导出excel文件出现的问题

代码如下
Scores score = new Scores();        //创建Scores对象
        DataSet ds = score.QueryScore();     //调用QueryScore方法查询成绩并将查询结果放到DataSet数据集中
        DataTable DT = ds.Tables[0];
        //生成将要存放结果的Excel文件的名称
        string NewFileName = DateTime.Now.ToString("yyyyMMddHHmmss") + ".xls";
        //转换为物理路径
        NewFileName = Server.MapPath("Temp/" + NewFileName);
        //根据模板正式生成该Excel文件
        File.Copy(Server.MapPath("../Module01.xls"), NewFileName, true);
        //建立指向该Excel文件的数据库连接
        string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + NewFileName + ";Extended Properties='Excel 8.0;'";
        OleDbConnection Conn = new OleDbConnection(strConn);
        //打开连接，为操作该文件做准备
        Conn.Open();
        OleDbCommand Cmd = new OleDbCommand("", Conn);        foreach (DataRow DR in DT.Rows)
        {
            string XSqlString = "insert into [Sheet1$]";
            XSqlString += "([用户姓名],[试卷],[成绩],[考试时间]) values(";
            XSqlString += "'" + DR["UserName"] + "',";
            XSqlString += "'" + DR["PaperName"] + "',";
            XSqlString += "'" + DR["Score"] + "',";
            XSqlString += "'" + DR["ExamTime"] + "')";
            Cmd.CommandText = XSqlString;
            Cmd.ExecuteNonQuery();
        }        //操作结束，关闭连接
        Conn.Close();
        //打开要下载的文件，并把该文件存放在FileStream中
        System.IO.FileStream Reader = System.IO.File.OpenRead(NewFileName);
        //文件传送的剩余字节数：初始值为文件的总大小
        long Length = Reader.Length;        Response.Buffer = false;
        Response.AddHeader("Connection", "Keep-Alive");
        Response.ContentType = "application/octet-stream";
        Response.AddHeader("Content-Disposition", "attachment; filename=" + Server.UrlEncode("学生成绩.xls"));
        Response.AddHeader("Content-Length", Length.ToString());        byte[] Buffer = new Byte[10000]; //存放欲发送数据的缓冲区
        int ByteToRead; //每次实际读取的字节数        while (Length > 0)
        {
            //剩余字节数不为零，继续传送
            if (Response.IsClientConnected)
            {
                //客户端浏览器还打开着，继续传送
                ByteToRead = Reader.Read(Buffer, 0, 10000); //往缓冲区读入数据
                Response.OutputStream.Write(Buffer, 0, ByteToRead); //把缓冲区的数据写入客户端浏览器
                Response.Flush(); //立即写入客户端
                Length -= ByteToRead; //剩余字节数减少
            }
            else
            {
                //客户端浏览器已经断开，阻止继续循环
                Length = -1;
            }
        }        //关闭该文件
        Reader.Close();
        //删除该Excel文件
        File.Delete(NewFileName);问题就是能够正常的生成excel文件，下载下来后，打开的时候会提示“您尝试打开的文件”学生成绩.xls“的格式与扩展名指定的格式不一样，打开文件前请验证文件没有损坏且来源可信”，然后我就把后缀名改成xlsx试了一下，仍然是这个错误。拜托大家指点下

解决方案 »

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1、打开注册表编辑器
方法：开始 -> 运行 -> 输入regedit -> 确定2、找到注册表子项
HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Excel\Security3、在右侧空白处点击鼠标右键，选择“新建 -> DWORD值(D)”，输入“ExtensionHardening”点击确定。4、用鼠标右键点击ExtensionHardening，然后单击“修改（M）”，在数值数据中填写“0”即可确定。5、关闭注册表编辑器，再次打开xls文件看看是不是提示是不是不见了？小知识：ExtensionHardening设置的值的数据设置：    * 0：不检查文件扩展名和文件类型并绕过该函数的警告消息。
    * 1：检查文件扩展名和文件类型。如果它们不匹配会显示警告消息。
    * 2：检查文件扩展名和文件类型。如果它们不匹配不要打开该文件。试一下行不行
那个提示是不现实了但是出现了这个
丢失文件：E:\..\CSS\CSS.css还是没显示出来内容啊
你的office是什么版本的？是不是简化版的
我提供另外一个思路吧，你可以试试。
项目中建立一个excel文件夹，里面放excel模版，然后通过连接数据库获得需要数据
接着填入excel显示出来我以前都这样写的
你这种方法上传的只是扩展名为xls的html格式的文件，不是真正的xls格式，真正的xls格式微软没有公开，你只能通过Excel.Application去生成真正的xls文件。另外，你还可以生成兼容的xml格式的，完整的例子将 GridView 中的内容导出到 Excel 中多个工作表（Sheet）的方法Excel 可以保存成 xml 格式，并且支持Sheet功能，因此，我们就可以利用这个功能将 Gridview 导出到多个 Sheet  中去。而且可以很好地控制导出的格式。下面就是完整的代码（注意：本站的代码都是可以直接复制、保存成aspx文件运行的。）：
ASPX 代码
<%@ Page Language="C#" EnableViewState="true" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><script runat="server">  protected void Page_Load(object sender, EventArgs e)
  {
    if (!Page.IsPostBack)
    {
      System.Data.DataTable dt = new System.Data.DataTable();
      System.Data.DataRow dr;
      dt.Columns.Add(new System.Data.DataColumn("学生班级", typeof(System.String)));
      dt.Columns.Add(new System.Data.DataColumn("学生姓名", typeof(System.String)));
      dt.Columns.Add(new System.Data.DataColumn("语文", typeof(System.Decimal)));
      dt.Columns.Add(new System.Data.DataColumn("数学", typeof(System.Decimal)));
      dt.Columns.Add(new System.Data.DataColumn("英语", typeof(System.Decimal)));
      dt.Columns.Add(new System.Data.DataColumn("计算机", typeof(System.Decimal)));
      System.Random rd = new System.Random();
      for (int i = 0; i < 88; i++)
      {
        dr = dt.NewRow();
        dr[0] = "班级" + i.ToString();
        dr[1] = "【孟子E章】" + i.ToString();
        dr[2] = System.Math.Round(rd.NextDouble() * 100, 0);
        dr[3] = System.Math.Round(rd.NextDouble() * 100, 0);
        dr[4] = System.Math.Round(rd.NextDouble() * 100, 0);
        dr[5] = System.Math.Round(rd.NextDouble() * 100, 0);
        dt.Rows.Add(dr);
      }
      GridView1.DataSource = dt;
      GridView1.DataBind();
    }
  }  protected void Button1_Click(object sender, EventArgs e)
  {
    //假如每10条数据放在一个 Sheet 里面，先计算需要多少个 Sheet
    int ItenCountPerSheet = 10;
    int SheetCount = Convert.ToInt32(Math.Ceiling((double)GridView1.Rows.Count / ItenCountPerSheet));    String ExportFileName = "孟宪会Excel表格测试";
    if (Request.Browser.Browser.IndexOf("MSIE") > -1)
    {
      ExportFileName = Server.UrlEncode(ExportFileName);
    }
    Response.ClearContent();
    Response.BufferOutput = true;
    Response.Charset = "utf-8";
    Response.ContentType = "text/xml";
    Response.ContentEncoding = System.Text.Encoding.UTF8;
    Response.AppendHeader("Content-Disposition", "attachment;filename=" + ExportFileName + ".xls");
    // 采用下面的格式，将兼容 Excel 2003,Excel 2007, Excel 2010。
    // Response.AppendHeader("Content-Disposition", "attachment;filename="+Server.UrlEncode("孟宪会Excel表格测试")+".xml");
    Response.Write("<?xml version='1.0'?><?mso-application progid='Excel.Sheet'?>");
    Response.Write(@"\r\n<Workbook xmlns='urn:schemas-microsoft-com:office:spreadsheet'
      xmlns:o='urn:schemas-microsoft-com:office:office' xmlns:x='urn:schemas-microsoft-com:office:excel'
      xmlns:ss='urn:schemas-microsoft-com:office:spreadsheet' xmlns:html='http://www.w3.org/TR/REC-html40'>");
    Response.Write(@"\r\n<DocumentProperties xmlns='urn:schemas-microsoft-com:office:office'>");
    Response.Write(@"\r\n<Author>孟宪会</Author><LastAuthor>孟子E章</LastAuthor>
          <Created>2010-09-08T14:07:11Z</Created><Company>mxh</Company><Version>1990</Version>");
    Response.Write("\r\n</DocumentProperties>");
    Response.Write(@"\r\n<Styles><Style ss:ID='Default' ss:Name='Normal'><Alignment ss:Vertical='Center'/>
      <Borders/><Font ss:FontName='宋体' x:CharSet='134' ss:Size='12'/><Interior/><NumberFormat/><Protection/></Style>");
    //定义标题样式
    Response.Write(@"<Style ss:ID='Header'><Borders><Border ss:Position='Bottom' ss:LineStyle='Continuous' ss:Weight='1'/>
       <Border ss:Position='Left' ss:LineStyle='Continuous' ss:Weight='1'/>
       <Border ss:Position='Right' ss:LineStyle='Continuous' ss:Weight='1'/>
       <Border ss:Position='Top' ss:LineStyle='Continuous' ss:Weight='1'/></Borders>
       <Font ss:FontName='宋体' x:CharSet='134' ss:Size='18' ss:Color='#FF0000' ss:Bold='1'/></Style>");

    //定义边框
    Response.Write(@"<Style ss:ID='border'><NumberFormat ss:Format='@'/><Borders>
      <Border ss:Position='Bottom' ss:LineStyle='Continuous' ss:Weight='1'/>
      <Border ss:Position='Left' ss:LineStyle='Continuous' ss:Weight='1'/>
      <Border ss:Position='Right' ss:LineStyle='Continuous' ss:Weight='1'/>
      <Border ss:Position='Top' ss:LineStyle='Continuous' ss:Weight='1'/></Borders></Style>");

    Response.Write("</Styles>");
    for (int i = 0; i < SheetCount; i++)
    {
      //计算该 Sheet 中的数据起始行和结束行。
      int start = ItenCountPerSheet * i;
      int end = ItenCountPerSheet * (i + 1);
      if (end > GridView1.Rows.Count) end = GridView1.Rows.Count;

      Response.Write("\r\n<Worksheet ss:Name='Sheet" + (i+1) + "'>");
      Response.Write("\r\n<Table x:FullColumns='1' x:FullRows='1'>");
      //输出标题      Response.Write("\r\n<Row ss:AutoFitHeight='1'>");
        for (int j = 0; j < GridView1.HeaderRow.Cells.Count; j++)
        {
          Response.Write("<Cell ss:StyleID='Header'><Data ss:Type='String'>" + GridView1.HeaderRow.Cells[j].Text + "</Data></Cell>");
        }
          Response.Write("\r\n</Row>");       for (int j = start; j < end; j++)
        {
          Response.Write("\r\n<Row>");
          for (int c = 0; c < GridView1.HeaderRow.Cells.Count; c++)
          {
            //对于数字，采用Number数字类型
            if (c > 1)
            {
              Response.Write("<Cell ss:StyleID='border'><Data ss:Type='Number'>" + GridView1.Rows[j].Cells[c].Text + "</Data></Cell>");
            }
            else
            {
              Response.Write("<Cell ss:StyleID='border'><Data ss:Type='String'>" + GridView1.Rows[j].Cells[c].Text + "</Data></Cell>");
            }
          }
            Response.Write("\r\n</Row>");
        }
      Response.Write("\r\n</Table>");
      Response.Write("\r\n</Worksheet>");
      Response.Flush();
    }
    Response.Write("\r\n</Workbook>");
    Response.End();
  }</script><html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
  <title></title>
</head>
<body>
  <form id="form1" runat="server">
  <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="导出测试" />
  <asp:GridView ID="GridView1" runat="server">
  </asp:GridView>
  </form>
</body>
</html>
接上另外，请注意：代码里面添加了\r\n换行，是为了生成出来的xml格式有换行，实际可以不用。如果是DataTable，DataSet，可以直接导出成文件。下面是完整的源代码：
C# 代码
<%@ Page Language="C#" %><script runat="server">  protected void Page_Load(object sender, EventArgs e)
  {
    // 下面采用的是DataTable，也可以采用DataSet，其中每个DataTable可以保存成一个 Sheet
    // 迅雷下载时可以在下载完毕后会自动把文件名更新成 xls 或者 xml 的。
    System.Data.DataTable dt = new System.Data.DataTable();
    if (!Page.IsPostBack)
    {
      System.Data.DataRow dr;
      dt.Columns.Add(new System.Data.DataColumn("学生班级", typeof(System.String)));
      dt.Columns.Add(new System.Data.DataColumn("学生姓名", typeof(System.String)));
      dt.Columns.Add(new System.Data.DataColumn("语文", typeof(System.Decimal)));
      dt.Columns.Add(new System.Data.DataColumn("数学", typeof(System.Decimal)));
      dt.Columns.Add(new System.Data.DataColumn("英语", typeof(System.Decimal)));
      dt.Columns.Add(new System.Data.DataColumn("计算机", typeof(System.Decimal)));
      System.Random rd = new System.Random();
      for (int i = 0; i < 88; i++)
      {
        dr = dt.NewRow();
        dr[0] = "班级" + i.ToString();
        dr[1] = "【孟子E章】" + i.ToString();
        dr[2] = System.Math.Round(rd.NextDouble() * 100, 0);
        dr[3] = System.Math.Round(rd.NextDouble() * 100, 0);
        dr[4] = System.Math.Round(rd.NextDouble() * 100, 0);
        dr[5] = System.Math.Round(rd.NextDouble() * 100, 0);
        dt.Rows.Add(dr);
      }
    }    //假如每10条数据放在一个 Sheet 里面，先计算需要多少个 Sheet
    int ItenCountPerSheet = 10;
    int SheetCount = Convert.ToInt32(Math.Ceiling((double)dt.Rows.Count / ItenCountPerSheet));
    Response.ClearContent();
    Response.BufferOutput = true;
    Response.Charset = "utf-8";
    Response.ContentType = "application/ms-excel";
    Response.AddHeader("Content-Transfer-Encoding", "binary");
    Response.ContentEncoding = System.Text.Encoding.UTF8;
    //Response.AppendHeader("Content-Disposition", "attachment;filename="+Server.UrlEncode("孟宪会Excel表格测试")+".xls");
    // 采用下面的格式，将兼容 Excel 2003,Excel 2007, Excel 2010。    String FileName = "孟宪会Excel表格测试";
    if (!String.IsNullOrEmpty(Request.UserAgent))
    {
      // firefox 里面文件名无需编码。
      if (!(Request.UserAgent.IndexOf("Firefox") > -1 && Request.UserAgent.IndexOf("Gecko") > -1))
      {
        FileName = Server.UrlEncode(FileName);
      }
    }
    Response.AppendHeader("Content-Disposition", "attachment;filename=" + FileName + ".xls");
    Response.Write("<?xml version='1.0'?><?mso-application progid='Excel.Sheet'?>");
    Response.Write(@"<Workbook xmlns='urn:schemas-microsoft-com:office:spreadsheet'
      xmlns:o='urn:schemas-microsoft-com:office:office' xmlns:x='urn:schemas-microsoft-com:office:excel'
      xmlns:ss='urn:schemas-microsoft-com:office:spreadsheet' xmlns:html='http://www.w3.org/TR/REC-html40'>");
    Response.Write(@"<DocumentProperties xmlns='urn:schemas-microsoft-com:office:office'>");
    Response.Write(@"<Author>孟宪会</Author><LastAuthor>孟子E章</LastAuthor>
          <Created>2010-09-08T14:07:11Z</Created><Company>mxh</Company><Version>1990</Version>");
    Response.Write("</DocumentProperties>");
    Response.Write(@"<Styles><Style ss:ID='Default' ss:Name='Normal'><Alignment ss:Vertical='Center'/>
      <Borders/><Font ss:FontName='宋体' x:CharSet='134' ss:Size='12'/><Interior/><NumberFormat/><Protection/></Style>");
    //定义标题样式
    Response.Write(@"<Style ss:ID='Header'><Borders><Border ss:Position='Bottom' ss:LineStyle='Continuous' ss:Weight='1'/>
       <Border ss:Position='Left' ss:LineStyle='Continuous' ss:Weight='1'/>
       <Border ss:Position='Right' ss:LineStyle='Continuous' ss:Weight='1'/>
       <Border ss:Position='Top' ss:LineStyle='Continuous' ss:Weight='1'/></Borders>
       <Font ss:FontName='宋体' x:CharSet='134' ss:Size='18' ss:Color='#FF0000' ss:Bold='1'/></Style>");    //定义边框
    Response.Write(@"<Style ss:ID='border'><NumberFormat ss:Format='@'/><Borders>
      <Border ss:Position='Bottom' ss:LineStyle='Continuous' ss:Weight='1'/>
      <Border ss:Position='Left' ss:LineStyle='Continuous' ss:Weight='1'/>
      <Border ss:Position='Right' ss:LineStyle='Continuous' ss:Weight='1'/>
      <Border ss:Position='Top' ss:LineStyle='Continuous' ss:Weight='1'/></Borders></Style>");    Response.Write("</Styles>");    //SheetCount代表生成的 Sheet 数目。
    for (int i = 0; i < SheetCount; i++)
    {
      //计算该 Sheet 中的数据起始行和结束行。
      int start = ItenCountPerSheet * i;
      int end = ItenCountPerSheet * (i + 1);
      if (end > dt.Rows.Count) end = dt.Rows.Count;      Response.Write("<Worksheet ss:Name='Sheet" + (i + 1) + "'>");
      Response.Write("<Table x:FullColumns='1' x:FullRows='1'>");      //输出标题
      Response.Write("\r\n<Row ss:AutoFitHeight='1'>");
      for (int j = 0; j < dt.Columns.Count; j++)
      {
        Response.Write("<Cell ss:StyleID='Header'><Data ss:Type='String'>" + dt.Columns[j].ColumnName + "</Data></Cell>");
      }
      Response.Write("\r\n</Row>");
            for (int j = start; j < end; j++)
      {
        Response.Write("<Row>");
        for (int c = 0; c < 6; c++)
        {
          //对于数字，采用Number数字类型
          if (c > 1)
          {
            Response.Write("<Cell ss:StyleID='border'><Data ss:Type='Number'>" + dt.Rows[j][c].ToString() + "</Data></Cell>");
          }
          else
          {
            Response.Write("<Cell ss:StyleID='border'><Data ss:Type='String'>" + dt.Rows[j][c].ToString() + "</Data></Cell>");
          }
        }
        Response.Write("</Row>");
      }
      Response.Write("</Table>");
      Response.Write("</Worksheet>");
      Response.Flush();
    }
    Response.Write("</Workbook>");
    Response.End();
  }
</script>