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  • NPOI 导出excel 通用方法

    public static byte[] ExportExcel<T>(Dictionary<string, string> columnsHeader, List<T> dataSource, string title = null, string footer = null)
            {
                IWorkbook workbook = new HSSFWorkbook();
                ISheet sheet = workbook.CreateSheet("Sheet1");
                sheet.DefaultColumnWidth = 15;
    
                IRow row;
                ICell cell;
    
                #region excel标题头
                int rowIndex = 0;
                if (!string.IsNullOrEmpty(title))
                {
                    ICellStyle cellStyle = workbook.CreateCellStyle();
                    cellStyle.VerticalAlignment = VerticalAlignment.Center;
                    cellStyle.Alignment = HorizontalAlignment.Center;
                    IFont font = workbook.CreateFont();
                    font.FontHeightInPoints = 12;
                    font.Boldweight = 700;
                    cellStyle.SetFont(font);
                    var region = new CellRangeAddress(0, 0, 0, columnsHeader.Keys.Count > 0 ? columnsHeader.Keys.Count - 1 : 0);
                    sheet.AddMergedRegion(region);
                    //合并单元格后样式
                    ((HSSFSheet)sheet).SetEnclosedBorderOfRegion(region, BorderStyle.Thin, NPOI.HSSF.Util.HSSFColor.Black.Index);
    
                    row = sheet.CreateRow(rowIndex);
                    row.HeightInPoints = 20;
                    cell = row.CreateCell(0);
                    cell.SetCellValue(title);
                    cell.CellStyle = cellStyle;
                    rowIndex++;
                }
                #endregion
    
                #region 列头
                row = sheet.CreateRow(rowIndex);
                row.HeightInPoints = 15;
                int cellIndex = 0;
                foreach (var value in columnsHeader.Values)
                {
                    ICellStyle cellStyle = workbook.CreateCellStyle();
                    cellStyle = workbook.CreateCellStyle();
                    cellStyle.BorderBottom = BorderStyle.Thin;
                    cellStyle.BorderLeft = BorderStyle.Thin;
                    cellStyle.BorderRight = BorderStyle.Thin;
                    cellStyle.BorderTop = BorderStyle.Thin;
                    //背景色
                    cellStyle.FillForegroundColor = HSSFColor.Grey25Percent.Index;
                    cellStyle.FillPattern = FillPattern.SolidForeground;
                    //水平垂直居中
                    cellStyle.VerticalAlignment = VerticalAlignment.Center;
                    cellStyle.Alignment = HorizontalAlignment.Center;
                    IFont font = workbook.CreateFont();
                    font.FontHeightInPoints = 10;
                    font.Boldweight = 700;
                    cellStyle.SetFont(font);
    
                    cell = row.CreateCell(cellIndex);
                    cell.CellStyle = cellStyle;
                    cell.SetCellValue(value);
                    cellIndex++;
                }
                rowIndex++;
                #endregion
    
                #region 主题内容
                
                //单元格样式 注:不要放循环里面,NPOI中调用workbook.CreateCellStyle()方法超过4000次会报错
                ICellStyle contentStyle = workbook.CreateCellStyle();
                contentStyle.BorderBottom = BorderStyle.Thin;
                contentStyle.BorderLeft = BorderStyle.Thin;
                contentStyle.BorderRight = BorderStyle.Thin;
                contentStyle.BorderTop = BorderStyle.Thin;
                contentStyle.VerticalAlignment = VerticalAlignment.Center;
                IFont contentFont = workbook.CreateFont();
                contentFont.FontHeightInPoints = 10;
                contentStyle.SetFont(contentFont);
    
                //日期格式样式
                ICellStyle dateStyle = workbook.CreateCellStyle();
                dateStyle.BorderBottom = BorderStyle.Thin;
                dateStyle.BorderLeft = BorderStyle.Thin;
                dateStyle.BorderRight = BorderStyle.Thin;
                dateStyle.BorderTop = BorderStyle.Thin;
                dateStyle.VerticalAlignment = VerticalAlignment.Center;
                dateStyle.SetFont(contentFont);
                IDataFormat format = workbook.CreateDataFormat();
                dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd");
                foreach (T item in dataSource)
                {
                    row = sheet.CreateRow(rowIndex);
                    row.HeightInPoints = 15;
                    rowIndex++;
                    Type type = item.GetType();
                    PropertyInfo[] properties = type.GetProperties();
                    if (properties.Length > 0)
                    {
                        cellIndex = 0;
                        foreach (var key in columnsHeader.Keys)
                        {
                            cell = row.CreateCell(cellIndex);
                            cell.CellStyle = contentStyle;
    
                            if (properties.Select(x => x.Name.ToLower()).Contains(key.ToLower()))
                            {
                                var property = properties.Where(x => x.Name.ToLower() == key.ToLower()).FirstOrDefault();
                                string drValue = property.GetValue(item) == null ? "" : property.GetValue(item).ToString();
                                //当类型类似DateTime?时
                                var fullType = property.PropertyType.Name == "Nullable`1" ? property.PropertyType.GetGenericArguments()[0].FullName : property.PropertyType.FullName;
                                switch (fullType)
                                {
                                    case "System.String": //字符串类型
                                        cell.SetCellValue(drValue);
                                        break;
                                    case "System.DateTime": //日期类型
                                        if (string.IsNullOrEmpty(drValue) || drValue == "0001/1/1 0:00:00")
                                        {
                                            cell.SetCellValue("");
                                        }
                                        else
                                        {
                                            DateTime dateV;
                                            DateTime.TryParse(drValue, out dateV);
                                            cell.SetCellValue(dateV);
                                            
                                            cell.CellStyle = dateStyle; //格式化显示
                                        }
                                        break;
                                    case "System.Boolean": //布尔型
                                        bool boolV = false;
                                        bool.TryParse(drValue, out boolV);
                                        cell.SetCellValue(boolV);
                                        break;
                                    case "System.Int16": //整型
                                    case "System.Int32":
                                    case "System.Int64":
                                    case "System.Byte":
                                        int intV = 0;
                                        int.TryParse(drValue, out intV);
                                        cell.SetCellValue(intV);
                                        break;
                                    case "System.Decimal": //浮点型
                                    case "System.Double":
                                        double doubV = 0;
                                        double.TryParse(drValue, out doubV);
                                        cell.SetCellValue(doubV);
                                        break;
                                    case "System.DBNull": //空值处理
                                        cell.SetCellValue("");
                                        break;
                                    default:
                                        cell.SetCellValue("");
                                        break;
                                }
                            }
                            cellIndex++;
                        }
                    }
    
                }
                #endregion
    
                #region 结尾行
                if (!string.IsNullOrEmpty(footer))
                {
                    ICellStyle cellStyle = workbook.CreateCellStyle();
                    cellStyle.VerticalAlignment = VerticalAlignment.Center;
                    cellStyle.Alignment = HorizontalAlignment.Center;
                    IFont font = workbook.CreateFont();
                    font.FontHeightInPoints = 10;
                    font.Boldweight = 700;
                    cellStyle.SetFont(font);
                    var region = new CellRangeAddress(rowIndex, rowIndex, 0, columnsHeader.Keys.Count > 0 ? columnsHeader.Keys.Count - 1 : 0);
                    sheet.AddMergedRegion(region);
                    //合并单元格后样式
                    ((HSSFSheet)sheet).SetEnclosedBorderOfRegion(region, BorderStyle.Thin, NPOI.HSSF.Util.HSSFColor.Black.Index);
    
                    row = sheet.CreateRow(rowIndex);
                    row.HeightInPoints = 18;
                    cell = row.CreateCell(0);
                    cell.SetCellValue(footer);
                    cell.CellStyle = cellStyle;
                }
                #endregion
    
                using (MemoryStream ms = new MemoryStream())
                {
                    workbook.Write(ms);
                    ms.Flush();
                    ms.Seek(0, SeekOrigin.Begin);
                    return ms.ToArray();
                    //或者直接导出不用返回值  var response = System.Web.HttpContext.Current.Response;
                    //response.ContentEncoding = System.Text.Encoding.GetEncoding("utf-8");
                    //response.ContentType = "application/vnd.ms-excel";
                    //response.AddHeader("Content-Disposition", "attachment;filename=" + fileName + ".xls");
                    //response.BinaryWrite(ms.ToArray());
                    //response.Buffer = true;
                    //response.Flush();
                    //response.End();
                }
            }

     Controller中调用:

    Dictionary<string, string> collection = new Dictionary<string, string>();
    collection.Add("字段名", "显示名");
    collection.Add("name", "姓名");
    collection.Add("age", "年龄");
    collection.Add("grade", "分数");
                
    var byteInfo = JXUtil.ExcelHelper.ExportExcel<Student>(collection, list);
    return File(byteInfo, "application/vnd.ms-excel", string.Format("记录-{0}.xls", DateTime.Now.ToString("yyyyMMddHHmm")));

    //无返回值直接调用    ExcelHelper.ExportExcel(collection, list, "广告位excel");
    

      

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  • 原文地址:https://www.cnblogs.com/flywing/p/5599795.html
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