摘要：
仅对有必填行数有有效 int countCol=0 // i为一定不为空的列 for (int i = 0; i <= headerRow.LastCellNum; i++) { if (sheet.GetRow(1).GetCell(i) == null) { break; } if (strin 阅读全文
摘要：
ex sql: SELECT a.Id,GROUP_CONCAT(b.Name) FROM A a LEFT JOIN B b on a.id=b.UID WHERE a.Id in ('xxx','yyy') GROUP BY a.Id C#: var test = db.Queryable<A, 阅读全文
