按钮 "帮助"?

它很容易，只需将此代码插入您的课程 Window.

此代码使用 interop 删除样式 WS_MINIMIZEBOX 和 WS_MAXIMIZEBOX 并添加扩展样式 WS_EX_CONTEXTHELP /只有在删除折叠并部署按钮时，才会出现问号/.

EDIT: 添加单击“帮助”按钮，这是通过连接完成的 WndProc 通过 HwndSource.AddHook 并听取消息 WM_SYSCOMMAND 通过 wParam SC_CONTEXTHELP.

检测到单击时，此代码将通过将其更改为事件，重定向的事件甚至命令来显示消息窗口 /为了 MVVM 应用程序/, 留下读者的锻炼。

private const uint WS_EX_CONTEXTHELP = 0x00000400;

private const uint WS_MINIMIZEBOX = 0x00020000;

private const uint WS_MAXIMIZEBOX = 0x00010000;

private const int GWL_STYLE = -16;

private const int GWL_EXSTYLE = -20;

private const int SWP_NOSIZE = 0x0001;

private const int SWP_NOMOVE = 0x0002;

private const int SWP_NOZORDER = 0x0004;

private const int SWP_FRAMECHANGED = 0x0020;

private const int WM_SYSCOMMAND = 0x0112;

private const int SC_CONTEXTHELP = 0xF180;





[DllImport/"user32.dll"/]

private static extern uint GetWindowLong/IntPtr hwnd, int index/;



[DllImport/"user32.dll"/]

private static extern int SetWindowLong/IntPtr hwnd, int index, uint newStyle/;



[DllImport/"user32.dll"/]

private static extern bool SetWindowPos/IntPtr hwnd, IntPtr hwndInsertAfter, int x, int y, int width, int height, uint flags/;





protected override void OnSourceInitialized/EventArgs e/

{

 base.OnSourceInitialized/e/;

 IntPtr hwnd = new System.Windows.Interop.WindowInteropHelper/this/.Handle;

 uint styles = GetWindowLong/hwnd, GWL_STYLE/;

 styles &= 0xFFFFFFFF ^ /WS_MINIMIZEBOX | WS_MAXIMIZEBOX/;

 SetWindowLong/hwnd, GWL_STYLE, styles/;

 styles = GetWindowLong/hwnd, GWL_EXSTYLE/;

 styles |= WS_EX_CONTEXTHELP;

 SetWindowLong/hwnd, GWL_EXSTYLE, styles/;

 SetWindowPos/hwnd, IntPtr.Zero, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER | SWP_FRAMECHANGED/; 

 //HwndSource/PresentationSource.FromVisual/this//.AddHook/HelpHook/;

}



private IntPtr HelpHook/IntPtr hwnd,

 int msg,

 IntPtr wParam,

 IntPtr lParam,

 ref bool handled/

{

 if /msg == WM_SYSCOMMAND &&

 //int/wParam & 0xFFF0/ == SC_CONTEXTHELP/

 {

 MessageBox.Show/"help"/;

 handled = true;

 }

 return IntPtr.Zero;

}

没有帮助按钮离开盒子 WPF. 然而，它应该是一个震惊来变成自己的震惊。