How to use NPOI to read Excel spreadsheet that contains empty cells?

How to use NPOI to read Excel spreadsheet that contains empty cells?

Try the GetCell method with the MissingCellPolicy:

ICell cell = row.GetCell(2, MissingCellPolicy.RETURN_NULL_AND_BLANK);

https://github.com/tonyqus/npoi/blob/master/main/HSSF/UserModel/HSSFRow.cs#L444

 /// <summary>
        /// Get the hssfcell representing a given column (logical cell)
        /// 0-based.  If you ask for a cell that is not defined then
        /// you get a null, unless you have set a different
        /// MissingCellPolicy on the base workbook.
        /// </summary>
        /// <param name="cellnum">0 based column number</param>
        /// <returns>Cell representing that column or null if undefined.</returns>
        public ICell GetCell(int cellnum)
        {
            return GetCell(cellnum, book.MissingCellPolicy);
        }

https://github.com/tonyqus/npoi/blob/master/main/HSSF/UserModel/HSSFWorkbook.cs#L429

 [NonSerialized]
        private NPOI.SS.UserModel.MissingCellPolicy missingCellPolicy = NPOI.SS.UserModel.MissingCellPolicy.RETURN_NULL_AND_BLANK;
        /// <summary>
        /// Retrieves the current policy on what to do when
        /// getting missing or blank cells from a row.
        /// The default is to return blank and null cells.
        /// </summary>
        /// <value>The missing cell policy.</value>
        public NPOI.SS.UserModel.MissingCellPolicy MissingCellPolicy
        {
            get { return missingCellPolicy; }
            set { this.missingCellPolicy = value; }
        }

/// <summary>Missing cells are returned as null, Blank cells are returned as normal</summary>
        // Token: 0x04001517 RID: 5399
        public static readonly MissingCellPolicy RETURN_NULL_AND_BLANK = new MissingCellPolicy();

        /// <summary>Missing cells are returned as null, as are blank cells</summary>
        // Token: 0x04001518 RID: 5400
        public static readonly MissingCellPolicy RETURN_BLANK_AS_NULL = new MissingCellPolicy();

        /// <summary>A new, blank cell is Created for missing cells. Blank cells are returned as normal</summary>
        // Token: 0x04001519 RID: 5401
        public static readonly MissingCellPolicy CREATE_NULL_AS_BLANK = new MissingCellPolicy();