在C#中確認視窗是否是全螢幕

要確認一個視窗是否是全螢幕
可以直接比對視窗的大小是否與螢幕大小相同
因為如果不是全螢幕的視窗，那至少會有一部分被工具列佔走

public struct RECT
{
public int left;
public int top;
public int right;
public int bottom;
}

[DllImport("user32.dll")]
private static extern int GetWindowRect(
IntPtr hWnd, out RECT lpRect);

bool IsFullScreen(IntPtr h)
{
/// get window bound from handle
RECT b;
GetWindowRect(h, out b);

/// get screen bound from handle
Rectangle r = Screen.FromHandle(h).Bounds;

/// check if the two size is the same
if ((b.bottom - b.top) == r.Height &&
(b.right - b.left) == r.Width)
{
return true;
}

return false;
}

注意Screen這個類別是宣告在System.Windows.Forms裡面
還有Rectangle是宣告在System.Drawing裡面
所以如果是WPF的程式，則需要另外新增參考

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參考資料
GetWindowRect Function
RECT Structure
Screen.FromHandle 方法
Detect whether active window is full screen