C# 未安装Office环境下使用NPOI导出Excel文件

1、NuGet直接安装NPOI程序包；

2、

using NPOI.XSSF.UserModel;

3、导出Excel代码：

        private void TsbExport2ExcelClick(object sender, EventArgs e)
        {
            //获取qrkey
            ToolStripButton tsbFiterBy = ((ToolStripButton)sender);
            long qryRKEY = Convert.ToInt64(tsbFiterBy.Name.Replace("TsbExport2Excel", string.Empty));
            QARRect qr = QryAndRptList.Find(q => q.QryRKEY == qryRKEY);
            if (qr == null)
            {
                MyMsg.Warning("没有找到查询定义条目,请关闭本窗体重试.");
                return;
            }

            A12DataGridView dgvAutoMain = (A12DataGridView)Controls.Find("DGVAutoMain" + qryRKEY, true)[0];
            if (dgvAutoMain == null) return;
            if (dgvAutoMain.Rows.Count <= 0)
            {
                MyMsg.Information("没有需要导出的数据,请检查.");
                return;
            }
            TabPage tabPage= (TabPage)Controls.Find("QryTpg" + qryRKEY, true)[0];
            string tagSheetName = tabPage.Text;
            string saveFileName = tabPage.Text + DateTime.Now.ToString("yyyy-MM-dd");

            var saveFileDialoge = new SaveFileDialog
            {
                FileName = saveFileName,
                Filter = "Excel Documents|*.xls;*.xlsx;*.xlsm",
                DefaultExt = ".xlsx"
            };
            if (saveFileDialoge.ShowDialog() != DialogResult.OK)
            {
                return;             
            }
            else 
            {
                saveFileName = saveFileDialoge.FileName;
                if (string.IsNullOrEmpty(saveFileName))
                {
                    return;
                }                    
            }
            if (File.Exists(saveFileName))
            {
                File.Delete(saveFileName);//因为在选取文件名称时就有提示是否覆盖，此处直接删除
            }
            //创建或匹配一个BackgroundWorker,初始化一个耗时任务
            BackgroundWorker bgwk = new BackgroundWorker();
            BgwkDef bgwkDef = new BgwkDef()
            {
                RunningAction = delegate () { Export2Excel(bgwk,dgvAutoMain, saveFileName, tagSheetName); },
                TagBgwk = bgwk
            };
            BeginBgwork(bgwkDef);
        }

        private void Export2Excel(BackgroundWorker bgwk, A12DataGridView tagDGV, string fullSaveFileName, string tagSheetName)
        {
            if (string.IsNullOrEmpty(fullSaveFileName)) return;
            try
            {
                bgwk.ReportProgress(1, "正在准备文档...");
                NPOI.SS.UserModel.IWorkbook tagWorkbook = new XSSFWorkbook();
                NPOI.SS.UserModel.ISheet tagSheet = tagWorkbook.CreateSheet(tagSheetName);//创建一个Sheet

                #region 标题行
                //创建标题行
                NPOI.SS.UserModel.IRow rowH = tagSheet.CreateRow(0);
                //创建单元格样式
                NPOI.SS.UserModel.ICellStyle cellStyle = tagWorkbook.CreateCellStyle();
                //创建格式
                NPOI.SS.UserModel.IDataFormat dataFormat = tagWorkbook.CreateDataFormat();

                //设置为文本格式，也可以为 text，即 dataFormat.GetFormat("text");
                cellStyle.DataFormat = dataFormat.GetFormat("@");
                cellStyle.FillForegroundColor = NPOI.SS.UserModel.IndexedColors.Yellow.Index;
                cellStyle.FillPattern = NPOI.SS.UserModel.FillPattern.SolidForeground;
                cellStyle.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center;
                cellStyle.VerticalAlignment = NPOI.SS.UserModel.VerticalAlignment.Center;
                cellStyle.BorderLeft = NPOI.SS.UserModel.BorderStyle.Hair;
                cellStyle.BorderTop = NPOI.SS.UserModel.BorderStyle.Hair;
                cellStyle.BorderRight = NPOI.SS.UserModel.BorderStyle.Hair;
                cellStyle.BorderBottom = NPOI.SS.UserModel.BorderStyle.Hair;
                //设置列名
                foreach (DataGridViewColumn col in tagDGV.Columns)
                {
                    //创建单元格并设置单元格内容
                    rowH.CreateCell(col.Index).SetCellValue(col.HeaderText);
                    rowH.Height = 20 * 20;

                    //设置单元格格式，宽度与Datagridview列宽匹配
                    rowH.Cells[col.Index].CellStyle = cellStyle;
                    tagSheet.SetColumnWidth(col.Index, OString.NZ2Int(col.Width / 7.5 * 356));
                }
                tagSheet.CreateFreezePane(0, 1, 0, 1);
                #endregion

                bgwk.ReportProgress(2, "正在准备数据...");
                DataTable DTTmp = OData.GetDTFromObject(tagDGV.DataSource).Copy();

                bgwk.ReportProgress(50, "正在写入数据到档案中...");
                //写入数据
                //创建一个单元格
                NPOI.SS.UserModel.ICell cell = null;
                int totColCount = DTTmp.Columns.Count;
                int totRowCount = DTTmp.Rows.Count;
                for (int i = 0; i < totRowCount; i++)
                {
                    //跳过第一行，第一行为列名
                    NPOI.SS.UserModel.IRow row = tagSheet.CreateRow(i + 1);
                    row.Height = 20* 20;
                    for (int j = 0; j < totColCount; j++)
                    {
                        cell = row.CreateCell(j);
                        #region 根据列类型写入值
                        Type clmDataType = DTTmp.Columns[j].DataType;
                        if ((clmDataType == typeof(char)) || (clmDataType == typeof(Guid))|| (clmDataType == typeof(string)))
                        {
                            cell.SetCellValue(OString.NZ2Str(DTTmp.Rows[i][j]));
                        }
                        else if(clmDataType == typeof(bool))
                        {
                            cell.SetCellValue(OString.NZ2Bool(DTTmp.Rows[i][j]));
                        }
                        else if ((clmDataType == typeof(byte)) || (clmDataType == typeof(decimal)) || (clmDataType == typeof(double)) || (clmDataType == typeof(short)) || (clmDataType == typeof(int)) || (clmDataType == typeof(long)) || (clmDataType == typeof(sbyte)) || (clmDataType == typeof(float)) || (clmDataType == typeof(TimeSpan)) || (clmDataType == typeof(ushort)) || (clmDataType == typeof(uint)) || (clmDataType == typeof(ulong)))
                        {
                            cell.SetCellValue(OString.NZ2Double(DTTmp.Rows[i][j]));
                        }
                        else if(clmDataType == typeof(DateTime))
                        {
                            cell.SetCellValue(Convert.ToDateTime(OString.NZ2DateTime(DTTmp.Rows[i][j])));
                            //创建单元格样式
                            NPOI.SS.UserModel.ICellStyle cellStyleValues = tagWorkbook.CreateCellStyle();
                            //创建格式
                            NPOI.SS.UserModel.IDataFormat dataFormatValues = tagWorkbook.CreateDataFormat();
                            if (cell.NumericCellValue.ToString().IndexOf('.') == -1)
                            {
                                cellStyleValues.DataFormat = dataFormatValues.GetFormat("yyyy-mm-dd");
                            }
                            else
                            {
                                cellStyleValues.DataFormat = dataFormatValues.GetFormat("yyyy-mm-dd hh:mm:ss");
                            }
                            //设置单元格格式
                            cell.CellStyle = cellStyleValues;
                        }
                        else
                        {
                            cell.SetCellValue(OString.NZ2Str(DTTmp.Rows[i][j]));
                        }
                        #endregion
                    }
                }

                bgwk.ReportProgress(95, "正在保存档案...");
                tagWorkbook.Write(new FileStream(fullSaveFileName, FileMode.Create, FileAccess.ReadWrite));

                bgwk.ReportProgress(100, "导出成功!");
                return;
            }
            catch (Exception ex)
            {
                CancelBgwork(bgwk);
                MyMsg.Exclamation("导出数据失败，请检查！",ex.Message);
                return;
            }
        }

这2段摘自框架的通用数据分析平台，其中采用了后台导出任务对话框，可以参考其它文章。