form not visible

Question

i have a windows application.
the form is not visible but the app reports that it is.
i have a timer event

private void TmrDebug_Tick(object sender, EventArgs e)  
{  
System.Diagnostics.Debug.Print("Size(" + Width.ToString() + ", " + Height.ToString() + ")"  
                                + "Loc(" + Left.ToString() + ", " + Top.ToString() + ")"  
                                + "Visible:" + Visible.ToString()   
                                + " State:" + WindowState.ToString());  
}  
  

that reports every 500 ms and this is my screen shot

you can see the timer event reporting in the output window telling me that the form is visible
but it is NOT.

why is this happening?

Answer 1

Hello,

The following has a Timer and a button in a standard windows form project. Click the button to toggle visible and in this example Visible is reported correctly.

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            Shown += OnShown;
        }

        private bool _loaded;
        private void OnShown(object sender, EventArgs e)
        {
            _loaded = true;
        }

        private void Form1_VisibleChanged(object sender, EventArgs e)
        {
            if (_loaded)
            {
                Debug.WriteLine($"{Visible}");
            }

        }

        private async void button1_Click(object sender, EventArgs e)
        {
            Visible = !Visible;
            await Task.Delay(2000);
            Visible = !Visible;
        }


    }
}

Answer 2

ok.
I eventually pulled the wool out from in front of my eyes and noticed that the form's vertical location was WAY off below the screen.
what was happening was that I had a SaveFormat.txt file that sequentially resized and positioned the form but the form's SizeChanged() & LocationChanged() event handlers were playing funny with it until I added a boolean telling them to bolIgnoreChanges while the load formatting was happening.
I am way too paranoid, next I'll think the North Koreans hacked my 4th grade class-president election.

thank you for your attention