WebBrowserExtensionsDestroyWindow Method

Manually call https://docs.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-destroywindow passing in the handle returned from GetWindowHandle. This method can be used to manually close the underlying CefBrowser instance. This will avoid the WM_Close message that CEF sends by default to the top level window. (Which closes your application). This method should generally only be used in the WinForms version.

public static bool DestroyWindow(
	this IWebBrowser chromiumWebBrowser
)

public:
[ExtensionAttribute]
static bool DestroyWindow(
	IWebBrowser^ chromiumWebBrowser
)

//Invoke on the CEF UI Thread
Cef.UIThreadTaskFactory.StartNew(() =>
{
  var closed = chromiumWebBrowser.DestroyWindow();
});