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這篇文章主要介紹了C#中怎么使用NPOI讀取excel轉為DataSet的相關知識,內容詳細易懂,操作簡單快捷,具有一定借鑒價值,相信大家閱讀完這篇C#中怎么使用NPOI讀取excel轉為DataSet文章都會有所收獲,下面我們一起來看看吧。
NPOI讀取excel轉為DataSet
/// <summary> /// 讀取Execl數據到DataTable(DataSet)中 /// </summary> /// <param name="filePath">指定Execl文件路徑</param> /// <param name="isFirstLineColumnName">設置第一行是否是列名</param> /// <returns>返回一個DataTable數據集</returns> public static DataSet ExcelToDataSet(string filePath, bool isFirstLineColumnName) { DataSet dataSet = new DataSet(); int startRow = 0; try { using (FileStream fs = File.OpenRead(filePath)) { IWorkbook workbook = null; // 如果是2007+的Excel版本 if (filePath.IndexOf(".xlsx") > 0) { workbook = new XSSFWorkbook(fs); } // 如果是2003-的Excel版本 else if (filePath.IndexOf(".xls") > 0) { workbook = new HSSFWorkbook(fs); } if (workbook != null) { //循環讀取Excel的每個sheet,每個sheet頁都轉換為一個DataTable,并放在DataSet中 for (int p = 0; p < workbook.NumberOfSheets; p++) { ISheet sheet = workbook.GetSheetAt(p); DataTable dataTable = new DataTable(); dataTable.TableName = sheet.SheetName; if (sheet != null) { int rowCount = sheet.LastRowNum;//獲取總行數 if (rowCount > 0) { IRow firstRow = sheet.GetRow(0);//獲取第一行 int cellCount = firstRow.LastCellNum;//獲取總列數 //構建datatable的列 if (isFirstLineColumnName) { startRow = 1;//如果第一行是列名,則從第二行開始讀取 for (int i = firstRow.FirstCellNum; i < cellCount; ++i) { ICell cell = firstRow.GetCell(i); if (cell != null) { if (cell.StringCellValue != null) { DataColumn column = new DataColumn(cell.StringCellValue); dataTable.Columns.Add(column); } } } } else { for (int i = firstRow.FirstCellNum; i < cellCount; ++i) { DataColumn column = new DataColumn("column" + (i + 1)); dataTable.Columns.Add(column); } } //填充行 for (int i = startRow; i <= rowCount; ++i) { IRow row = sheet.GetRow(i); if (row == null) continue; DataRow dataRow = dataTable.NewRow(); for (int j = row.FirstCellNum; j < cellCount; ++j) { ICell cell = row.GetCell(j); if (cell == null) { dataRow[j] = ""; } else { //CellType(Unknown = -1,Numeric = 0,String = 1,Formula = 2,Blank = 3,Boolean = 4,Error = 5,) switch (cell.CellType) { case CellType.Blank: dataRow[j] = ""; break; case CellType.Numeric: short format = cell.CellStyle.DataFormat; //對時間格式(2015.12.5、2015/12/5、2015-12-5等)的處理 if (format == 14 || format == 22 || format == 31 || format == 57 || format == 58) dataRow[j] = cell.DateCellValue; else dataRow[j] = cell.NumericCellValue; break; case CellType.String: dataRow[j] = cell.StringCellValue; break; } } } dataTable.Rows.Add(dataRow); } } } dataSet.Tables.Add(dataTable); } } } return dataSet; } catch (Exception ex) { var msg = ex.Message; return null; } }
Dataset 導出為Excel
/// <summary> /// 將DataTable(DataSet)導出到Execl文檔 /// </summary> /// <param name="dataSet">傳入一個DataSet</param> /// <param name="Outpath">導出路徑(可以不加擴展名,不加默認為.xls)</param> /// <returns>返回一個Bool類型的值,表示是否導出成功</returns> /// True表示導出成功,Flase表示導出失敗 public static bool DataTableToExcel(DataSet dataSet, string Outpath) { bool result = false; try { if (dataSet == null || dataSet.Tables == null || dataSet.Tables.Count == 0 || string.IsNullOrEmpty(Outpath)) throw new Exception("輸入的DataSet或路徑異常"); int sheetIndex = 0; //根據輸出路徑的擴展名判斷workbook的實例類型 IWorkbook workbook = null; string pathExtensionName = Outpath.Trim().Substring(Outpath.Length - 5); if (pathExtensionName.Contains(".xlsx")) { workbook = new XSSFWorkbook(); } else if(pathExtensionName.Contains(".xls")) { workbook = new HSSFWorkbook(); } else { Outpath = Outpath.Trim() + ".xls"; workbook = new HSSFWorkbook(); } //將DataSet導出為Excel foreach (DataTable dt in dataSet.Tables) { sheetIndex++; if (dt != null && dt.Rows.Count > 0) { ISheet sheet = workbook.CreateSheet(string.IsNullOrEmpty(dt.TableName) ? ("sheet" + sheetIndex) : dt.TableName);//創建一個名稱為Sheet0的表 int rowCount = dt.Rows.Count;//行數 int columnCount = dt.Columns.Count;//列數 //設置列頭 IRow row = sheet.CreateRow(0);//excel第一行設為列頭 for (int c = 0; c < columnCount; c++) { ICell cell = row.CreateCell(c); cell.SetCellValue(dt.Columns[c].ColumnName); } //設置每行每列的單元格, for (int i = 0; i < rowCount; i++) { row = sheet.CreateRow(i + 1); for (int j = 0; j < columnCount; j++) { ICell cell = row.CreateCell(j);//excel第二行開始寫入數據 cell.SetCellValue(dt.Rows[i][j].ToString()); } } } } //向outPath輸出數據 using (FileStream fs = File.OpenWrite(Outpath)) { workbook.Write(fs);//向打開的這個xls文件中寫入數據 result = true; } return result; } catch (Exception ex) { return false; } } }
調用方法
DataSet set = ExcelHelper.ExcelToDataTable("test.xlsx", true);//Excel導入 bool b = ExcelHelper.DataTableToExcel(set, "test2.xlsx");//導出Excel
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