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C# 导出 Excel 的各种方法总结

第一种：使用 Microsoft.Office.Interop.Excel.dll

首先需要安装 office 的 excel，然后再找到 Microsoft.Office.Interop.Excel.dll 组件，添加到引用。

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public void ExportExcel(DataTable dt)
        {
            if (dt != null)
            {
                Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application();
 
                if (excel == null)
                {
                    return;
                }
 
                //设置为不可见，操作在后台执行，为 true 的话会打开 Excel
                excel.Visible = false;
 
                //打开时设置为全屏显式
                //excel.DisplayFullScreen = true;
 
                //初始化工作簿
                Microsoft.Office.Interop.Excel.Workbooks workbooks = excel.Workbooks;
 
                //新增加一个工作簿，Add（）方法也可以直接传入参数 true
                Microsoft.Office.Interop.Excel.Workbook workbook = workbooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet);
                //同样是新增一个工作簿，但是会弹出保存对话框
                //Microsoft.Office.Interop.Excel.Workbook workbook = excel.Application.Workbooks.Add(true);
 
                //新增加一个 Excel 表(sheet)
                Microsoft.Office.Interop.Excel.Worksheet worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets[1];
 
                //设置表的名称
                worksheet.Name = dt.TableName;
                try
                {
                    //创建一个单元格
                    Microsoft.Office.Interop.Excel.Range range;
 
                    int rowIndex = 1;       //行的起始下标为 1
                    int colIndex = 1;       //列的起始下标为 1
 
                    //设置列名
                    for (int i = 0; i < dt.Columns.Count; i++)
                    {
                        //设置第一行，即列名
                        worksheet.Cells[rowIndex, colIndex + i] = dt.Columns[i].ColumnName;
 
                        //获取第一行的每个单元格
                        range = worksheet.Cells[rowIndex, colIndex + i];
 
                        //设置单元格的内部颜色
                        range.Interior.ColorIndex = 33;
 
                        //字体加粗
                        range.Font.Bold = true;
 
                        //设置为黑色
                        range.Font.Color = 0;
 
                        //设置为宋体
                        range.Font.Name = "Arial";
 
                        //设置字体大小
                        range.Font.Size = 12;
 
                        //水平居中
                        range.HorizontalAlignment = Microsoft.Office.Interop.Excel.XlHAlign.xlHAlignCenter;
 
                        //垂直居中
                        range.VerticalAlignment = Microsoft.Office.Interop.Excel.XlVAlign.xlVAlignCenter;
                    }
 
                    //跳过第一行，第一行写入了列名
                    rowIndex++;
 
                    //写入数据
                    for (int i = 0; i < dt.Rows.Count; i++)
                    {
                        for (int j = 0; j < dt.Columns.Count; j++)
                        {
                            worksheet.Cells[rowIndex + i, colIndex + j] = dt.Rows[i][j].ToString();
                        }
                    }
 
                    //设置所有列宽为自动列宽
                    //worksheet.Columns.AutoFit();
 
                    //设置所有单元格列宽为自动列宽
                    worksheet.Cells.Columns.AutoFit();
                    //worksheet.Cells.EntireColumn.AutoFit();
 
                    //是否提示，如果想删除某个sheet页，首先要将此项设为fasle。
                    excel.DisplayAlerts = false;
 
                    //保存写入的数据，这里还没有保存到磁盘
                    workbook.Saved = true;
 
                    //设置导出文件路径
                    string path = HttpContext.Current.Server.MapPath("Export/");
 
                    //设置新建文件路径及名称
                    string savePath = path + DateTime.Now.ToString("yyyy-MM-dd-HH-mm-ss") + ".xlsx";
 
                    //创建文件
                    FileStream file = new FileStream(savePath, FileMode.CreateNew);
 
                    //关闭释放流，不然没办法写入数据
                    file.Close();
                    file.Dispose();
 
                    //保存到指定的路径
                    workbook.SaveCopyAs(savePath);
 
                    //还可以加入以下方法输出到浏览器下载
                    FileInfo fileInfo = new FileInfo(savePath);
                    OutputClient(fileInfo);
                }
                catch(Exception ex)
                {
 
                }
                finally
                {
                    workbook.Close(false, Type.Missing, Type.Missing);
                    workbooks.Close();
 
                    //关闭退出
                    excel.Quit();
 
                    //释放 COM 对象
                    Marshal.ReleaseComObject(worksheet);
                    Marshal.ReleaseComObject(workbook);
                    Marshal.ReleaseComObject(workbooks);
                    Marshal.ReleaseComObject(excel);
 
                    worksheet = null;
                    workbook = null;
                    workbooks = null;
                    excel = null;
 
                    GC.Collect();
                }
            }
        }
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public void OutputClient(FileInfo file)
        {
            HttpContext.Current.Response.Buffer = true;
 
            HttpContext.Current.Response.Clear();
            HttpContext.Current.Response.ClearHeaders();
            HttpContext.Current.Response.ClearContent();
 
            HttpContext.Current.Response.ContentType = "application/vnd.ms-excel";
 
            //导出到 .xlsx 格式不能用时，可以试试这个
            //HttpContext.Current.Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
 
            HttpContext.Current.Response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}.xlsx", DateTime.Now.ToString("yyyy-MM-dd-HH-mm")));
 
            HttpContext.Current.Response.Charset = "GB2312";
            HttpContext.Current.Response.ContentEncoding = Encoding.GetEncoding("GB2312");
 
            HttpContext.Current.Response.AddHeader("Content-Length", file.Length.ToString());
 
            HttpContext.Current.Response.WriteFile(file.FullName);
            HttpContext.Current.Response.Flush();
 
            HttpContext.Current.Response.Close();
        }

第一种方法性能实在是不敢恭维，而且局限性太多。首先必须要安装 office（如果计算机上面没有的话），而且导出时需要指定文件保存的路径。也可以输出到浏览器下载，当然前提是已经保存写入数据。

 

第二种：使用 Aspose.Cells.dll

这个 Aspose.Cells 是 Aspose 公司推出的导出 Excel 的控件，不依赖 Office，商业软件，收费的。

可以参考：http://www.cnblogs.com/xiaofengfeng/archive/2012/09/27/2706211.html#top

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public void ExportExcel(DataTable dt)
        {
            try
            {
                //获取指定虚拟路径的物理路径
                string path = HttpContext.Current.Server.MapPath("DLL/") + "License.lic";
 
                //读取 License 文件
                Stream stream = (Stream)File.OpenRead(path);
 
                //注册 License
                Aspose.Cells.License li = new Aspose.Cells.License();
                li.SetLicense(stream);
 
                //创建一个工作簿
                Aspose.Cells.Workbook workbook = new Aspose.Cells.Workbook();
 
                //创建一个 sheet 表
                Aspose.Cells.Worksheet worksheet = workbook.Worksheets[0];
 
                //设置 sheet 表名称
                worksheet.Name = dt.TableName;
 
                Aspose.Cells.Cell cell;
 
                int rowIndex = 0;   //行的起始下标为 0
                int colIndex = 0;   //列的起始下标为 0
 
                //设置列名
                for (int i = 0; i < dt.Columns.Count; i++)
                {
                    //获取第一行的每个单元格
                    cell = worksheet.Cells[rowIndex, colIndex + i];
 
                    //设置列名
                    cell.PutValue(dt.Columns[i].ColumnName);
 
                    //设置字体
                    cell.Style.Font.Name = "Arial";
 
                    //设置字体加粗
                    cell.Style.Font.IsBold = true;
 
                    //设置字体大小
                    cell.Style.Font.Size = 12;
 
                    //设置字体颜色
                    cell.Style.Font.Color = System.Drawing.Color.Black;
 
                    //设置背景色
                    cell.Style.BackgroundColor = System.Drawing.Color.LightGreen;
                }
 
                //跳过第一行，第一行写入了列名
                rowIndex++;
 
                //写入数据
                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    for (int j = 0; j < dt.Columns.Count; j++)
                    {
                        cell = worksheet.Cells[rowIndex + i, colIndex + j];
 
                        cell.PutValue(dt.Rows[i][j]);
                    }
                }
 
                //自动列宽
                worksheet.AutoFitColumns();
 
                //设置导出文件路径
                path = HttpContext.Current.Server.MapPath("Export/");
 
                //设置新建文件路径及名称
                string savePath = path + DateTime.Now.ToString("yyyy-MM-dd-HH-mm-ss") + ".xlsx";
 
                //创建文件
                FileStream file = new FileStream(savePath, FileMode.CreateNew);
 
                //关闭释放流，不然没办法写入数据
                file.Close();
                file.Dispose();
 
                //保存至指定路径
                workbook.Save(savePath);
 
 
                //或者使用下面的方法，输出到浏览器下载。
                //byte[] bytes = workbook.SaveToStream().ToArray();
                //OutputClient(bytes);
 
                worksheet = null;
                workbook = null;
            }
            catch(Exception ex)
            {
 
            }
        }
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public void OutputClient(byte[] bytes)
        {
            HttpContext.Current.Response.Buffer = true;
 
            HttpContext.Current.Response.Clear();
            HttpContext.Current.Response.ClearHeaders();
            HttpContext.Current.Response.ClearContent();
 
            HttpContext.Current.Response.ContentType = "application/vnd.ms-excel";
            HttpContext.Current.Response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}.xls", DateTime.Now.ToString("yyyy-MM-dd-HH-mm")));
 
            HttpContext.Current.Response.Charset = "GB2312";
            HttpContext.Current.Response.ContentEncoding = Encoding.GetEncoding("GB2312");
 
            HttpContext.Current.Response.BinaryWrite(bytes);
            HttpContext.Current.Response.Flush();
 
            HttpContext.Current.Response.Close();
        }

设置单元格格式为文本方法：

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cell = worksheet.Cells[rowIndex, colIndex + i];
cell.PutValue(colNames[i]);
style = cell.GetStyle();
style.Number = 49;      // 49（text|@） 表示为文本
cell.SetStyle(style);

第二种方法性能还不错，而且操作也不复杂，可以设置导出时文件保存的路径，还可以保存为流输出到浏览器下载。

 

第三种：Microsoft.Jet.OLEDB

这种方法操作 Excel 类似于操作数据库。下面先介绍一下连接字符串：

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// Excel 2003 版本连接字符串
string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:/xxx.xls;Extended Properties='Excel 8.0;HDR=Yes;IMEX=2;'";
 
// Excel 2007 以上版本连接字符串
string strConn = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:/xxx.xlsx;Extended Properties='Excel 12.0;HDR=Yes;IMEX=2;'";

Provider：驱动程序名称

Data Source：指定 Excel 文件的路径

Extended Properties：Excel 8.0 针对 Excel 2000 及以上版本；Excel 12.0 针对 Excel 2007 及以上版本。

HDR：Yes 表示第一行包含列名,在计算行数时就不包含第一行。NO 则完全相反。

IMEX：0 写入模式；1 读取模式；2 读写模式。如果报错为“不能修改表 sheet1 的设计。它在只读数据库中”，那就去掉这个，问题解决。

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public void ExportExcel(DataTable dt)
        {
            OleDbConnection conn = null;
            OleDbCommand cmd = null;
 
            Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application();
 
            Microsoft.Office.Interop.Excel.Workbooks workbooks = excel.Workbooks;
 
            Microsoft.Office.Interop.Excel.Workbook workbook = workbooks.Add(true);
 
            try
            {
                //设置区域为当前线程的区域
                dt.Locale = System.Threading.Thread.CurrentThread.CurrentCulture;
 
                //设置导出文件路径
                string path = HttpContext.Current.Server.MapPath("Export/");
 
                //设置新建文件路径及名称
                string savePath = path + DateTime.Now.ToString("yyyy-MM-dd-HH-mm-ss") + ".xlsx";
 
                //创建文件
                FileStream file = new FileStream(savePath, FileMode.CreateNew);
 
                //关闭释放流，不然没办法写入数据
                file.Close();
                file.Dispose();
 
                //由于使用流创建的 excel 文件不能被正常识别，所以只能使用这种方式另存为一下。
                workbook.SaveCopyAs(savePath);
 
 
                // Excel 2003 版本连接字符串
                //string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source='" + savePath + "';Extended Properties='Excel 8.0;HDR=Yes;'";
 
                // Excel 2007 以上版本连接字符串
                string strConn = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source='"+ savePath + "';Extended Properties='Excel 12.0;HDR=Yes;'";
 
                //创建连接对象
                conn = new OleDbConnection(strConn);
                //打开连接
                conn.Open();
 
                //创建命令对象
                cmd = conn.CreateCommand();
 
                //获取 excel 所有的数据表。
                //new object[] { null, null, null, "Table" }指定返回的架构信息：参数介绍
                //第一个参数指定目录
                //第二个参数指定所有者
                //第三个参数指定表名
                //第四个参数指定表类型
                DataTable dtSheetName = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "Table" });
 
                //因为后面创建的表都会在最后面，所以本想删除掉前面的表，结果发现做不到，只能清空数据。
                for (int i = 0; i < dtSheetName.Rows.Count; i++)
                {
                    cmd.CommandText = "drop table [" + dtSheetName.Rows[i]["TABLE_NAME"].ToString() + "]";
                    cmd.ExecuteNonQuery();
                }
 
                //添加一个表，即 Excel 中 sheet 表
                cmd.CommandText = "create table " + dt.TableName + " ([S_Id] INT,[S_StuNo] VarChar,[S_Name] VarChar,[S_Sex] VarChar,[S_Height] VarChar,[S_BirthDate] VarChar,[C_S_Id] INT)";
                cmd.ExecuteNonQuery();
 
                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    string values = "";
 
                    for (int j = 0; j < dt.Columns.Count; j++)
                    {
                        values += "'" + dt.Rows[i][j].ToString() + "',";
                    }
 
                    //判断最后一个字符是否为逗号，如果是就截取掉
                    if (values.LastIndexOf(',') == values.Length - 1)
                    {
                        values = values.Substring(0, values.Length - 1);
                    }
 
                    //写入数据
                    cmd.CommandText = "insert into " + dt.TableName + " (S_Id,S_StuNo,S_Name,S_Sex,S_Height,S_BirthDate,C_S_Id) values (" + values + ")";
                    cmd.ExecuteNonQuery();
                }
 
                conn.Close();
                conn.Dispose();
                cmd.Dispose();
 
                //加入下面的方法，把保存的 Excel 文件输出到浏览器下载。需要先关闭连接。
                FileInfo fileInfo = new FileInfo(savePath);
                OutputClient(fileInfo);
            }
            catch (Exception ex)
            {
 
            }
            finally
            {
                workbook.Close(false, Type.Missing, Type.Missing);
                workbooks.Close();
                excel.Quit();
 
                Marshal.ReleaseComObject(workbook);
                Marshal.ReleaseComObject(workbooks);
                Marshal.ReleaseComObject(excel);
 
                workbook = null;
                workbooks = null;
                excel = null;
 
                GC.Collect();
            }
        }
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public void OutputClient(FileInfo file)
        {
            HttpResponse response = HttpContext.Current.Response;
 
            response.Buffer = true;
 
            response.Clear();
            response.ClearHeaders();
            response.ClearContent();
 
            response.ContentType = "application/vnd.ms-excel";
 
            //导出到 .xlsx 格式不能用时，可以试试这个
            //HttpContext.Current.Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
 
            response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}.xlsx", DateTime.Now.ToString("yyyy-MM-dd-HH-mm")));
 
            response.Charset = "GB2312";
            response.ContentEncoding = Encoding.GetEncoding("GB2312");
 
            response.AddHeader("Content-Length", file.Length.ToString());
 
            response.WriteFile(file.FullName);
            response.Flush();
 
            response.Close();
        }

这种方法需要指定一个已经存在的 Excel 文件作为写入数据的模板，不然的话就得使用流创建一个新的 Excel 文件，但是这样是没法识别的，那就需要用到 Microsoft.Office.Interop.Excel.dll 里面的 Microsoft.Office.Interop.Excel.Workbook.SaveCopyAs() 方法另存为一下，这样性能也就更差了。

使用操作命令创建的表都是在最后面的，前面的也没法删除（我是没有找到方法），当然也可以不再创建，直接写入数据也可以。

 

第四种：NPOI

NPOI 是 POI 项目的.NET版本，它不使用 Office COM 组件，不需要安装 Microsoft Office，目前支持 Office 2003 和 2007 版本。

NPOI 是免费开源的，操作也比较方便，下载地址：http://npoi.codeplex.com/

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public void ExportExcel(DataTable dt)
        {
            try
            {
                //创建一个工作簿
                IWorkbook workbook = new HSSFWorkbook();
 
                //创建一个 sheet 表
                ISheet sheet = workbook.CreateSheet(dt.TableName);
 
                //创建一行
                IRow rowH = sheet.CreateRow(0);
 
                //创建一个单元格
                ICell cell = null;
 
                //创建单元格样式
                ICellStyle cellStyle = workbook.CreateCellStyle();
 
                //创建格式
                IDataFormat dataFormat = workbook.CreateDataFormat();
 
                //设置为文本格式，也可以为 text，即 dataFormat.GetFormat("text");
                cellStyle.DataFormat = dataFormat.GetFormat("@");
 
                //设置列名
                foreach (DataColumn col in dt.Columns)
                {
                    //创建单元格并设置单元格内容
                    rowH.CreateCell(col.Ordinal).SetCellValue(col.Caption);
 
                    //设置单元格格式
                    rowH.Cells[col.Ordinal].CellStyle = cellStyle;
                }
 
                //写入数据
                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    //跳过第一行，第一行为列名
                    IRow row = sheet.CreateRow(i + 1);
 
                    for (int j = 0; j < dt.Columns.Count; j++)
                    {
                        cell = row.CreateCell(j);
                        cell.SetCellValue(dt.Rows[i][j].ToString());
                        cell.CellStyle = cellStyle;
                    }
                }
 
                //设置导出文件路径
                string path = HttpContext.Current.Server.MapPath("Export/");
 
                //设置新建文件路径及名称
                string savePath = path + DateTime.Now.ToString("yyyy-MM-dd-HH-mm-ss") + ".xls";
 
                //创建文件
                FileStream file = new FileStream(savePath, FileMode.CreateNew,FileAccess.Write);
 
                //创建一个 IO 流
                MemoryStream ms = new MemoryStream();
 
                //写入到流
                workbook.Write(ms);
 
                //转换为字节数组
                byte[] bytes = ms.ToArray();
 
                file.Write(bytes, 0, bytes.Length);
                file.Flush();
 
                //还可以调用下面的方法，把流输出到浏览器下载
                OutputClient(bytes);
 
                //释放资源
                bytes = null;
 
                ms.Close();
                ms.Dispose();
 
                file.Close();
                file.Dispose();
 
                workbook.Close();
                sheet = null;
                workbook = null;
            }
            catch(Exception ex)
            {
 
            }
        }
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public void OutputClient(byte[] bytes)
        {
            HttpResponse response = HttpContext.Current.Response;
 
            response.Buffer = true;
 
            response.Clear();
            response.ClearHeaders();
            response.ClearContent();
 
            response.ContentType = "application/vnd.ms-excel";
            response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}.xls", DateTime.Now.ToString("yyyy-MM-dd-HH-mm-ss")));
 
            response.Charset = "GB2312";
            response.ContentEncoding = Encoding.GetEncoding("GB2312");
 
            response.BinaryWrite(bytes);
            response.Flush();
 
            response.Close();
        }
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// 2007 版本创建一个工作簿
IWorkbook workbook = new XSSFWorkbook();
 
// 2003 版本创建一个工作簿
IWorkbook workbook = new HSSFWorkbook();

PS：操作 2003 版本需要添加 NPOI.dll 的引用，操作 2007 版本需要添加 NPOI.OOXML.dll 的引用。

 

第五种：GridView

直接使用 GridView 把 DataTable 的数据转换为字符串流，然后输出到浏览器下载。

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public void ExportExcel(DataTable dt)
        {
            HttpResponse response = HttpContext.Current.Response;
 
            response.Buffer = true;
 
            response.Clear();
            response.ClearHeaders();
            response.ClearContent();
 
            response.ContentType = "application/vnd.ms-excel";
            response.AddHeader("content-disposition", string.Format("attachment; filename={0}.xls", DateTime.Now.ToString("yyyy-MM-dd-HH-mm-ss")));
 
            response.Charset = "GB2312";
            response.ContentEncoding = Encoding.GetEncoding("GB2312");
 
            //实例化一个流
            StringWriter stringWrite = new StringWriter();
 
            //指定文本输出到流
            HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);
 
            GridView gv = new GridView();
            gv.DataSource = dt;
            gv.DataBind();
 
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                for (int j = 0; j < dt.Columns.Count; j++)
                {
                    //设置每个单元格的格式
                    gv.Rows[i].Cells[j].Attributes.Add("style", "vnd.ms-excel.numberformat:@");
                }
            }
 
            //把 GridView 的内容输出到 HtmlTextWriter
            gv.RenderControl(htmlWrite);
            
            response.Write(stringWrite.ToString());
            response.Flush();
 
            response.Close();
        }

这种方式导出 .xlsx 格式的 Excel 文件时，没办法打开。导出 .xls 格式的，会提示文件格式和扩展名不匹配，但是可以打开的。

 

第六种：DataGrid

其实这一种方法和上面的那一种方法几乎是一样的。

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public void ExportExcel(DataTable dt)
        {
            HttpResponse response = HttpContext.Current.Response;
 
            response.Buffer = true;
 
            response.Clear();
            response.ClearHeaders();
            response.ClearContent();
 
            response.ContentType = "application/vnd.ms-excel";
            response.AddHeader("content-disposition", string.Format("attachment; filename={0}.xls", DateTime.Now.ToString("yyyy-MM-dd-HH-mm-ss")));
 
            response.Charset = "GB2312";
            response.ContentEncoding = Encoding.GetEncoding("GB2312");
 
            //实例化一个流
            StringWriter stringWrite = new StringWriter();
 
            //指定文本输出到流
            HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);
 
            DataGrid dg = new DataGrid();
            dg.DataSource = dt;
            dg.DataBind();
 
            dg.Attributes.Add("style", "vnd.ms-excel.numberformat:@");
 
            //把 DataGrid 的内容输出到 HtmlTextWriter
            dg.RenderControl(htmlWrite);
 
            response.Write(stringWrite.ToString());
            response.Flush();
 
            response.Close();
        }

第七种：直接使用 IO 流

第一种方式，使用文件流在磁盘创建一个 Excel 文件，然后使用流写入数据。

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public void ExportExcel(DataTable dt)
        {
            //设置导出文件路径
            string path = HttpContext.Current.Server.MapPath("Export/");
 
            //设置新建文件路径及名称
            string savePath = path + DateTime.Now.ToString("yyyy-MM-dd-HH-mm-ss") + ".xls";
 
            //创建文件
            FileStream file = new FileStream(savePath, FileMode.CreateNew, FileAccess.Write);
            
            //以指定的字符编码向指定的流写入字符
            StreamWriter sw = new StreamWriter(file, Encoding.GetEncoding("GB2312"));
 
            StringBuilder strbu = new StringBuilder();
 
            //写入标题
            for (int i = 0; i < dt.Columns.Count; i++)
            {
                strbu.Append(dt.Columns[i].ColumnName.ToString() + "\t");
            }
            //加入换行字符串
            strbu.Append(Environment.NewLine);
 
            //写入内容
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                for (int j = 0; j < dt.Columns.Count; j++)
                {
                    strbu.Append(dt.Rows[i][j].ToString() + "\t");
                }
                strbu.Append(Environment.NewLine);
            }
 
            sw.Write(strbu.ToString());
            sw.Flush();
            file.Flush();
            
            sw.Close();
            sw.Dispose();
 
            file.Close();
            file.Dispose();
        }

第二种方式，这种方式就不需要在本地磁盘创建文件了，首先创建一个内存流写入数据，然后输出到浏览器下载。

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public void ExportExcel(DataTable dt)
        {
            //创建一个内存流
            MemoryStream ms = new MemoryStream();
 
            //以指定的字符编码向指定的流写入字符
            StreamWriter sw = new StreamWriter(ms, Encoding.GetEncoding("GB2312"));
 
            StringBuilder strbu = new StringBuilder();
 
            //写入标题
            for (int i = 0; i < dt.Columns.Count; i++)
            {
                strbu.Append(dt.Columns[i].ColumnName.ToString() + "\t");
            }
            //加入换行字符串
            strbu.Append(Environment.NewLine);
 
            //写入内容
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                for (int j = 0; j < dt.Columns.Count; j++)
                {
                    strbu.Append(dt.Rows[i][j].ToString() + "\t");
                }
                strbu.Append(Environment.NewLine);
            }
 
            sw.Write(strbu.ToString());
            sw.Flush();
 
            sw.Close();
            sw.Dispose();
 
            //转换为字节数组
            byte[] bytes = ms.ToArray();
 
            ms.Close();
            ms.Dispose();
 
            OutputClient(bytes);
        }
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public void OutputClient(byte[] bytes)
        {
            HttpResponse response = HttpContext.Current.Response;
 
            response.Buffer = true;
 
            response.Clear();
            response.ClearHeaders();
            response.ClearContent();
 
            response.ContentType = "application/vnd.ms-excel";
            response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}.xls", DateTime.Now.ToString("yyyy-MM-dd-HH-mm-ss")));
 
            response.Charset = "GB2312";
            response.ContentEncoding = Encoding.GetEncoding("GB2312");
 
            response.BinaryWrite(bytes);
            response.Flush();
 
            response.Close();
        }

这种方法有一个弊端，就是不能设置单元格的格式（至少我是没有找到，是在下输了）。

 

第八种：EPPlus

EPPlus 是一个使用 Open Office Xml 格式（xlsx）读取和写入 Excel 2007/2010 文件的 .net 库，并且免费开源。

下载地址：http://epplus.codeplex.com/

第一种方式，先使用文件流在磁盘创建一个 Excel 文件，然后打开这个文件写入数据并保存。

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public void ExportExcel(DataTable dt)
        {
            //新建一个 Excel 文件
            string path = HttpContext.Current.Server.MapPath("Export/");
            string filePath = path + DateTime.Now.ToString("yyyy-MM-dd-HH-mm-ss") + ".xlsx";
            FileStream fileStream = new FileStream(filePath, FileMode.Create);
 
            //加载这个 Excel 文件
            ExcelPackage package = new ExcelPackage(fileStream);
 
            // 添加一个 sheet 表
            ExcelWorksheet worksheet = package.Workbook.Worksheets.Add(dt.TableName);
 
            int rowIndex = 1;   // 起始行为 1
            int colIndex = 1;   // 起始列为 1
 
            //设置列名
            for (int i = 0; i < dt.Columns.Count; i++)
            {
                worksheet.Cells[rowIndex, colIndex + i].Value = dt.Columns[i].ColumnName;
 
                //自动调整列宽，也可以指定最小宽度和最大宽度
                worksheet.Column(colIndex + i).AutoFit();
            }
 
            // 跳过第一列列名
            rowIndex++;
 
            //写入数据
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                for (int j = 0; j < dt.Columns.Count; j++)
                {
                    worksheet.Cells[rowIndex + i, colIndex + j].Value = dt.Rows[i][j].ToString();
                }
 
                //自动调整行高
                worksheet.Row(rowIndex + i).CustomHeight = true;
            }
 
            //设置字体，也可以是中文，比如：宋体
            worksheet.Cells.Style.Font.Name = "Arial";
 
            //字体加粗
            worksheet.Cells.Style.Font.Bold = true;
 
            //字体大小
            worksheet.Cells.Style.Font.Size = 12;
 
            //字体颜色
            worksheet.Cells.Style.Font.Color.SetColor(System.Drawing.Color.Black);
 
            //单元格背景样式，要设置背景颜色必须先设置背景样式
            worksheet.Cells.Style.Fill.PatternType = ExcelFillStyle.Solid;
            //单元格背景颜色
            worksheet.Cells.Style.Fill.BackgroundColor.SetColor(System.Drawing.Color.DimGray);
 
            //设置单元格所有边框样式和颜色
            worksheet.Cells.Style.Border.BorderAround(ExcelBorderStyle.Thin, System.Drawing.ColorTranslator.FromHtml("#0097DD"));
 
            //单独设置单元格四边框 Top、Bottom、Left、Right 的样式和颜色
            //worksheet.Cells.Style.Border.Top.Style = ExcelBorderStyle.Thin;
            //worksheet.Cells.Style.Border.Top.Color.SetColor(System.Drawing.Color.Black);
 
            //垂直居中
            worksheet.Cells.Style.VerticalAlignment = ExcelVerticalAlignment.Center;
 
            //水平居中
            worksheet.Cells.Style.HorizontalAlignment = ExcelHorizontalAlignment.Center;
 
            //单元格是否自动换行
            worksheet.Cells.Style.WrapText = false;
 
            //设置单元格格式为文本
            worksheet.Cells.Style.Numberformat.Format = "@";
 
            //单元格自动适应大小
            worksheet.Cells.Style.ShrinkToFit = true;
 
            package.Save();
 
            fileStream.Close();
            fileStream.Dispose();
 
            worksheet.Dispose();
            package.Dispose();
        }

第二种方式，不指定文件，先创建一个 Excel 工作簿写入数据之后，可以选择保存至指定文件（新建文件）、保存为流、获取字节数组输出到浏览器下载。
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public void ExportExcel(DataTable dt)
        {
            //新建一个 Excel 工作簿
            ExcelPackage package = new ExcelPackage();
 
            // 添加一个 sheet 表
            ExcelWorksheet worksheet = package.Workbook.Worksheets.Add(dt.TableName);
 
            int rowIndex = 1;   // 起始行为 1
            int colIndex = 1;   // 起始列为 1
 
            //设置列名
            for (int i = 0; i < dt.Columns.Count; i++)
            {
                worksheet.Cells[rowIndex, colIndex + i].Value = dt.Columns[i].ColumnName;
 
                //自动调整列宽，也可以指定最小宽度和最大宽度
                worksheet.Column(colIndex + i).AutoFit();
            }
 
            // 跳过第一列列名
            rowIndex++;
 
            //写入数据
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                for (int j = 0; j < dt.Columns.Count; j++)
                {
                    worksheet.Cells[rowIndex + i, colIndex + j].Value = dt.Rows[i][j].ToString();
                }
 
                //自动调整行高
                worksheet.Row(rowIndex + i).CustomHeight = true;
            }
 
            //设置字体，也可以是中文，比如：宋体
            worksheet.Cells.Style.Font.Name = "Arial";
 
            //字体加粗
            worksheet.Cells.Style.Font.Bold = true;
 
            //字体大小
            worksheet.Cells.Style.Font.Size = 12;
 
            //字体颜色
            worksheet.Cells.Style.Font.Color.SetColor(System.Drawing.Color.Black);
 
            //单元格背景样式，要设置背景颜色必须先设置背景样式
            worksheet.Cells.Style.Fill.PatternType = ExcelFillStyle.Solid;
            //单元格背景颜色
            worksheet.Cells.Style.Fill.BackgroundColor.SetColor(System.Drawing.Color.DimGray);
 
            //设置单元格所有边框样式和颜色
            worksheet.Cells.Style.Border.BorderAround(ExcelBorderStyle.Thin, System.Drawing.ColorTranslator.FromHtml("#0097DD"));
 
            //单独设置单元格四边框 Top、Bottom、Left、Right 的样式和颜色
            //worksheet.Cells.Style.Border.Top.Style = ExcelBorderStyle.Thin;
            //worksheet.Cells.Style.Border.Top.Color.SetColor(System.Drawing.Color.Black);
 
            //垂直居中
            worksheet.Cells.Style.VerticalAlignment = ExcelVerticalAlignment.Center;
 
            //水平居中
            worksheet.Cells.Style.HorizontalAlignment = ExcelHorizontalAlignment.Center;
 
            //单元格是否自动换行
            worksheet.Cells.Style.WrapText = false;
 
            //设置单元格格式为文本
            worksheet.Cells.Style.Numberformat.Format = "@";
 
            //单元格自动适应大小
            worksheet.Cells.Style.ShrinkToFit = true;
 
 
            ////第一种保存方式
            //string path1 = HttpContext.Current.Server.MapPath("Export/");
            //string filePath1 = path1 + DateTime.Now.ToString("yyyy-MM-dd-HH-mm-ss") + ".xlsx";
            //FileStream fileStream1 = new FileStream(filePath1, FileMode.Create);
            ////保存至指定文件
            //FileInfo fileInfo = new FileInfo(filePath1);
            //package.SaveAs(fileInfo);
 
            ////第二种保存方式
            //string path2 = HttpContext.Current.Server.MapPath("Export/");
            //string filePath2 = path2 + DateTime.Now.ToString("yyyy-MM-dd-HH-mm-ss") + ".xlsx";
            //FileStream fileStream2 = new FileStream(filePath2, FileMode.Create);
            ////写入文件流
            //package.SaveAs(fileStream2);
 
 
            //创建一个内存流，然后转换为字节数组，输出到浏览器下载
            //MemoryStream ms = new MemoryStream();
            //package.SaveAs(ms);
            //byte[] bytes = ms.ToArray();
 
            //也可以直接获取流
            //Stream stream = package.Stream;
 
            //也可以直接获取字节数组
            byte[] bytes = package.GetAsByteArray();
 
            //调用下面的方法输出到浏览器下载
            OutputClient(bytes);
 
            worksheet.Dispose();
            package.Dispose();
        }
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public void OutputClient(byte[] bytes)
        {
            HttpResponse response = HttpContext.Current.Response;
 
            response.Buffer = true;
 
            response.Clear();
            response.ClearHeaders();
            response.ClearContent();
 
            //response.ContentType = "application/ms-excel";
            response.ContentType = "application/vnd.openxmlformats - officedocument.spreadsheetml.sheet";
            response.AppendHeader("Content-Type", "text/html; charset=GB2312");
            response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}.xlsx", DateTime.Now.ToString("yyyy-MM-dd-HH-mm-ss")));
 
            response.Charset = "GB2312";
            response.ContentEncoding = Encoding.GetEncoding("GB2312");
 
            response.BinaryWrite(bytes);
            response.Flush();
 
            response.End();
        }

这种方法创建文件和输出到浏览器下载都是可以支持 Excel .xlsx 格式的。更多相关属性设置，请参考：

 

from:https://www.cnblogs.com/Brambling/p/6854731.html

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