WPF当窗体WindowStyle=”None”时，最大化会覆盖掉任务栏。如何解决这个问题呢？
我在Google里面搜到一篇文章，要用到Win32 API，通过让WPF窗体WM_GETMINMAXINFO消息挂接一个钩子来处理。
public static void RepairWindowBehavior(Window wpfWindow)
{ if (wpfWindow == null) return; wpfWindow.SourceInitialized += delegate { IntPtr handle = (new WindowInteropHelper(wpfWindow)).Handle; HwndSource source = HwndSource.FromHwnd(handle); if (source != null) { source.AddHook(WindowProc); } }; } private static IntPtr WindowProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled) { switch (msg) { case 0x0024: WmGetMinMaxInfo(hwnd, lParam); handled = true; break; } return (IntPtr)0; } private static void WmGetMinMaxInfo(IntPtr hwnd, IntPtr lParam) { MINMAXINFO mmi = (MINMAXINFO)Marshal.PtrToStructure(lParam, typeof(MINMAXINFO)); int MONITOR_DEFAULTTONEAREST = 0x00000002; IntPtr monitor = MonitorFromWindow(hwnd, MONITOR_DEFAULTTONEAREST); if (monitor != IntPtr.Zero) { MONITORINFO monitorInfo = new MONITORINFO(); GetMonitorInfo(monitor, monitorInfo); RECT rcWorkArea = monitorInfo.rcWork; RECT rcMonitorArea = monitorInfo.rcMonitor; mmi.ptMaxPosition.x = Math.Abs(rcWorkArea.left - rcMonitorArea.left); mmi.ptMaxPosition.y = Math.Abs(rcWorkArea.top - rcMonitorArea.top); mmi.ptMaxSize.x = Math.Abs(rcWorkArea.right - rcWorkArea.left); mmi.ptMaxSize.y = Math.Abs(rcWorkArea.bottom - rcWorkArea.top); } Marshal.StructureToPtr(mmi, lParam, true); } [DllImport("user32")] internal static extern bool GetMonitorInfo(IntPtr hMonitor, MONITORINFO lpmi); [DllImport("User32")] internal static extern IntPtr MonitorFromWindow(IntPtr handle, int flags); #region Nested type: MINMAXINFO [StructLayout(LayoutKind.Sequential)] internal struct MINMAXINFO { public POINT ptReserved; public POINT ptMaxSize; public POINT ptMaxPosition; public POINT ptMinTrackSize; public POINT ptMaxTrackSize; } #endregion #region Nested type: MONITORINFO [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)] internal class MONITORINFO { public int cbSize = Marshal.SizeOf(typeof(MONITORINFO)); public RECT rcMonitor; public RECT rcWork; public int dwFlags; } #endregion #region Nested type: POINT [StructLayout(LayoutKind.Sequential)] internal struct POINT { public int x; public int y; public POINT(int x, int y) { this.x = x; this.y = y; } } #endregion #region Nested type: RECT [StructLayout(LayoutKind.Sequential, Pack = 0)] internal struct RECT { public int left; public int top; public int right; public int bottom; public static readonly RECT Empty; public int Width { get { return Math.Abs(right - left); } } public int Height { get { return bottom - top; } } public RECT(int left, int top, int right, int bottom) { this.left = left; this.top = top; this.right = right; this.bottom = bottom; } public RECT(RECT rcSrc) { left = rcSrc.left; top = rcSrc.top; right = rcSrc.right; bottom = rcSrc.bottom; } public bool IsEmpty { get { return left >= right || top >= bottom; } } public override string ToString() { if (this == Empty) { return "RECT {Empty}"; } return "RECT { left : " + left + " / top : " + top + " / right : " + right + " / bottom : " + bottom + " }"; } public override bool Equals(object obj) { if (!(obj is Rect)) { return false; } return (this == (RECT)obj); } public override int GetHashCode() { return left.GetHashCode() + top.GetHashCode() + right.GetHashCode() + bottom.GetHashCode(); } public static bool operator ==(RECT rect1, RECT rect2) { return (rect1.left == rect2.left && rect1.top == rect2.top && rect1.right == rect2.right && rect1.bottom == rect2.bottom); } public static bool operator !=(RECT rect1, RECT rect2) { return !(rect1 == rect2); } } #endregion }通过调用WindowHelper.RepairWindowBehavior(Window)方法注册Win32消息事件，以后调用this.WindowState = WindowState.Maximized;就可以解决最大化避免覆盖任务栏的问题了。
