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C#中怎么使用NPOI讀取excel轉為DataSet

發布時間:2022-02-22 14:37:41 來源:億速云 閱讀:286 作者:iii 欄目:開發技術

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

關于“C#中怎么使用NPOI讀取excel轉為DataSet”這篇文章的內容就介紹到這里,感謝各位的閱讀!相信大家對“C#中怎么使用NPOI讀取excel轉為DataSet”知識都有一定的了解,大家如果還想學習更多知識,歡迎關注億速云行業資訊頻道。

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