Close SaveFileDialog/OpenFileDialog programmatically without using pinvoke

Question

Due to some requirements, I have to close SaveFileDialog programmatically without using PINVOKE.

Is there any way to close SaveFileDialog other than using the PINVOKE way? I had tried to close the owner form of the SaveFileDialog, but the SaveFileDialog still there.

What I had tried:

1. Close the form which execute the ShowDialog() of SaveFileDialog.
2. SaveFileDialog.Dispose()

Answer 1

Closing the owner window passed to the ShowDialog(owner); method should work. For example:

private static Form CreateDummyForm(Form owner) {
    Form dummy = new Form();
    IntPtr hwnd = dummy.Handle; // force handle creation
    if (owner != null) {
        dummy.Owner = owner;
        dummy.Location = owner.Location;
        owner.LocationChanged += delegate {
            dummy.Location = owner.Location;
        };
    }
    return dummy;
}

[STAThread]
static void Main() {

    Form form = new Form();
    form.Size = new Size(400,400);
    Button btn = new Button { Text = "btn" };
    btn.Click += delegate {
        SaveFileDialog fsd = new SaveFileDialog();
        int timeoutMillis = 5000;
        Form dummy = CreateDummyForm(form); // Close disposes the dummy form
        Task.Delay(TimeSpan.FromMilliseconds(timeoutMillis)).ContinueWith((t) => { dummy.Close(); dummy.Dispose(); }, TaskScheduler.FromCurrentSynchronizationContext());
        fsd.ShowDialog(dummy);
        fsd.Dispose();
    };

    form.Controls.Add(btn);
    Application.Run(form);
}