GridView RenderControl不工作了吗？

Question

我正在尝试导出到excel一个简单的网格视图，当我试图渲染网格视图控件到一个HtmlTextWriter时，我得到一个空字符串，同时当我对网格视图进行快速查看时，它显示给我显示行。

我正在使用的代码，

protected void btnExportAuto_Click(object sender, EventArgs e)
{
    Response.Clear();
    Response.AddHeader("content-disposition", "attachment;filename=FileName.xls");
    Response.Charset = "";
    Response.ContentType = "application/vnd.xls";
    System.IO.StringWriter stringWrite = new System.IO.StringWriter();
    System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);
    gvNoDataFound.RenderControl(htmlWrite);
    Response.Write(stringWrite.ToString());
    Response.Flush();
    Response.End();
}

public override void VerifyRenderingInServerForm(Control control)
{
    //
}

ASPX：

<asp:GridView ID="gvNoDataFound" runat="server" Visible="False" AutoGenerateColumns="false" Width="100%">
    <Columns>
        <asp:TemplateField HeaderText="ApplicationID" HeaderStyle-Width="150px" ItemStyle-Width="150px">
            <ItemTemplate>
                <asp:Label ID="lblApplicationID2" runat="server" Text='<%# Bind("ApplicationID") %>'></asp:Label>
            </ItemTemplate>
            <HeaderStyle CssClass="gridHeader" />
        </asp:TemplateField>
        <asp:TemplateField HeaderText="ApplicationTransactionID" HeaderStyle-Width="150px" ItemStyle-Width="150px">
            <ItemTemplate>
                <asp:Label ID="lblApplicationTransactionID2" runat="server" Text='<%# Bind("ApplicationTransactionID") %>'></asp:Label>
            </ItemTemplate>
            <HeaderStyle CssClass="gridHeader" />
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Comment" HeaderStyle-Width="150px" ItemStyle-Width="150px">
            <ItemTemplate>
                <asp:Label ID="lblComment2" runat="server" Text='<%# Bind("Comment") %>'></asp:Label>
            </ItemTemplate>
            <HeaderStyle CssClass="gridHeader" />
        </asp:TemplateField>
    </Columns>
</asp:GridView>

我不确定我是不是漏掉了什么，我把所有的东西都放到了runat=“服务器”里，还是不走运。

Answer 1

由于Visible="false"用于GridView，因此RenderControl的输出为空。您可以在呈现内容之前使其可见：

gvNoDataFound.Visible = true;
gvNoDataFound.RenderControl(htmlWrite);
gvNoDataFound.Visible = false;