How to Hide the Close Button in a WPF Window While Keeping the

Hiding the Close Button in WPF Windows

In WPF, creating modal dialogs requires a window without a close button while maintaining a visible title bar. Despite exploring properties such as ResizeMode, WindowState, and WindowStyle, none of them fulfill this specific need.

To address this, you can utilize P/Invoke to manipulate the window's style and achieve the desired behavior. Here's how to do it:

1. Add the following declarations to your Window class:

   private const int GWL_STYLE = -16;
   private const int WS_SYSMENU = 0x80000;
   [DllImport("user32.dll", SetLastError = true)]
   private static extern int GetWindowLong(IntPtr hWnd, int nIndex);
   [DllImport("user32.dll")]
   private static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);

2. In the Window's Loaded event, include this code:

   var hwnd = new WindowInteropHelper(this).Handle;
   SetWindowLong(hwnd, GWL_STYLE, GetWindowLong(hwnd, GWL_STYLE) & ~WS_SYSMENU);

By executing this code, you'll successfully hide the close button from the title bar, ensuring a more intuitive modal dialog experience.

Important Considerations:

While this solution hides the close button visually, it does not prevent the user from closing the window using keyboard shortcuts (e.g., Alt F4) or via the taskbar. To prevent premature window closure, consider overriding the OnClosing event and setting Cancel to true.

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