CODEWITHSUNDEEP
c#.netwinforms.net-3.5non-modal
crazy novice
crazy novice

Reputation: 1817

how to check if a non-modal dialog is already launched

My application launches a non-modal dialog on a button click. If user clicks on that button again, I would like to do a check if that form is already running and wonder if its possible?

Upvotes: 1

Views: 1056

Answers (2)

Idle_Mind
Idle_Mind

Reputation: 39122

Another approach is to manually declare a variable to track your form instance:

public partial class Form1 : Form
{

    public Form1()
    {
        InitializeComponent();
    }

    private Form2 f2 = null;

    private void button1_Click(object sender, EventArgs e)
    {
        if (f2 == null || f2.IsDisposed)
        {
            f2 = new Form2();
            f2.Show();
        }
        else
        {
            f2.Close();
        }
    }

}

Upvotes: 0

Sergey Berezovskiy
Sergey Berezovskiy

Reputation: 236208

You can use Application.OpenForms Property

if (Application.OpenForms.OfType<YourNonModalFormType>().Any())
   // one is already opened

If you want to close this form:

var form = Application.OpenForms.OfType<YourNonModalFormType>().FirstOrDefault();
if (form != null)
{
    // launched
    form.Close();
}

Upvotes: 4

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