JSON数组如何去除中括号两旁的双引号

"RoomDetailList":"[{\"PSMemo\":\"0\",\"Name\":\"0\",\"Code\":\"4444\",\"ModelNo\":\"4\",\"Num\":\"4\",\"UnitPrice\":\"4\",\"Memo\":\"4\"},{\"PSMemo\":\"0\",\"Name\":\"0\",\"Code\":\"4444\",\"ModelNo\":\"4\",\"Num\":\"4\",\"UnitPrice\":\"4\",\"Memo\":\"4\"}]"