req.NumIid = 9629375236L; //寶貝地址欄中的id嗎？                //req.SkuId = 1230005L;                //req.OuterId = "1234";                req.Quantity = 1000L;                req.Type = 1L;                ItemQuantityUpdateR以上代碼中的變量賦值中帶個L是什么意思，怎么講int型的轉(zhuǎn)換為可以這樣賦值給Quantity？