我解決了這個錯誤。 您可以使用手柄調整大小或創建您自己的大小調整控件，使用OnMouseDown事件向HWND發送消息以調整窗口大小，同時不會超過先前爲窗口定義的最小大小。 此代碼將限制窗口大小，當最大化以及以確保該窗口永遠不會在屏幕之外或通過任務欄呈現。
這應該是在你的MainWindow.cs代碼底部：
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);
}
而且不要忘了加入這行到你的窗口的構造函數，否則任何規定工作：
SourceInitialized += new EventHandler(InitializeWindowSource);