C#: how to count how many windows are visible (not minimized)?

List all desktop windows code example: [^]

/// <summary>
/// EnumDesktopWindows Demo - shows the caption of all desktop windows.
/// Authors: Svetlin Nakov, Martin Kulov
/// Bulgarian Association of Software Developers - http://www.devbg.org/en/
/// </summary>

Perhaps off-topic, but, fyi: in a WinForm Application: you can use Application.OpenForms to get a list of all open Forms, including minimized Forms.

Code example:

private void button1_Click(object sender, EventArgs e)
{  
    int notMinimizedFormCnt = 0;

    foreach (Form frm in Application.OpenForms)
    {
        // exclude the Form in which this code is called ?
        if (frm == this) continue;

        if (frm.WindowState != FormWindowState.Minimized) notMinimizedFormCnt++;
    }

    label1.Text = notMinimizedFormCnt.ToString();
}

Note that if you have called Hide() on a Form, it still shows up in the Application.OpenForms collection: it's WindowState property is not changed ! imho, WinForms should provide another value in the WindowState enum for a hidden Form.