Yes, i do realize Switzerland was Natural during the war, but neutrality didn't stop Kaiser Wilhelm II from taking Belgium during WWI and i never took Adolf Hitler to be one to play by the rules. Switzerland being dead center of Nazi Europe i always thought Hitler would have taken it. Can i have some Historian Input?
The FAQ has a thread dedicated to this specific topic entitled:
User /u/AC_7 gave a good overview in that thread of reasons that prevented, or better put postponed, the Nazi invasion of Switzerland during the war.