我已经解决了这个错误。
您可以使用手柄调整器或创建自己的调整大小控件，使用OnMouseDown 事件向HWND 发送消息以调整窗口大小，但它不会超过您之前为窗口定义的最小大小。
此代码将在最大化时限制窗口大小，以确保窗口永远不会超出屏幕或呈现在任务栏上。
这应该在 MainWindow.cs 代码的底部：
private const int WM_SYSCOMMAND = 0X112;
private HwndSource hwndSource;
enum SWP : uint
{
NOSIZE = 0x0001 ,
NOMOVE = 0x0002 ,
NOZORDER = 0x0004 ,
NOREDRAW = 0x0008 ,
NOACTIVATE = 0x0010 ,
FRAMECHANGED = 0x0020 ,
SHOWWINDOW = 0x0040 ,
HIDEWINDOW = 0x0080 ,
NOCOPYBITS = 0x0100 ,
NOOWNERZORDER = 0x0200 ,
NOSENDCHANGING = 0x0400 ,
}
public override void OnApplyTemplate()
{
System.IntPtr handle = ( new WindowInteropHelper( this ) ).Handle;
HwndSource.FromHwnd( handle ).AddHook( new HwndSourceHook( WindowProc ) );
}
private 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;
}
case 0x0046:
{
WINDOWPOS pos = ( WINDOWPOS )Marshal.PtrToStructure( lParam , typeof( WINDOWPOS ) );
if ( ( pos.flags & ( int )(SWP.NOMOVE) ) != 0 )
{
return IntPtr.Zero;
}
Window wnd = ( Window )HwndSource.FromHwnd( hwnd ).RootVisual;
if ( wnd == null )
{
return IntPtr.Zero;
}
bool changedPos = false;
if ( pos.cx < MinWidth ) { pos.cx = (int)MinWidth; changedPos = true; }
if ( pos.cy < MinHeight ) { pos.cy = ( int )MinHeight; changedPos = true; }
if ( !changedPos )
{
return IntPtr.Zero;
}
Marshal.StructureToPtr( pos , lParam , true );
handled = true;
break;
}
}
return ( System.IntPtr )0;
}
private void WmGetMinMaxInfo( System.IntPtr hwnd , System.IntPtr lParam )
{
MINMAXINFO mmi = ( MINMAXINFO )Marshal.PtrToStructure( lParam , typeof( MINMAXINFO ) );
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 );
}
[StructLayout( LayoutKind.Sequential )]
public struct POINT
{
public int x;
public int y;
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;
};
[StructLayout( LayoutKind.Sequential , CharSet = CharSet.Auto )]
public class MONITORINFO
{
public int cbSize = Marshal.SizeOf( typeof( MONITORINFO ) );
public RECT rcMonitor = new RECT();
public RECT rcWork = new RECT();
public int dwFlags = 0;
}
[StructLayout( LayoutKind.Sequential , Pack = 0 )]
public struct RECT
{
public int left;
public int top;
public int right;
public int bottom;
public static readonly RECT Empty = new RECT();
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 )
{
this.left = rcSrc.left;
this.top = rcSrc.top;
this.right = rcSrc.right;
this.bottom = rcSrc.bottom;
}
public bool IsEmpty
{
get
{
return left >= right || top >= bottom;
}
}
public override string ToString()
{
if ( this == RECT.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 );
}
}
[DllImport( "user32" )]
internal static extern bool GetMonitorInfo( IntPtr hMonitor , MONITORINFO lpmi );
[DllImport( "User32" )]
internal static extern IntPtr MonitorFromWindow( IntPtr handle , int flags );
[StructLayout( LayoutKind.Sequential )]
internal struct WINDOWPOS
{
public IntPtr hwnd;
public IntPtr hwndInsertAfter;
public int x;
public int y;
public int cx;
public int cy;
public int flags;
}
private void InitializeWindowSource( object sender , EventArgs e )
{
hwndSource = PresentationSource.FromVisual( ( Visual )sender ) as HwndSource;
}
public enum ResizeDirection
{
Left = 1 ,
Right = 2 ,
Top = 3 ,
TopLeft = 4 ,
TopRight = 5 ,
Bottom = 6 ,
BottomLeft = 7 ,
BottomRight = 8 ,
}
[DllImport( "user32" , CharSet = CharSet.Auto )]
private static extern IntPtr SendMessage( IntPtr hWnd , uint Msg , IntPtr wParam , IntPtr lParam );
private void ResizeWindow( ResizeDirection direction )
{
SendMessage( hwndSource.Handle , WM_SYSCOMMAND , ( IntPtr )( 61440 + direction ) , IntPtr.Zero );
}
并且不要忘记将此行添加到窗口的构造函数中，否则将无法正常工作：
SourceInitialized += new EventHandler( InitializeWindowSource );