前提：WindowStyle="None" ResizeMode="NoResize"
Step1:在窗体构造函数中加SourceInitialized事件
public MainWindow() { InitializeComponent(); SourceInitialized += MainWindow_SourceInitialized; }
Step2:事件处理
private void MainWindow_SourceInitialized(object sender, EventArgs e) { IntPtr handle = (new WinInterop.WindowInteropHelper(this)).Handle; WinInterop.HwndSource.FromHwnd(handle).AddHook(new WinInterop.HwndSourceHook(WindowProcHelper.WindowProc)); }
Step3:具体处理类WindowProcHelper
public class WindowProcHelper
{
public 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
#region old
//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);
#endregion
int widthFullScreen = 0;
int heightFullScreen = 0;
Screen screen = null;
if (SystemInformation.MonitorCount >= 1)
screen = Screen.FromHandle(hwnd);
if (screen != null)
{
widthFullScreen = screen.WorkingArea.Width;
heightFullScreen = screen.WorkingArea.Height;
}
else
{
widthFullScreen = Screen.PrimaryScreen.Bounds.Width;
heightFullScreen = Screen.PrimaryScreen.Bounds.Height;
}
mmi.ptMaxTrackSize.x = widthFullScreen + (int)(2*SystemParameters.FixedFrameVerticalBorderWidth);
mmi.ptMaxTrackSize.y = heightFullScreen + (int)(2 * SystemParameters.FixedFrameHorizontalBorderHeight);
Marshal.StructureToPtr(mmi,lParam,false);
}
/// <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);
}
参考：
https://docs.microsoft.com/en-us/archive/blogs/llobo/maximizing-window-with-windowstylenone-considering-taskbar
https://social.msdn.microsoft.com/Forums/en-US/37e66890-9dbb-4de9-a228-c35633c2974c/windowstatemaximized-hides-the-taskbar?forum=wpf