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我刚开始学习如何使用 Ajax，我被困在这上面。

我的 ASP.net 网站上的按钮运行良好，但在添加 Ajax 面板后，导出到 Excel 和导出到 CSV 停止工作。

他们在我添加面板之前工作，当我调试To_Excel_Click调用的函数时，它会被处理，但它只是不创建 Excel 文件。我认为 Ajax 中的某些内容正在阻止创建文件。

感谢您的任何帮助

HTML Ajax

<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
    <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
    <contenttemplate>
<asp:Button ID="BT1" runat="server" Text="Submit" Visible="false" onclick="BT1"/>
 <asp:Button ID="BT2" runat="server" Text="Submit" Visible="false" onclick="BT2" />
 <asp:Button ID="BTMakeCVS" runat="server" Text="Submit to CVS" Visible="false" onclick="BTMakeCVS_Click" />
    <asp:Button ID="To_Excel" runat="server" Text="To Excel" onclick="To_Excel_Click" Visible="false" AutoPostBack="True"/>
    </fieldset><fieldset class="Matainancefieldset3">
<asp:GridView ID="GVData" runat="server" Visible="false">
         <RowStyle CssClass="Row" />
    <AlternatingRowStyle CssClass="AltRow" /> 
    <PagerTemplate><table><tr><td>
        <asp:PlaceHolder ID="ph" runat="server">
        </asp:PlaceHolder></td></tr></table>
    </PagerTemplate>
    </asp:GridView>
 <asp:Label ID="LBExcell" runat="server" Text="Model:" Visible="false"></asp:Label>
 </contenttemplate>
        </asp:UpdatePanel>
</asp:Content>

C＃

protected void To_Excel_Click(object sender, EventArgs e)
{
        ExcelExport.Export("Summary.xls", GVData);
}

public class ExcelExport
{
    public static void Export(string fileName, GridView gv)
    {
        HttpContext.Current.Response.Clear();
        HttpContext.Current.Response.AddHeader(
              "content-disposition", string.Format("attachment;filename={0}", fileName));
        HttpContext.Current.Response.ContentType = "application/ms-excel";

        using (StringWriter sw = new StringWriter())
        {
            using (HtmlTextWriter htw = new HtmlTextWriter(sw))
            {
                Table table = new Table();
                table.GridLines = gv.GridLines;

                if (gv.HeaderRow != null)
                {
                    ExcelExport.PrepareControlForExport(gv.HeaderRow);
                    table.Rows.Add(gv.HeaderRow);
                }

                foreach (GridViewRow row in gv.Rows)
                {
                    ExcelExport.PrepareControlForExport(row);
                    table.Rows.Add(row);
                }

                if (gv.FooterRow != null)
                {
                    ExcelExport.PrepareControlForExport(gv.FooterRow);
                    table.Rows.Add(gv.FooterRow);
                }

                table.RenderControl(htw);

                HttpContext.Current.Response.Write(sw.ToString());
                HttpContext.Current.Response.End();
            }
        }
    }

    private static void PrepareControlForExport(Control control)
    {
        for (int i = 0; i < control.Controls.Count; i++)
        {
            Control current = control.Controls[i];

            if (current is LinkButton)
            {
                control.Controls.Remove(current);
                control.Controls.AddAt(i, new LiteralControl((current
as LinkButton).Text));
            }
            else if (current is ImageButton)
            {
                control.Controls.Remove(current);
                control.Controls.AddAt(i, new LiteralControl((current
as ImageButton).AlternateText));
            }
            else if (current is HyperLink)
            {
                control.Controls.Remove(current);
                control.Controls.AddAt(i, new LiteralControl((current
as HyperLink).Text));
            }
            else if (current is DropDownList)
            {
                control.Controls.Remove(current);
                control.Controls.AddAt(i, new LiteralControl((current
as DropDownList).SelectedItem.Text));
            }
            else if (current is CheckBox)
            {
                control.Controls.Remove(current);
                control.Controls.AddAt(i, new LiteralControl((current
as CheckBox).Checked ? "True" : "False"));
            }

            if (current.HasControls())
            {
                ExcelExport.PrepareControlForExport(current);
            }
        }
    }
}
4

1 回答 1

1

你不能Response用PartialPostBack那UpdatePanel火来做所有这些工作。如果您只是将已经渲染的GridVieww/ 数据渲染为 HTML，以便可以将其保存为 Excel，那么通过将其包装在UpdatePanel.

我将“导出到 Excel”按钮放在 之外UpdatePanel，这应该可以避免任何问题。

于 2013-09-19T16:25:00.740 回答