private static System.IntPtr WindowProc(System.IntPtr hwnd,int msg,System.IntPtr wParam,System.IntPtr lParam,ref bool handled)
{switch (msg){case 0x0024:WmGetMinMaxInfo(hwnd, lParam);handled = true;break;}return (System.IntPtr)0;
}private static void WmGetMinMaxInfo(System.IntPtr hwnd, System.IntPtr lParam)
{            MINMAXINFO mmi = (MINMAXINFO)Marshal.PtrToStructure(lParam, typeof(MINMAXINFO));// Adjust the maximized size and position to fit the work area of the correct monitorint MONITOR_DEFAULTTONEAREST =0x00000002;System.IntPtr monitor = MonitorFromWindow(hwnd, MONITOR_DEFAULTTONEAREST);if (monitor != System.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);
}

调用API WmGetMinMaxInfo可获取当前桌面的“最大化”窗口的大小。

[DllImport("user32")]
internal static extern bool GetMonitorInfo(IntPtr hMonitor, MONITORINFO   lpmi);
[DllImport("User32")]
internal static extern IntPtr MonitorFromWindow(IntPtr handle, int flags);

调用GetMonitorInfo将获得一个MONITORINFO对象，如果您仔细查看代码，它实际上是以这样一种方式来定位窗口的：它完全根据矩形区域的高度和宽度调整自己的大小。

public override void OnApplyTemplate(){System.IntPtr handle = (new WinInterop.WindowInteropHelper(this)).Handle;WinInterop.HwndSource.FromHwnd(handle).AddHook(new WinInterop.HwndSourceHook(WindowProc));}

要调用此方法，我可以使用SourceInitialized事件，它最终将在修改WindowState时调用。

win.SourceInitialized += new EventHandler(win_SourceInitialized);void win_SourceInitialized(object sender, EventArgs e)
{System.IntPtr handle = (new WinInterop.WindowInteropHelper(this)).Handle;WinInterop.HwndSource.FromHwnd(handle).AddHook(new WinInterop.HwndSourceHook(WindowProc));
}

设置窗口的属性

WindowStyle="None"
WindowState="Maximized"
ResizeMode="NoResize"

转到您的代码，然后根据PrimaryScreen width和height调整窗口大小。另外，还要确保你为窗口设置了Left和Top。

this.Width = System.Windows.SystemParameters.WorkArea.Width;
this.Height = System.Windows.SystemParameters.WorkArea.Height;
this.Left = 0;
this.Top = 0;
this.WindowState = WindowState.Normal;

Normal 将确保该窗口的默认行为被覆盖，并使任务栏重新出现。