???????????У???????????????????????????????????????????????Stream????????????FileStream????????????????????????????????????????
??????δ???????????????????????????У?????
????SPFile f = rootFolder.Files.Add(fn?? filecontent)????????????ж???SPFolder???????????????????????????????У???????????????е?SPFolder?????ɡ?
????????????Щ?????????????????洢????????У????????????????Files.Add()?????SPFile????SPFile??????????? Item???????????????????????????SPListItem???????????????????????????θ????????????????У????ItemID??θ????
????????????????Ч?????1?????
???????1?????????????????????“??????????”????????2?????
?????2??“???????”?????п?????????1??????????????????????????????????????????????????????????????????????????????????????????????????