SQL??????????????
???????????? ???????[ 2016/8/16 10:08:53 ] ????????????? SQL
????????????????????SQL?????????????????????????:
???????????1.????????????????2.?????????????????
????3.?????????? class
????4.??????????????????????? ???????
????5.????????????????1????????????????????????????????????????????????????е???????????????????????????????????
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???????????η?private ??е? ?????????з???protected ??????? ??????????????????з???public ???е? ???κε???????????
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???????????д?????? ??????????
????this??????this??????????????????
??????2????У?????????????и??????????????? ??????????????????????????????ж?????? ?????и?????object??
????base?????
????sealed??????????? ????????????
??????????partial ?????????????????????????????????
????namespace ??????? ?????????????
??????3???????1.??????????????2.???ж???????????????????????????????????????????????????????д???????÷??????????????????????????????????м?? ?????????????????? ???????????????????д
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????1.??????????????????????????????????????????????????????????????2.this????????д???????棬????????????????????????????????????????? this????????????????????????????????β????????????????????????????????????????????????this?????
????3. is??????ж????????????????????if (y2 is Ren) { s = "???????";}else{ s = "?????????";}
????4. as???????????????????????????????????????????????????
????5.???????????и?????????????????????????????????? ???????????ж??????C#???????????????????object
????base?????????????д??????????÷???this????????????????й?????????????????й??????????????????????????????????????????????????????????????????base????????????? public China(string m):base(m){ }
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