string sqlAdd = string.Format("insert into {0} (DataName, DataDate, DataInfo, DataUrl) values ('{1}', '{2}', '{3}', '{4}')", str_Table, str_DataName, str_DataDate, str_DataInfo, str_DataUrl);
格式化字符串

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string sqlAdd = string.Format("insert into {0} (DataName, DataDate, DataInfo, DataUrl) values ('{1}', '{2}', '{3}', '{4}')", str_Table, str_DataName, str_DataDate, str_DataInfo, str_DataUrl);