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

Hiding the Close Button in WPF Windows

Question: How can I hide the close button from a WPF window while maintaining a normal title bar?

WPF lacks a built-in option to remove the close button from a window's title bar. However, this can be achieved using P/Invoke:

Code:

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);

// In the Window's Loaded event
var hwnd = new WindowInteropHelper(this).Handle;
SetWindowLong(hwnd, GWL_STYLE, GetWindowLong(hwnd, GWL_STYLE) & ~WS_SYSMENU);

This code hides the close button, along with the window icon and system menu.

Note: This approach only hides the button. The window can still be closed using keyboard shortcuts or by closing the application.

To prevent the window from closing when a background thread is running, override the OnClosing method and set Cancel to true:

protected override void OnClosing(CancelEventArgs e)
{
    e.Cancel = true;
}

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