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  • Convert XLSX file to DataTable via NPOI

    static DataTable ReadExcelConvertToDataTable(string xlsxFileName)
            {
                DataTable dt = new DataTable();
                try
                {
                    IWorkbook book; 
                    using (FileStream fs = new FileStream(xlsxFileName, FileMode.Open, FileAccess.Read))
                    {
                        book = new XSSFWorkbook(fs);
                        ISheet st = book.GetSheetAt(0);
                        int rowsCount = st.LastRowNum; 
                        DataRow dtHeadersRow = dt.NewRow();
                        int colsCount = st.GetRow(0).Cells.Count();
    
                        var firstRow = st.GetRow(0);
                        for (int i = 0; i < colsCount; i++)
                        {
                            string colName = firstRow.GetCell(i).StringCellValue;
                            DataColumn dc = new DataColumn(colName);
                            dt.Columns.Add(colName);
                        }
                        dt.Rows.Add(dtHeadersRow);
                        for (int i = 0; i <= rowsCount; i++)
                        {
                            DataRow dr = dt.NewRow();                       
                            StringBuilder rowBuilder = new StringBuilder();
                            for (int j = 0; j < colsCount; j++)
                            {
                                ICell cell = st.GetRow(i).GetCell(j);
                                string cellValue = string.Empty;
                                if (cell != null)
                                {
                                    switch (cell.CellType)
                                    {
                                        case CellType.String:
                                            cellValue = cell.StringCellValue;
                                            break;
                                        case CellType.Numeric:
                                            cellValue = cell.NumericCellValue.ToString();
                                            break;
                                    }
                                }
                                dr[j] = cellValue;
                            }
                            dt.Rows.Add(dr);                        
                        }
                    }
                }
                catch(Exception ex)
                {
                    Console.WriteLine(ex.TargetSite);
                    return dt;                
                }
                return dt;
            }
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  • 原文地址:https://www.cnblogs.com/Fred1987/p/13196147.html
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