原文:
WPF自定义窗口最大化显示任务栏
当我们要自定义WPF窗口样式时，通常是采用设计窗口的属性 WindowStyle="None" ，然后为窗口自定义放大，缩小，关闭按钮的样式。
然而这样的话，当通过代码设置窗口（代码如下）放大时，窗口会把任务栏给遮档住。
private void Max_Click(object sender, RoutedEventArgs e) { if (this.WindowState != WindowState.Maximized) { this.WindowState = WindowState.Maximized; } else { this.WindowState = WindowState.Normal; } }
这样的问题想必也同样困绕着你。下面可以通过采用win32编程的方式把任务栏显示出来。Idea源于网络上的资料，如果你在其他地方找到类似的，那祝贺你！
首先你的窗口代码文件引用两个命名空间：
using WinInterop = System.Windows.Interop; using System.Runtime.InteropServices;
然后在窗口构造函数加入
this.SourceInitialized += new EventHandler(win_SourceInitialized);
win_SourceInitialized 函数及相关代码如下：
#region 最大化显示任务栏 void win_SourceInitialized(object sender, EventArgs e) { System.IntPtr handle = (new WinInterop.WindowInteropHelper(this)).Handle; WinInterop.HwndSource.FromHwnd(handle).AddHook(new WinInterop.HwndSourceHook(WindowProc)); } 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 monitor int 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); } /// <summary> /// POINT aka POINTAPI /// </summary> [StructLayout(LayoutKind.Sequential)] public struct POINT { /// <summary> /// x coordinate of point. /// </summary> public int x; /// <summary> /// y coordinate of point. /// </summary> public int y; /// <summary> /// Construct a point of coordinates (x,y). /// </summary> public POINT(int x, int y) { this.x = x; this.y = y; } } [StructLayout(LayoutKind.Sequential)] public struct MINMAXINFO { public POINT ptReserved; public POINT ptMaxSize; public POINT ptMaxPosition; public POINT ptMinTrackSize; public POINT ptMaxTrackSize; }; /// <summary> /// </summary> [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)] public class MONITORINFO { /// <summary> /// </summary> public int cbSize = Marshal.SizeOf(typeof(MONITORINFO)); /// <summary> /// </summary> public RECT rcMonitor = new RECT(); /// <summary> /// </summary> public RECT rcWork = new RECT(); /// <summary> /// </summary> public int dwFlags = 0; } /// <summary> Win32 </summary> [StructLayout(LayoutKind.Sequential, Pack = 0)] public struct RECT { /// <summary> Win32 </summary> public int left; /// <summary> Win32 </summary> public int top; /// <summary> Win32 </summary> public int right; /// <summary> Win32 </summary> public int bottom; /// <summary> Win32 </summary> public static readonly RECT Empty = new RECT(); /// <summary> Win32 </summary> public int Width { get { return Math.Abs(right - left); } // Abs needed for BIDI OS } /// <summary> Win32 </summary> public int Height { get { return bottom - top; } } /// <summary> Win32 </summary> public RECT(int left, int top, int right, int bottom) { this.left = left; this.top = top; this.right = right; this.bottom = bottom; } /// <summary> Win32 </summary> public RECT(RECT rcSrc) { this.left = rcSrc.left; this.top = rcSrc.top; this.right = rcSrc.right; this.bottom = rcSrc.bottom; } /// <summary> Win32 </summary> public bool IsEmpty { get { // BUGBUG : On Bidi OS (hebrew arabic) left > right return left >= right || top >= bottom; } } /// <summary> Return a user friendly representation of this struct </summary> public override string ToString() { if (this == RECT.Empty) { return "RECT {Empty}"; } return "RECT { left : " + left + " / top : " + top + " / right : " + right + " / bottom : " + bottom + " }"; } /// <summary> Determine if 2 RECT are equal (deep compare) </summary> public override bool Equals(object obj) { if (!(obj is Rect)) { return false; } return (this == (RECT)obj); } /// <summary>Return the HashCode for this struct (not garanteed to be unique)</summary> public override int GetHashCode() { return left.GetHashCode() + top.GetHashCode() + right.GetHashCode() + bottom.GetHashCode(); } /// <summary> Determine if 2 RECT are equal (deep compare)</summary> 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); } /// <summary> Determine if 2 RECT are different(deep compare)</summary> public static bool operator !=(RECT rect1, RECT rect2) { return !(rect1 == rect2); } } [DllImport("user32")] internal static extern bool GetMonitorInfo(IntPtr hMonitor, MONITORINFO lpmi); /// <summary> /// /// </summary> [DllImport("User32")] internal static extern IntPtr MonitorFromWindow(IntPtr handle, int flags); #endregion
最后F5，你会看到你所期望效果。
Thank you!
