How Can I Hide the Close Button in a WPF Window While Still Preserving the

Hiding the Close Button in WPF Windows

In WPF applications, creating modal dialogs often involves hiding the close button while preserving the title bar. While WPF lacks built-in properties for this specific purpose, it is possible to conceal the close button using a combination of P/Invoke and event handling.

To suppress the close button, begin by adding the necessary declarations:

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);

Next, in the Window's Loaded event, execute the following code:

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

This will hide the close button along with the window icon and system menu.

Important Considerations

Note that while this method hides the close button, it does not prevent users from closing the window through alternative means such as pressing Alt F4 or closing the application from the taskbar.

To completely prevent window closure before a certain condition is met, it is recommended to override the OnClosing event and set Cancel to true. This can be done in conjunction with the P/Invoke technique to provide a complete solution for disabling window closure.

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