[C#] Excel导出帮助类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using Excel = Microsoft.Office.Interop.Excel;

namespace Common
{
    public class ExcelHelper
    {
        public static string Pbint;
        /// <summary>
        /// 将DataTable中的数据导出到excel中
        /// </summary>
        /// <param name="dsT"></param>
        /// <param name="saveFileName">存储路径</param>
        /// <param name="bookname">表格头 可以为空串</param>
        /// <returns></returns>
        public static string ExportExcel(DataTable dsT, string saveFileName, string bookname)
        {
            DataSet ds1 = new DataSet();
            try
            {
                ds1.Tables.Add(dsT);  //datatable转为dataset
                //  gridbind();
                if (ds1 == null) return "表格为空";

                Excel.Application xlApp = new Excel.Application();
                object missing = System.Reflection.Missing.Value;

                if (xlApp == null)
                {
                    return ("无法创建Excel对象，可能您的计算机可能没有安装Excel");
                }
                Excel.Workbooks workbooks = xlApp.Workbooks;
                Excel.Workbook workbook = workbooks.Add(Excel.XlWBATemplate.xlWBATWorksheet);
                Excel.Worksheet worksheet = (Excel.Worksheet)workbook.Worksheets[1];//取得sheet1

                Excel.Range range;
                long totalCount = ds1.Tables[0].Rows.Count;
                long rowRead = 0;
                float percent = 0;

                //写入字段
                if (bookname == "")
                {
                    //写入标题
                    for (int i = 0; i < ds1.Tables[0].Columns.Count; i++)
                    {
                        worksheet.Cells[1, i + 1] = ds1.Tables[0].Columns[i].ColumnName;
                        range = (Excel.Range)worksheet.Cells[1, i + 1];
                        range.Interior.ColorIndex = 20;
                        range.Font.Bold = true;

                    }
                    //写入数值
                    for (int r = 0; r < ds1.Tables[0].Rows.Count; r++)
                    {
                        for (int i = 0; i < ds1.Tables[0].Columns.Count; i++)
                        {
                            worksheet.Cells[r + 2, i + 1] = ds1.Tables[0].Rows[r][i];
                        }
                        rowRead++;
                        percent = ((float)(100 * rowRead)) / totalCount;
                        Pbint = "正在导出数据[" + percent.ToString("0.00") + "%]...";
                    }
                    range = worksheet.Range[worksheet.Cells[1, 1], worksheet.Cells[ds1.Tables[0].Rows.Count + 1, ds1.Tables[0].Columns.Count]];
                    range.BorderAround(Excel.XlLineStyle.xlContinuous, Excel.XlBorderWeight.xlThin, Excel.XlColorIndex.xlColorIndexAutomatic, null);
                    range.Borders[Excel.XlBordersIndex.xlInsideHorizontal].ColorIndex = Excel.XlColorIndex.xlColorIndexAutomatic;
                    range.Borders[Excel.XlBordersIndex.xlInsideHorizontal].LineStyle = Excel.XlLineStyle.xlContinuous;
                    range.Borders[Excel.XlBordersIndex.xlInsideHorizontal].Weight = Excel.XlBorderWeight.xlThin;
                    if (ds1.Tables[0].Columns.Count > 1)
                    {
                        range.Borders[Excel.XlBordersIndex.xlInsideVertical].ColorIndex = Excel.XlColorIndex.xlColorIndexAutomatic;
                    }
                }
                else
                {
                    worksheet.Name = bookname;
                    worksheet.Cells[1, 1] = bookname;
                    range = (Excel.Range)worksheet.Cells[1, 1];
                    // range.Interior.ColorIndex = 10;
                    range.Font.Bold = true;
                    range.Font.Size = 12;
                    range.RowHeight = 22; //行高
                    // range.Columns .AutoFilter(); //自动列宽
                    for (int i = 0; i < ds1.Tables[0].Columns.Count; i++)
                    {
                        worksheet.Cells[2, i + 1] = ds1.Tables[0].Columns[i].ColumnName;
                        range = (Excel.Range)worksheet.Cells[2, i + 1];
                        range.Interior.ColorIndex = 15;
                        range.Font.Bold = true;
                    }
                    //写入数值
                    //  Caption.Visible = true;
                    for (int r = 0; r < ds1.Tables[0].Rows.Count; r++)
                    {
                        for (int i = 0; i < ds1.Tables[0].Columns.Count; i++)
                        {
                            worksheet.Cells[r + 3, i + 1] = ds1.Tables[0].Rows[r][i];
                        }
                        rowRead++;
                        percent = ((float)(100 * rowRead)) / totalCount;
                        Pbint = "正在导出数据[" + percent.ToString("0.00") + "%]...";
                        range = worksheet.Range[worksheet.Cells[2, 1], worksheet.Cells[ds1.Tables[0].Rows.Count + 2, ds1.Tables[0].Columns.Count]];
                        range.BorderAround(Excel.XlLineStyle.xlContinuous, Excel.XlBorderWeight.xlThin, Excel.XlColorIndex.xlColorIndexAutomatic, null);

                        range.Borders[Excel.XlBordersIndex.xlInsideHorizontal].ColorIndex = Excel.XlColorIndex.xlColorIndexAutomatic;
                        range.Borders[Excel.XlBordersIndex.xlInsideHorizontal].LineStyle = Excel.XlLineStyle.xlContinuous;
                        range.Borders[Excel.XlBordersIndex.xlInsideHorizontal].Weight = Excel.XlBorderWeight.xlThin;
                        if (ds1.Tables[0].Columns.Count > 1)
                        {
                            range.Borders[Excel.XlBordersIndex.xlInsideVertical].ColorIndex = Excel.XlColorIndex.xlColorIndexAutomatic;
                        }
                    }
                }
                workbook.SaveAs(saveFileName, Microsoft.Office.Interop.Excel.XlFileFormat.xlWorkbookNormal, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Excel.XlSaveAsAccessMode.xlNoChange, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
                workbook.Close(missing, missing, missing);
                xlApp.Quit();
            }
            catch(Exception ex)
            {
                return ex.Message;//“object”未包含“get_Range”的定义
            }
            return "导出完成！";
        }
    }
}

注意该方式可能会由于Office的版本问题，出现方法签名不一致的错误。

下面介绍通过NPOI方式下载文件的方式，该方式的优点是不需要服务器端安装Office软件。实现的思路是，首先用户请求ashx一般处理程序，一般处理程序会查询数据库，然后将数据库中的相关信息保存在DataTable中，再通过NPOI提供的接口方法，将DataTable中的数据保存到本地，生成一个Excel文件，最终ashx一般处理程序会生成一个URL链接，即为文件在服务器上的地址，前台ajax请求的success处理函数中将请求重定向到该URL链接，即可实现文件的下载。（注意需要下载NPOI.dll）

/// <summary>
/// 实体类集合导出到EXCLE2003
/// </summary>
/// <param name="enList">数据源</param>
/// <param name="sheetName">工作表名称</param>
/// <returns>文件的下载地址</returns>
public static string EntityListToExcel2003(DataTable dTable)
{
    try
    {
        string fileName = dTable.TableName + "-" + DateTime.Now.ToString("yyyyMMddHHmmssfff") + ".xls"; // 文件名称
        string urlPath = "/Files/Excels/" + fileName; // 文件下载的URL地址，供给前台下载
        string filePath = HttpContext.Current.Server.MapPath("\\" + urlPath); // 文件路径

        // 1.检测是否存在文件夹，若不存在就建立个文件夹
        string directoryName = Path.GetDirectoryName(filePath);
        if (!Directory.Exists(directoryName))
        {
            Directory.CreateDirectory(directoryName);
        }

        // 2.解析单元格头部
        HSSFWorkbook workbook = new HSSFWorkbook(); // 工作簿
        ISheet sheet = workbook.CreateSheet(dTable.TableName); // 工作表
        IRow row = sheet.CreateRow(0);
        // 设置列名称
        for (int i = 0; i < dTable.Columns.Count; i++)
        {
            row.CreateCell(i).SetCellValue(dTable.Columns[i].ColumnName);
        }

        // 3.List对象的值赋值到Excel的单元格里
        for (int i = 1; i <= dTable.Rows.Count; i++)
        {
            IRow rowTmp = sheet.CreateRow(i);
            for (int j = 0; j < dTable.Columns.Count; j++) // 根据指定的属性名称，获取对象指定属性的值
            {
                 string cellValue = dTable.Rows[i - 1][j].ToString(); // 单元格的值   
                 rowTmp.CreateCell(j).SetCellValue(cellValue);
            }
        }

        // 4.生成文件
        FileStream file = new FileStream(filePath, FileMode.Create);
        workbook.Write(file);
        file.Close();

        // 5.返回下载路径
        return urlPath;
    }
    catch (Exception ex)
    {
        throw ex;
    }
}

//数据导出
function toExcel() {
    $.ajax({
        url: '/JZ/JZHandler.ashx?action=ToExcel',
        type: 'POST',
        data: {
            JZId: $('#tt').tree('getRoot').text,
            Start: $('#dd1').datebox('getValue'),
            End: $('#dd2').datebox('getValue')
        },
        beforeSend: function () {
            $.messager.progress({
                text: '正在处理中...'
            })
        },
        success: function (data) {
            $.messager.progress('close');
                data = eval('(' + data + ')');      //通过重定向到文件的地址即可实现文件的下载
                location.href = data;
        }
    });
}