1 需要引用的DLL
2 调用示例
public static void WriteExcel()
{string templateFile = @"F:\12312\excel.xlsx"; string outFile = @"F:\12312\" + DateTime.Now.ToString("yyyyMMddHHmmssfff") + ".xlsx";string picPath = @"F:\12312\test.jpg";IWorkbook workbook = ExcelHelper.GetReadWorkbook(templateFile);ISheet sheet = workbook.GetSheetAt(0);try{ExcelHelper.SetCellValue(sheet, 20, 0, "这里是第1行第1列内容");ExcelHelper.SetCellValue(sheet, 0, 1, "这里是第1行第2列内容");ExcelHelper.SetCellValue(sheet, 1, 0, "这里是第2行第1列内容");ExcelHelper.SetCellValue(sheet, 1, 1, "这里是第2行第2列内容");sheet.GetRow(1).Height = 44 * 20; sheet.SetColumnWidth(1, 50 * 256); ExcelHelper.SetCellValue(sheet, 2, 0, "这里是第3行第1列内容,需要设置字体样式");ExcelHelper.SetCellRangeAddress(sheet, 2, 5, 0, 3);ExcelHelper.AddRengionBorder(workbook, sheet, 2, 5, 0, 3);var bitmap = (Bitmap)Image.FromFile("1.bmp");ExcelHelper.InsertImage(workbook, sheet, 7, 16, 0, 2, bitmap);ExcelHelper.Save(workbook, outFile);Process.Start(outFile);}catch (Exception ex){throw ex;}
}
3 工具类
using System;
using System.Collections.Generic;
using System.Data;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.SS.Util;
using NPOI.XSSF.UserModel;namespace Demo_Excel
{public class ExcelHelper{public static IWorkbook GetReadWorkbook(string filename){FileStream fs = File.Open(filename, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);IWorkbook workbook;string fileExt = Path.GetExtension(filename).ToLower();switch (fileExt){case ".xlsx":workbook = new XSSFWorkbook(fs);break;case ".xls":workbook = new HSSFWorkbook(fs);break;default:throw new Exception("不支持的文件类型");}fs.Close();return workbook;}public static IWorkbook GetWriteWorkbook(string filename){if (string.IsNullOrWhiteSpace(filename))throw new Exception("不支持的文件类型");string fileExt = Path.GetExtension(filename).ToLower();switch (fileExt){case ".xlsx": return new XSSFWorkbook();case ".xls": return new HSSFWorkbook();default: throw new Exception("不支持的文件类型");}}public static void Save(IWorkbook workbook, string filename){MemoryStream stream = new MemoryStream();workbook.Write(stream);var buf = stream.ToArray();using (FileStream fs = new FileStream(filename, FileMode.Create, FileAccess.Write)){fs.Write(buf, 0, buf.Length);fs.Flush();fs.Close();}}public static int UpdataExcel(string sourcefile, string outfile, int sheetIndex, Dictionary<string, string> dictionary){var allKeys = dictionary.Keys.ToArray();IWorkbook workbook = GetReadWorkbook(sourcefile);ISheet sheet = workbook.GetSheetAt(sheetIndex);int endRow = sheet.LastRowNum;for (int i = 0; i < endRow; i++){var row = sheet.GetRow(i);for (int j = 0; j < row.LastCellNum; j++){var data = GetCellString(row.GetCell(j));if (allKeys.Contains(data)){row.Cells[j].SetCellValue(dictionary[data]);}}}Save(workbook, outfile);return 0;}public static int UpdataExcel(string sourcefile, string outfile, int sheetIndex, Dictionary<Point, string> dictionary){IWorkbook workbook = GetReadWorkbook(sourcefile);ISheet sheet = workbook.GetSheetAt(sheetIndex);foreach (var key in dictionary.Keys){SetCellValue(sheet, key.X, key.Y, dictionary[key]);}Save(workbook, outfile);return 0;}public static int Write(string fileName, DataTable data, string sheetName, bool isColumnWritten){try{IWorkbook workbook = GetWriteWorkbook(fileName);ISheet sheet = workbook.CreateSheet(sheetName);int count = 0;if (isColumnWritten){IRow rowHeader = sheet.CreateRow(count++);for (int i = 0; i < data.Columns.Count; i++){ICell cell = rowHeader.CreateCell(i);cell.SetCellValue(data.Columns[i].ColumnName);}}for (int i = 0; i < data.Rows.Count; i++){IRow rowData = sheet.CreateRow(count++);for (int j = 0; j < data.Columns.Count; j++){ICell cell = rowData.CreateCell(j);cell.SetCellValue(data.Rows[i][j].ToString());}}Save(workbook, fileName);return count;}catch (Exception ex){return -1;}}public static int Write(string fileName, DataTable data, bool isColumnWritten){int ret = Write(fileName, data, "Sheet1", isColumnWritten);return ret;}public static int Write(string fileName, DataTable data){int ret = Write(fileName, data, true);return ret;}public static int Read(string fileName, int sheetIndex, bool isFirstRowCellName, out DataTable data){data = new DataTable();try{IWorkbook workbook = GetReadWorkbook(fileName);ISheet sheet = workbook.GetSheetAt(sheetIndex);if (isFirstRowCellName){IRow firstRow = sheet.GetRow(0);var list = ReadDataRow(firstRow);data.Columns.AddRange(list.Select(t => new DataColumn(t)).ToArray());}else{int nMaxCol = 0;for (int i = 0; i < sheet.LastRowNum; i++){nMaxCol = Math.Max(nMaxCol, sheet.GetRow(i).LastCellNum);}for (int i = 0; i < nMaxCol; i++){data.Columns.Add($"列{i + 1}");}}int startRow = !isFirstRowCellName ? 0 : 1;int endRow = sheet.LastRowNum;var ret2 = Read(sheet, startRow, endRow, ref data);if (ret2 < 0) return -1;return data.Rows.Count;}catch (Exception ex){throw ex;}}public static int Read(string fileName, string sheetName, bool isFirstRowCellName, out DataTable data){data = new DataTable();try{IWorkbook workbook = GetReadWorkbook(fileName);ISheet sheet = workbook.GetSheet(sheetName);Console.WriteLine(sheet.SheetName);if (isFirstRowCellName){IRow firstRow = sheet.GetRow(0);var list = ReadDataRow(firstRow);data.Columns.AddRange(list.Select(t => new DataColumn(t)).ToArray());}else{int nMaxCol = 0;for (int i = 0; i < sheet.LastRowNum; i++){nMaxCol = Math.Max(nMaxCol, sheet.GetRow(i).LastCellNum);}for (int i = 0; i < nMaxCol; i++){data.Columns.Add($"列{i + 1}");}}int startRow = !isFirstRowCellName ? 0 : 1;int endRow = !isFirstRowCellName ? 0 : 1;var ret = Read(sheet, startRow, endRow, ref data);if (ret < 0)return -1;return data.Rows.Count;}catch (Exception ex){return -1;}}public static int Read(string fileName, bool isFirstRowCellName, out DataTable data){int ret = Read(fileName, "sheet1", isFirstRowCellName, out data);return ret;}public static int Read(string fileName, out DataTable data){int ret = Read(fileName, "sheet1", false, out data);return ret;}public static int Read(ISheet sheet, int startRow, int endRow, ref DataTable data){endRow += 1;for (int i = startRow; i < endRow; i++){var sheetRow = sheet.GetRow(i);if (sheetRow == null){data.Rows.Add();}else{var list = ReadDataRow(sheetRow);var row = data.NewRow();int count = Math.Min(list.Count, data.Columns.Count);for (int j = 0; j < count; j++){row[j] = list[j];}data.Rows.Add(row);}}return data.Rows.Count;}public static List<string> ReadDataRow(ISheet sheet, int index) => ReadDataRow(sheet.GetRow(index));public static List<string> ReadDataRow(IRow row){List<string> result = null;if (row != null){result = new List<string>();int startColumn = 0;int endColumn = row.LastCellNum;for (int i = startColumn; i < endColumn; i++){result.Add(GetCellString(row.GetCell(i)));}}return result;}public static void InsertImage(IWorkbook workbook, ISheet sheet, int firstRow, int lastRow, int firstCell, int lastCell, Bitmap bitmap){byte[] imgBytes = BitmapToBytes(bitmap);int pictureIdx = workbook.AddPicture(imgBytes, PictureType.PNG);if (workbook is XSSFWorkbook){XSSFDrawing patriarch = (XSSFDrawing)sheet.CreateDrawingPatriarch();XSSFClientAnchor anchor = new XSSFClientAnchor(10, 10, 0, 0, firstCell, firstRow, lastCell, lastRow);XSSFPicture pict = (XSSFPicture)patriarch.CreatePicture(anchor, pictureIdx);}else{HSSFPatriarch patriarch = (HSSFPatriarch)sheet.CreateDrawingPatriarch();HSSFClientAnchor anchor = new HSSFClientAnchor(10, 10, 0, 0, firstCell, firstRow, lastCell, lastRow);HSSFPicture pict = (HSSFPicture)patriarch.CreatePicture(anchor, pictureIdx);}}public static void SetCellValue(ISheet sheet, int rowIndex, int cellIndex, string value){if (sheet.GetRow(rowIndex) == null){sheet.CreateRow(rowIndex);}if (sheet.GetRow(rowIndex).GetCell(cellIndex) == null){sheet.GetRow(rowIndex).CreateCell(cellIndex);}sheet.GetRow(rowIndex).GetCell(cellIndex).SetCellValue(value);}public static void SetCellRangeAddress(ISheet sheet, int rowstart, int rowend, int colstart, int colend){for (int r = rowstart; r <= rowend; r++){for (int c = colstart; c <= colend; c++){if (sheet.GetRow(r) == null){sheet.CreateRow(r); }if (sheet.GetRow(r).GetCell(c) == null){sheet.GetRow(r).CreateCell(c); }}}CellRangeAddress cellRangeAddress = new CellRangeAddress(rowstart, rowend, colstart, colend);sheet.AddMergedRegion(cellRangeAddress);}public static void AddRengionBorder(IWorkbook workbook, ISheet sheet, int firstRow, int lastRow, int firstCell, int lastCell){for (int i = firstRow; i < lastRow; i++){for (int n = firstCell; n < lastCell; n++){ICell cell;cell = sheet.GetRow(i).GetCell(n);if (cell == null){cell = sheet.GetRow(i).CreateCell(n);}ICellStyle style = sheet.Workbook.CreateCellStyle();style.BorderTop = BorderStyle.Thin;style.BorderBottom = BorderStyle.Thin;style.BorderLeft = BorderStyle.Thin;style.BorderRight = BorderStyle.Thin;style.Alignment = HorizontalAlignment.Center; style.VerticalAlignment = VerticalAlignment.Center; if (i == firstRow) {style.FillForegroundColor = NPOI.HSSF.Util.HSSFColor.Black.Index; style.FillPattern = FillPattern.SolidForeground;IFont font = workbook.CreateFont(); font.Color = NPOI.HSSF.Util.HSSFColor.White.Index; font.FontHeightInPoints = 18;style.SetFont(font); }cell.CellStyle = style;}}}private static byte[] BitmapToBytes(Bitmap bitmap){MemoryStream ms = new MemoryStream();bitmap.Save(ms, ImageFormat.Bmp);ms.Seek(0, SeekOrigin.Begin);byte[] bytes = new byte[ms.Length];ms.Read(bytes, 0, bytes.Length);ms.Dispose();return bytes;}private static string GetCellString(ICell cell){if (cell != null){switch (cell.CellType){case CellType.Unknown:return "";case CellType.Numeric:return cell.NumericCellValue.ToString();case CellType.String:return cell.StringCellValue;case CellType.Formula:return cell.CellFormula;case CellType.Blank:return "";case CellType.Boolean:return cell.BooleanCellValue.ToString();case CellType.Error:return "";default:return "";}}else{return "";}}}}