Today I tried to make a form take up the whole screen (including the taskbar) in C# on the .NET platform. .NET WinForms does not offer functionality to do this, so I nosed around the web. All results that I found used platform-dependent P/Invoke calls to accomplish this goal. However, I wanted to keep my code platform-independent, so I created a pure, managed .NET solution.
First, we need some member variables to remember the window state, so we can come back out of full screen mode:
private FormWindowState m_previousWindowState; private Bounds m_previousBounds; private FormBorderStyle = m_previousBorderStyle;
The code to switch into full screen mode then becomes:
m_previousBorderStyle = FormBorderStyle; m_previousWindowState = WindowState; m_previousBounds = Bounds; // Stay on top of everything else. TopMost = true; // Remove the window border. FormBorderStyle = FormBorderStyle.None; // We cannot change the Bounds of a maximized form. WindowState = FormWindowState.Normal; // Set the size of the form to the size of its screen. Bounds = Screen.FromControl(this).Bounds;
The code to switch back simply restores all this:
TopMost = false; FormBorderStyle = m_previousBorderStyle; WindowState = m_previousWindowState; Bounds = m_previousBounds;
It's really quite simple, and I don't know why people make it more complex than it should be.