S sjt Unregistered / Unconfirmed GUEST, unregistred user! 2001-05-30 #1 为什么不能用VarIsEmpty()去判断ClientDataset.Delta
T TYZhang Unregistered / Unconfirmed GUEST, unregistred user! 2001-05-30 #2 可以判断,但是必须先判断VarIsNull,然后才能判断VarIsEmpty,也就是说,如果 ClientDataset.Delta为Null则不能再判断VarIsEmpty。
S sjt Unregistered / Unconfirmed GUEST, unregistred user! 2001-05-31 #3 我用VarIsNull和VarIsEmpty都会出现异常!!!