using NPOI.HSSF.UserModel; using NPOI.SS.UserModel; using System; using System.Collections.Generic; using System.Data; using System.IO; using System.Linq; using System.Text; namespace LeaRun.Utilities { public static class NpoiHelper { public static Stream RenderDataTableToExcel(DataTable SourceTable) { HSSFWorkbook workbook = new HSSFWorkbook(); MemoryStream ms = new MemoryStream(); ISheet sheet = workbook.CreateSheet(); IRow headerRow = sheet.CreateRow(0); // handling header. foreach (DataColumn column in SourceTable.Columns) headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName); // handling value. int rowIndex = 1; foreach (DataRow row in SourceTable.Rows) { IRow dataRow = sheet.CreateRow(rowIndex); foreach (DataColumn column in SourceTable.Columns) { dataRow.CreateCell(column.Ordinal).SetCellValue(row[column].ToString()); } rowIndex++; } workbook.Write(ms); ms.Flush(); ms.Position = 0; sheet = null; headerRow = null; workbook = null; return ms; } public static DataTable RenderDataTableFromExcel(Stream ExcelFileStream, int SheetIndex, int HeaderRowIndex) { HSSFWorkbook workbook = new HSSFWorkbook(ExcelFileStream); ISheet sheet = workbook.GetSheetAt(SheetIndex); DataTable table = new DataTable(); IRow headerRow = sheet.GetRow(HeaderRowIndex); int cellCount = headerRow.LastCellNum; for (int i = headerRow.FirstCellNum; i < cellCount; i++) { DataColumn column = new DataColumn(headerRow.GetCell(i).StringCellValue); table.Columns.Add(column); } int rowCount = sheet.LastRowNum; for (int i = (sheet.FirstRowNum + 1); i <= sheet.LastRowNum; i++) { IRow row = sheet.GetRow(i); DataRow dataRow = table.NewRow(); for (int j = row.FirstCellNum; j < cellCount; j++) { if (row.GetCell(j) != null) dataRow[j] = row.GetCell(j).ToString(); } table.Rows.Add(dataRow); } ExcelFileStream.Close(); workbook = null; sheet = null; return table; } } }