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本文介绍了ASP.NET下Excel下载模板、导入、导出操作，供大家参考，具体内容如下

1.下载模板功能

protected void btnDownload_Click(object sender, EventArgs e)

{

 var path = Server.MapPath(("upfiles\\") + "test.xlt"); //upfiles-文件夹 test.xlt-文件

 var name = "test.xlt";

 try

 {

 var file = new FileInfo(path);

 Response.Clear();

 Response.Charset = "GB2312";

 Response.ContentEncoding = System.Text.Encoding.UTF8;

 Response.AddHeader("Content-Disposition", "attachment; filename=" + Server.UrlEncode(name)); //头信息，指定默认文件名

 Response.AddHeader("Content-Length", file.Length.ToString());//显示下载进度

 Response.ContentType = "application/ms-excel"; // 指定返回的是一个不能被客户端读取的流，必须被下载

 Response.WriteFile(file.FullName); // 把文件流发送到客户端

 HttpContext.Current.ApplicationInstance.CompleteRequest();

 }

 catch (Exception ex)

 {

 Response.Write("<script>alert('错误:" + ex.Message + ",请尽快与管理员联系')</script>");

 }

}

2.导入数据

Excel数据导入到数据库中。 

protected void btnImport_Click(object sender, EventArgs e)

{

 if (FileUpload1.HasFile == false) //判断是否包含一个文件

 {

 Response.Write("<script>alert('请您选择Excel文件！')</script>");//未上传就点击了导入按钮

 return;

 }

 string isXls = Path.GetExtension(FileUpload1.FileName).ToString().ToLower();//获得文件的扩展名

 var extenLen = isXls.Length;

 if (!isXls.Contains(".xls")) //判断是否 是excel文件

 {

 Response.Write("<script>alert('只可以选择Excel文件！')</script>");

 return;

 }

 string filename = FileUpload1.FileName;  //获取Excle文件名

 string savePath = Server.MapPath(("upfiles\\") + filename);//Server.MapPath 获得虚拟服务器相对路径

 string savePath2 = Server.MapPath(("upfiles\\"));

 if (!Directory.Exists(savePath2)) //如果不存在upfiles文件夹则创建

 {

 Directory.CreateDirectory(savePath2);

 }

 FileUpload1.SaveAs(savePath); //SaveAs 将上传的文件内容保存在服务器上

 var ds = ExcelSqlConnection(savePath, filename);  //将Excel转成DataSet

 var dtRows = ds.Tables[0].Rows.Count;

 var dt = ds.Tables[0];

 if (dtRows == 0)

 {

 Response.Write("<script>alert('Excel表无数据！')</script>");

 return;

 }

 try

 {

 for(int i = 0; i < dt.Rows.Count; i++)

 {

  string ve = dt.Rows[i]["车号"].ToString();

  if (string.IsNullOrEmpty(ve)) //因数据库中车号不能为空 所以表格中车号为空的跳过这行

  {

  continue;

  }

  //用自己的方式保存进数据库ADO/EF/...

  var model = new TEST(); //实体

  model.id = 1;

  model.ve = ve;

  model.name = dt.Rows[i]["姓名"].ToString();

  model.Update();

 }

 }catch (Exception ex)

 {

 Response.Write("<script>alert('" + ex.Message + "')</script>"); 

 }

}

private DataSet ExcelSqlConnection(string savePath, string tableName)

{

 //string strCon = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + savePath + ";Extended Properties='Excel 8.0;HDR=YES;IMEX=1'";

 string strCon = "Provider=Microsoft.Ace.OLEDB.12.0;" + "data source=" + savePath + ";Extended Properties='Excel 12.0; HDR=Yes; IMEX=1'"; //HDR=YES Excel文件的第一行是列名而不是数据 IMEX=1可必免数据类型冲突

 var excelConn = new OleDbConnection(strCon);

 try

 {

 string strCom = string.Format("SELECT * FROM [Sheet1$]");

 excelConn.Open();

 OleDbDataAdapter myCommand = new OleDbDataAdapter(strCom, excelConn);

 DataSet ds = new DataSet();

 myCommand.Fill(ds, "[" + tableName + "$]");

 excelConn.Close();

 return ds;

 }

 catch (Exception)

 {

 excelConn.Close();

 //Response.Write("<script>alert('" + ex.Message + "')</script>");

 return null;

 }

}

3.导出数据到Excel中

插件采用MyXLS.

以下代码大部分基本不用改。 

private void Export()

{

 XlsDocument xls = new XlsDocument();

 org.in2bits.MyXls.Cell cell;

 int rowIndex = 2;

 xls.FileName = DateTime.Now.ToString().Replace("-", "").Replace(":", "").Replace(" ", "") + HttpUtility.UrlEncode("TEST") + ".xls"; //TEST要改

 Worksheet sheet = xls.Workbook.Worksheets.AddNamed("TEST");//状态栏标题名称

 org.in2bits.MyXls.Cells cells = sheet.Cells;

 #region 表头

 MergeArea area = new MergeArea(1, 1, 1, 2); //MergeArea(int rowMin, int rowMax, int colMin, int colMax)

 org.in2bits.MyXls.Cell cellTitle = cells.AddValueCell(1, 1, "TEST"); //Excel 第一行第1到2列显示TEST

 sheet.AddMergeArea(area);

 cellTitle.Font.Height = 20 * 20;

 cellTitle.Font.Bold = true;//设置标题行的字体为粗体

 cellTitle.Font.FontFamily = FontFamilies.Roman;//设置标题行的字体为FontFamilies.Roman

 cellTitle.HorizontalAlignment = HorizontalAlignments.Centered;

 area = new MergeArea(2, 2, 1, 1);

 cellTitle = cells.AddValueCell(2, 1, "车号"); //第二行第一列 显示车号

 sheet.AddMergeArea(area);

 cellTitle.Font.Bold = true;

 cellTitle.Font.Height = 16 * 16;

 cellTitle.Font.FontFamily = FontFamilies.Roman;

 cellTitle.HorizontalAlignment = HorizontalAlignments.Centered;

 cellTitle.VerticalAlignment = VerticalAlignments.Centered;

 cellTitle.TopLineStyle = 1;

 cellTitle.BottomLineStyle = 1;

 cellTitle.LeftLineStyle = 1;

 cellTitle.RightLineStyle = 1;

 area = new MergeArea(2, 2, 2, 2);

 cellTitle = cells.AddValueCell(2, 2, "姓名");

 sheet.AddMergeArea(area);

 cellTitle.Font.Bold = true;

 cellTitle.Font.Height = 16 * 16;

 cellTitle.Font.FontFamily = FontFamilies.Roman;

 cellTitle.HorizontalAlignment = HorizontalAlignments.Centered;

 cellTitle.VerticalAlignment = VerticalAlignments.Centered;

 cellTitle.TopLineStyle = 1;

 cellTitle.BottomLineStyle = 1;

 cellTitle.LeftLineStyle = 1;

 cellTitle.RightLineStyle = 1;

 #endregion

 var list = GetList(); //获取数据

 for (int i = 0; i < list.Count; i++)

 {

 rowIndex++;

 cell = cells.AddValueCell(rowIndex, 1, list[i].VehicleNO); //车号

 cell.TopLineStyle = 1;

 cell.BottomLineStyle = 1;

 cell.LeftLineStyle = 1;

 cell.RightLineStyle = 1;

 cell = cells.AddValueCell(rowIndex, 2, list[i].Name); //姓名

 cell.TopLineStyle = 1;

 cell.BottomLineStyle = 1;

 cell.LeftLineStyle = 1;

 cell.RightLineStyle = 1;

 }

 xls.Send();

}

4.错误-未在本地计算机上注册“Microsoft.ACE.OLEDB.12.0”提供程序

01.将平台换成X86

02.安装 AccessDatabaseEngine.exe(点击下载) 

5.错误-服务器无法在发送HTTP标头之后设置内容类型

给导出按钮增加'全局刷新'的能力。本文例子是aspx做的在<asp:UpdatePanel> 标签中 增加如下代码即可

代码如下:

<Triggers>

    <%--<asp:AsyncPostBackTrigger ControlID="" />--%> <%--局部刷新 值刷新UpdatePanel内部 --%>

   <asp:PostBackTrigger ControlID="btnExport" /> <%--全部刷新 --%> <%--2016年7月1日 解决点击导出按钮报错“服务器无法在发送HTTP标头之后设置内容类型”的错误--%>

</Triggers>

以上就是本文的全部内容，希望对大家的学习有所帮助