How to programmatically display the Windows taskbar using C#

Question

I would like to know what C# code/instructions are necessary to make the Windows taskbar appear so that I can use a specific item on it. Can someone provide a concise example or resource to help me accomplish this? Thank you.

Answer 1

On Windows 10, this test shows the Taskbar when it is hidden (AutoHide)

            IntPtr hWndTray = FindWindow("Shell_TrayWnd", null);
            SetWindowPos(hWndTray, IntPtr.Zero, 0, 0, 0, 0, SWP_NOZORDER | SWP_NOMOVE | SWP_NOSIZE | SWP_FRAMECHANGED | SWP_SHOWWINDOW);

  with :

        [DllImport("User32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
        public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

        [DllImport("User32.dll", SetLastError = true, CharSet = CharSet.Auto)]
        public static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X, int Y, int cx, int cy, uint uFlags);

        public const int SWP_NOSIZE = 0x0001;
        public const int SWP_NOMOVE = 0x0002;
        public const int SWP_NOZORDER = 0x0004;
        public const int SWP_NOREDRAW = 0x0008;
        public const int SWP_NOACTIVATE = 0x0010;
        public const int SWP_FRAMECHANGED = 0x0020;  /* The frame changed: send WM_NCCALCSIZE */
        public const int SWP_SHOWWINDOW = 0x0040;
        public const int SWP_HIDEWINDOW = 0x0080;
        public const int SWP_NOCOPYBITS = 0x0100;
        public const int SWP_NOOWNERZORDER = 0x0200;  /* Don't do owner Z ordering */
        public const int SWP_NOSENDCHANGING = 0x0400;  /* Don't send WM_WINDOWPOSCHANGING */
        public const int SWP_DRAWFRAME = SWP_FRAMECHANGED;
        public const int SWP_NOREPOSITION = SWP_NOOWNERZORDER;
        public const int SWP_DEFERERASE = 0x2000;
        public const int SWP_ASYNCWINDOWPOS = 0x4000;