C# 将gridview导出到Excel仅保存列b第1行

我在几个web应用程序上使用相同的代码将gridview数据导出到excel。通常工作正常，但在这种情况下，当我打开生成的excel文件时，只填充了一个单元格。这是我的出口代码：

protected void export_btn_Click(object sender, ImageClickEventArgs e)
{
    ExportGridToExcel();
}
private void ExportGridToExcel()  
{  
    Response.Clear();  
    Response.Buffer = true;  
    Response.ClearContent();  
    Response.ClearHeaders();  
    Response.Charset = "";  
    string FileName ="SomeFileName" + DateTime.Now + ".xls";  
    StringWriter strwritter = new StringWriter();  
    HtmlTextWriter htmltextwrtter = new HtmlTextWriter(strwritter);        
    Response.Cache.SetCacheability(HttpCacheability.NoCache);  
    Response.ContentType ="application/vnd.ms-excel";    
    Response.AddHeader("Content-Disposition","attachment;filename=" + FileName);
    allDataGridView.GridLines = GridLines.Both;
    allDataGridView.HeaderStyle.Font.Bold = true;
    allDataGridView.RenderControl(htmltextwrtter);  
    Response.Write(strwritter.ToString());  
    Response.End();      
}  
public override void VerifyRenderingInServerForm(Control control)
{
    /* Confirms that an HtmlForm control is rendered for the specified ASP.NET
        server control at run time. */
}

gridview中的数据包含html格式（如果有区别的话）。关于导出到excel有很多问题，但对于这个特定问题没有问题

编辑：Gridview代码：

<asp:GridView ID="allDataGridView" runat="server" AutoGenerateColumns="False" 
    CellPadding="4" DataKeyNames="ID" DataSourceID="allDataDataSource" 
    ForeColor="#333333" Width="795px" Font-Size="X-Small">
    <AlternatingRowStyle BackColor="White" ForeColor="#284775" />
    <Columns>
        <asp:BoundField DataField="CODE" HeaderText="Code" HtmlEncode="False" 
            SortExpression="CODE">
        <HeaderStyle HorizontalAlign="Left" VerticalAlign="Middle" />
        <ItemStyle HorizontalAlign="Left" VerticalAlign="Top" />
        </asp:BoundField>
        <asp:BoundField DataField="DESCRIPTION" HeaderText="Description" 
            HtmlEncode="False" SortExpression="DESCRIPTION">
        <HeaderStyle HorizontalAlign="Left" VerticalAlign="Middle" />
        <ItemStyle HorizontalAlign="Left" VerticalAlign="Top" />
        </asp:BoundField>
        <asp:BoundField DataField="TAT" HeaderText="TAT" HtmlEncode="False" 
            SortExpression="TAT">
        <HeaderStyle HorizontalAlign="Left" VerticalAlign="Middle" />
        <ItemStyle HorizontalAlign="Left" VerticalAlign="Top" />
        </asp:BoundField>
        <asp:BoundField DataField="CONTACT" HeaderText="Contact" HtmlEncode="False" 
            SortExpression="CONTACT">
        <HeaderStyle HorizontalAlign="Left" VerticalAlign="Middle" />
        <ItemStyle HorizontalAlign="Left" VerticalAlign="Top" />
        </asp:BoundField>
    </Columns>
    <EditRowStyle BackColor="#999999" />
    <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
    <HeaderStyle BackColor="#005293" Font-Bold="True" ForeColor="White" />
    <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
    <RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
    <SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
    <SortedAscendingCellStyle BackColor="#E9E7E2" />
    <SortedAscendingHeaderStyle BackColor="#506C8C" />
    <SortedDescendingCellStyle BackColor="#FFFDF8" />
    <SortedDescendingHeaderStyle BackColor="#6F8DAE" />
</asp:GridView>

更新： gridview中的HTML内容似乎确实是个问题。当我将HTML Encode设置为False时，gridview将正确导出，尽管带有HTML标记。在将gridview数据分配给HtmlTextWrter之后，有没有关于如何对其重新编码的想法？

请使用此代码

Response.ClearContent();
Response.ClearHeaders();

Response.AddHeader("content-disposition", "attachment;filename=Demo.xls");
Response.ContentType = "application/ms-excel";
Response.ContentEncoding = System.Text.Encoding.Unicode;
Response.BinaryWrite(System.Text.Encoding.Unicode.GetPreamble());

System.IO.StringWriter sw = new System.IO.StringWriter();
System.Web.UI.HtmlTextWriter hw = new HtmlTextWriter(sw);

Label lblheader = new Label();
lblheader.Font.Size = new FontUnit(14, UnitType.Point);
lblheader.Font.Bold = true;
lblheader.Text = "Demo Details";
lblheader.RenderControl(hw);



GrdExcel.Visible = true;
GrdExcel.RenderControl(hw);

Response.Write(sw.ToString());
Response.Flush();
Response.End();
GrdExcel.Visible = false;

使用UpdatePanel和触发器

---

问题是gridview中的HTML代码。它包含和标记，一旦这些被删除，它将很好地导出。

您能发布gridview的标记吗？我已经编辑了您的标题。请看，如果共识是否定的，他们就不应该这样做。同样的结果被返回

 <Triggers>
       <asp:PostBackTrigger ControlID="BtnExcel" />
 </Triggers>