How to hide and re-view taskbar in C#?

Question

I want my application to have a button that hides and re-exports the Windows taskbar in C#, to block user access to it. Any suggestions?

Answer 1

Hiding the task is a very complicated thing, mainly because it’s not something that applications can just go around doing. Otherwise it would be easy to make it a mess.

What you want, is to keep the screen of your application in full screen and that’s very simple. It is only necessary to maximize the form, remove borders and set property TopMost as true.

Example:

// colocar o form em full screen
private void btFullScreen_Click(object sender, EventArgs e)
{
    TopMost = true;
    FormBorderStyle = FormBorderStyle.None;
    WindowState = FormWindowState.Maximized;
}

// Voltar ao estado normal (barra tarefas aparecendo)
private void btRestaurar_Click(object sender, EventArgs e)
{
    TopMost = false;
    FormBorderStyle = FormBorderStyle.FixedSingle; // ou a que estava antes
}

Answer 2

As they said, it’s very complicated to do, but not impossible. Add a new class with the following code:

using System; using System.Runtime.Interopservices;

public class Taskbar
{
    [DllImport("user32.dll")]
    private static extern int FindWindow(string className, string windowText);

    [DllImport("user32.dll")]
    private static extern int ShowWindow(int hwnd, int command);

    [DllImport("user32.dll")]
    public static extern int FindWindowEx(int parentHandle, int childAfter, string className, int windowTitle);

    [DllImport("user32.dll")]
    private static extern int GetDesktopWindow();

    private const int SW_HIDE = 0;
    private const int SW_SHOW = 1;

    protected static int Handle
    {
        get
        {
            return FindWindow("Shell_TrayWnd", "");
        }
    }

    protected static int HandleOfStartButton
    {
        get
        {
            int handleOfDesktop = GetDesktopWindow();
            int handleOfStartButton = FindWindowEx(handleOfDesktop, 0, "button", 0);
            return handleOfStartButton;
        }
    }

    private Taskbar()
    {
        // hide ctor
    }

    public static void Show()
    {
        ShowWindow(Handle, SW_SHOW);
        ShowWindow(HandleOfStartButton, SW_SHOW);
    }

    public static void Hide()
    {
        ShowWindow(Handle, SW_HIDE);
        ShowWindow(HandleOfStartButton, SW_HIDE);
    }
}

Show() shows and hide() hidden.