (5)

Bronek
Bronek

Reputation: 11235

  1. If it is ok for your app to use the child window in Modal mode (you don't need user interaction with parent window ) then just use the child one as Modal. The window is always on top.

    var ticketTypesForm = new fTicketTypes(); ticketTypesForm.ShowDialog(this);

  2. Also your app can close the child window by method Hide() when user closes the window. So the dialog will be never disposed. But in this case you must use the same instance of ticketTypesForm (not creating the new one every time the window is opened )

init app or first displaying

var ticketTypesForm = new fTicketTypes();

show

ticketTypesForm.Show(this);

close

ticketTypesForm.Hide();

Upvotes: 0

Amer Sawan
Amer Sawan

Reputation: 2292

Before show your new form again, check if its already opened or not using :

Application.OpenForms.OfType<YOUR_FORM_TYPE>().Any())

and if its opened, ignore he command, but if not open it again, you can do the following :

    ticketTypesForm myTicketTypesForm;
    private void OpenDialog(object sender, EventArgs e)
    {
        if (!Application.OpenForms.OfType<ticketTypesForm>().Any())
        {
            if (myTicketTypesForm == null)
                myTicketTypesForm = new ticketTypesForm();
            myTicketTypesForm.Show();
        }
        else
        {
            myTicketTypesForm.Focus();
        }
    }

Upvotes: 1

lem.mallari
lem.mallari

Reputation: 1275

Calling the Application.OpenForms will give you a collection of all your open forms. You can just navigate through each of the open forms to check if Child Form 1 has been created already. If it is just call the .Focus() method to bring it up front. If it has not been created yet, create the form as you would.

Upvotes: 3

Rao Ehsan
Rao Ehsan

Reputation: 778

Don't use var, instead you can do this

fTicketTypes ticketTypeForm;
//Some code goes here.
if(ticketTypeForm == null)
    ticketTypeForm = new fTicketTypes();
ticketTypeForm.Show();

Upvotes: 1

Luiz Freneda
Luiz Freneda

Reputation: 112

Just keep a reference from your class instead creating one everytime.

Upvotes: 1

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