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並前往https://www.syncfusion.com/faq/windowsforms/menus/how-do-i-cancel-a-context-menu-programatically

How do I cancel a context menu programatically? - Syncfusion

Handle, 0x001F/*WM_CANCELMODE*/, IntPtr.Zero, IntPtr.Zero); } [VB.Net] _ extern internal static IntPtr SendMessage(IntPtr hWnd, Integer msg, IntPtr wParam, ...

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查詢 「WM_CANCELMODE」的人也找了：

  1. wm_null
    2.
  2. wm_showwindow
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  3. wm_size
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  4. wm_ncactivate
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  5. wm_childactivate
    6.
  6. wm_close
    7.
  7. wm_activateapp
    8.
  8. wm_create
    9.