asp:UpdateProgress 在点击转发器内的可下载内容后永远不会消失

Question

我有一个 ASP.NET 3.5 页面，其中有一个中继器，其中包含信息行和用于更改其状态的自定义按钮。

假设是这样

btn1 btn2 btn3 Id Title Description Status1 Status2

btn1 和 btn2 分别用来改变 status1 和 2。

btn3 重定向到自定义处理程序，该处理程序发回可下载的 MS-Word 报告。这发生在没有实际离开页面的情况下。

转发器位于 updatePanel 内部，因此我可以更新状态，而不必每次都重新加载整个页面。

当我单击 btn1 或 2 时，加载微调器会像往常一样出现，并在进程完成且状态更改时淡出。

当我单击 btn3 时，加载旋转器会停留在那里，永远不会消失，即使在我完成下载后也是如此。

可能发生什么情况？

处理程序代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Net;
using System.IO;
using PublishVersionControlCore;
using System.Configuration;

namespace PublishVersionControlWebControl.Handler
{
    public class WordFileHandler : IHttpAsyncHandler
    {
        private HttpContext _context;
        private AsyncTaskDelegate del;
        protected delegate void AsyncTaskDelegate(HttpContext context);

        #region IHttpAsyncHandler Members

        public WordFileHandler()
        {
            this.del = new AsyncTaskDelegate(ProcessRequest);
        }

        public IAsyncResult BeginProcessRequest(HttpContext context, AsyncCallback cb, object extraData)
        {
            // Store context
            _context = context;
            return del.BeginInvoke(context, cb, extraData);
        }

        public void EndProcessRequest(IAsyncResult result)
        {
            this.del.EndInvoke(result);
        }

        #endregion

        #region IHttpHandler Members

        public bool IsReusable
        {
            get { return true; }
        }

        public void ProcessRequest(HttpContext context)
        {
            HttpResponse resp = context.Response;
            resp.Clear();
            int workItemId = 0;
            if (Int32.TryParse(context.Request.QueryString["wi"], out workItemId))
            {
                MemoryStream ms = null;
                using (WorkItemReportService.ReportClient client = new WorkItemReportService.ReportClient())
                {
                    byte[] resultFile = client.GenerateWorkReport(
                        new Uri(ConfigurationManager.AppSettings["serverUri"]),
                        workItemId,
                        ConfigurationManager.AppSettings["wordTemplate"]);
                    ms = new MemoryStream(resultFile);
                }

                resp.ContentType = "application/octet-stream";
                resp.AddHeader("content-disposition", String.Format("attachment;filename=RelatorioSimples_WI-{0}.docx", workItemId));
                resp.Buffer = true;                
                ms.WriteTo(resp.OutputStream);
                resp.End();
            }
        }

        #endregion
    }
}

中继器中的 ItemCommand：

if (e.CommandName.Equals("WordExport"))
{
    string uri = HttpContext.Current.Request.RawUrl;
    string url = string.Format("{0}/WordReport.dohx?wi={1}",
    uri.Substring(0, uri.LastIndexOf("/")), wivdata.SystemID);
    Response.Redirect(url);
}

Aspx 页面（我将其全部粘贴，因为我不知道什么是相关的，什么是不相关的）：

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="~/ListaDeAtividadesPage.aspx.cs"
    MasterPageFile="~/_layouts/customapplication.master" Inherits="PublishVersionControlWebControl.ListaDeAtividadesPage, PublishVersionControlWebControl, Version=1.0.0.0, Culture=neutral, PublicKeyToken=78508f22b73cda2b" %>

<%@ Register Assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
    Namespace="System.Web.UI" TagPrefix="asp" %>
<asp:Content ContentPlaceHolderID="PlaceHolderAdditionalPageHead" runat="server">
    <link rel='stylesheet' text='text/css' href='/_layouts/Extensions/Versioning/css/style.css' />
    <script src="/_layouts/Extensions/Versioning/js/jquery.tools.min.js" type="text/javascript"></script>
    <script src="/_layouts/Extensions/Versioning/js/jquery.corner.js" type="text/javascript"></script>
</asp:Content>
<asp:Content ID="Content1" ContentPlaceHolderID="PlaceHolderPageImage" runat="server">
    <img width="145" height="54" alt="Dashboard" src="/_layouts/Microsoft.TeamFoundation/images/notes.png" />
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="PlaceHolderPageTitleInTitleArea"
    runat="server">
    <asp:Literal ID="TitleContent" runat="server"></asp:Literal>
</asp:Content>
<asp:Content ID="Main" ContentPlaceHolderID="PlaceHolderMain" runat="server">
    <script type="text/javascript">
        _spOriginalFormAction = document.forms[0].action;
        _spSuppressFormOnSubmitWrapper = true;  
    </script>
    <asp:UpdateProgress ID="UpdateProgress1" runat="server" AssociatedUpdatePanelID="updPanel">
        <ProgressTemplate >
            <div class="follower">
            <asp:Image ID="imgUpdate" CssClass="follower" ImageUrl="/_layouts/Extensions/Versioning/img/ui/ajax-loader.gif"
                runat="server" />
                <span class="follower">Carregando...</span>
            </div>
        </ProgressTemplate>
    </asp:UpdateProgress>
    <div>
        <asp:UpdatePanel ID="updPanel" runat="server">
            <ContentTemplate>
                <asp:Literal ID="tooltipScript" runat="server" />
                <div class="buttonBar">
                    <hr style="color: #426DA8;" />
                    <asp:Button CssClass="specific" ID="btnUpdateWI" Text="Atualiza WIs da Lista" runat="server"
                        UseSubmitBehavior="false" />
                    <asp:Button CssClass="specific" ID="btnRelatorioScripts" Text="Relatório de Scripts / ZIPs"
                        runat="server" />
                    <asp:Button CssClass="specific" ID="Button1" Text="Relatório de Publicações" runat="server" />
                    <asp:Button CssClass="generic" ID="btnVolta" Text="Volta ao Menu de Versões" runat="server" />
                    <hr style="color: #426DA8;" />
                </div>
                <asp:Repeater ID="rptListaAtividades" runat="server">
                    <HeaderTemplate>
                        <asp:Label ID="comentarioHeader" runat="server"/>
                        <h3>
                            <b class="rollback">Rollback</b> | <b class="emteste">Em Teste</b> | <b class="aindanaoincluido">
                                Ainda não Incluído</b> | <b class="parcialmenteok">Atividade Parcialmente OK</b>
                            | <b class="todosok">Atividade OK em Todas as Lojas</b> | <b class="parcpublicado">Parcialmente Publicada</b> | <b class="publicado">Atividade
                                Publicada</b>
                        </h3>   
                    </HeaderTemplate>
                    <ItemTemplate>
                        <div class="item" style="display: inline-block; font-size: 12px">
                            <asp:ImageButton ToolTip="Gerar Relatório Word" ImageUrl="/_layouts/Extensions/Versioning/img/wordexport.png"
                                CommandName="WordExport" ID="btnWordExport" CssClass="itembutton" runat="server" />
                            <asp:ImageButton ToolTip="Marcar como Rollback" ImageUrl="/_layouts/Extensions/Versioning/img/rollback.png"
                                CommandName="MarkAsRollback" ID="btnItemRollback" CssClass="itembutton" runat="server" />
                            <asp:ImageButton ToolTip="Esta atividade possui código. Clique para sinalizar como apenas procedure/config"
                                ImageUrl="/_layouts/Extensions/Versioning/img/code.png" CommandName="MarkAsProc"
                                ID="btnItemProc" CssClass="itembutton" runat="server" />
                            <asp:Image ToolTip="Esta atividade não possui scripts de banco/zips." ImageUrl="/_layouts/Extensions/Versioning/img/noscript.png"
                                runat="server" CssClass="itembutton" ID="btnItemScript" />
                            <asp:Label ID="labelWI" Text="" runat="server"></asp:Label>
                            <asp:Literal ID="tooltip" runat="server" />
                            <asp:Label ID="labelState" Text="" runat="server"></asp:Label>
                            <span style="color: #4A82CB">
                                <%# DataBinder.Eval(Container.DataItem, "SystemAssignedTo") %>
                                - </span><span style="color: Navy">
                                    <%# DataBinder.Eval(Container.DataItem, "SystemTitle") %>
                                </span>
                            <asp:HiddenField ID="workItemID" runat="server" />
                        </div>
                        <hr class="item" noshade style="color: #4CBDCB; height: 2px; background-color: #4CBDCB" />
                    </ItemTemplate>
                </asp:Repeater>
            </ContentTemplate>
        </asp:UpdatePanel>
    </div>
</asp:Content>

其他详细信息：

• 这是 WSS 3.0 中的布局页面
• 我不确定更新面板是它应该在的地方

Answer 1

您无法从 updatepanel 内部的调用中调用 Response.Redirect(url) 。

通过此重定向，您会破坏视图状态，并且永远不会返回 updatepanel 询问的信息。为您的下载链接找到其他方法，或删除 updatepanel。

了解 ajax 和 UpdatePanel 的工作原理。你发送一个ajax请求，UpdatePanel等待应答数据，而你从来没有发送给他，所以指示器仍然永远等待。但是，在您发表帖子后，您会破坏视图状态，并且在您的第二篇帖子中，您将出现 javascript 错误。

一些可能的解决方案是在回发后渲染 JavaScript 以进行重定向，但使用 JavaScript 函数调用。