How can I check if the window is closed or not ( WPF application ) from another form?

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Hello , I'm already working on an WPF application and I would like to know how can I check if the window is closed or not with ( X ) from another Window form.

For example , I have two form
the first form contains just a button so when I click on the button , it will show the second form and I should see in the output ( using `Console.writeline(form2.isclosed())` a message that show False, when I close the second form , the output should show a message True ( mean that the form2 was closed ) .

The two `Console.writeline()` should be in the first form not in the second ,
How can I do this?

C#

// Window form 1
           
            for (int k = 0; k <= listgrid.Count - 1; k++)
            {
                test  test = new test(listgrid[0]); // the new form ( Window form 2 )
                test.Show();
                if (test.IsClosed) // I need to check here if the window form 2 is closed or not
                {
                    Console.WriteLine("OKK Is closed after  " + test.IsClosed);
                    test.Show();
                }

            }

C#

// Second form
  public partial class test : Window
    {
        public bool test_close;

        public test(GridModel gridModel)
        {
            InitializeComponent();           
 
        }

        private void Window_Closed(object sender, EventArgs e)
        {
        //      base.Close();
            IsClosed = true;
            Console.WriteLine( " Ok " +IsClosed);
        }
        public bool IsClosed { get; private set; }

        protected override void OnClosed(EventArgs e)
        {
            base.OnClosed(e);
            IsClosed = true;
        }

What I have tried:

I have tried to just show the second form from a button in the first form.

Posted 3-Sep-20 4:41am

abdou_31

Updated 3-Sep-20 4:53am

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OriginalGriff · Answer 1 · 2020-09-03T04:51:00

Solution 1

The simplest solution is to handle the second forms Closed event in the first: when you create the Form2 instance, you add your event handler beofe ryou show the the form, and your handler will be executed when Form2 closes.

It's pretty simple to do: Transferring information between two forms, Part 2: Child to Parent[^] shows the basics using a custom event - but the Closed event is part of a Form anyway, in both WPF and WinForms.

Posted 3-Sep-20 4:51am

OriginalGriff

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abdou_31 3-Sep-20 11:06am

Thanks , but I can only pass parameters from form 1 to second form , not the contrariwise because I don't have ( `new form1().show()` in the second form ) I need just to get the result of event ( true or false ) from the second form and print it in the form 1 , I say `Console.writeline()` ( print ) just to get it for test, I need them later in other work.

OriginalGriff 3-Sep-20 11:59am

You don't need to.
The event is handled by the non-closed form (Form1, which displays From2 to start with) automatically when Form2 closes. The Form2 instance that closed is passed to the event handler via the "sender" parameter, allowing your Form1 code to access it's properties at will.

Afzaal Ahmad Zeeshan · Answer 2 · 2020-09-03T04:54:00

1. Why are you using the Console.WriteLine in a GUI based app?
2. I think it would be better to use events in C# and delegate the notification to the parent Form instead of hardcoding/eyeballing the form to be closed before your proceed in C# code.

Handling and Raising Events | Microsoft Docs[^]\

This way you can trigger the event in the parent Form that the form is closing and the parent Form will "know" the form has closed, so you can proceed from there. Please check the documentation to learn more about that.

A little dirty approach will be to pass the parent Form instance in the test Form constructor and just before closing, call the method in parent Form to notify that the form has closed.

C#

WindowForm1 form1;
public test(GridModel gridModel, WindowForm1 parent)
{
    InitializeComponent();

    this.form1 = parent;
}

// later
private void Window_Closed(object sender, EventArgs e)
{
    // base.Close();
    IsClosed = true;
    Console.WriteLine( " Ok " +IsClosed);
    form1.FormClosed(this);
}

For this to work, accept the method in WindowForm1 to proceed;

C#

public void FormClosed(test form) {
   // your logic here
}

I repeat, this is a dirty approach; what's worse is that if you call the method this way, your secondary form has not yet closed (the method call has not returned) so you will be incorrect in your logic; I am sorry. :sigh:

How can I check if the window is closed or not ( WPF application ) from another form?

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How can I check if the window is closed or not ( WPF application ) from another form?

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