System.ConsolePal.ControlCHandlerRegistrar.Register C# (CSharp) Метод

            internal void Register()
            {
                Debug.Assert(!_handlerRegistered);

                bool r = Interop.Kernel32.SetConsoleCtrlHandler(_handler, true);
                if (!r)
                {
                    throw Win32Marshal.GetExceptionForLastWin32Error();
                }

                _handlerRegistered = true;
            }