使用UpdateProgress的问题

Question

我的ASP.NET页面上有一个按钮,它从我的数据库中获取一些数据并将其显示在gridview上.

这个过程需要一段时间,所以我想我会添加一个updateprogress AJAX控件.现在,当我单击按钮时,updateprogress图像显示并且数据正在从我的数据库中成功获取(我从我在数据库中的一些日志中检查了这一点).但有两个问题:

(1)updateprogress图像仅显示约2分钟.但我的buttonclick事件大约需要5分钟才能完成.基本上,即使在我的任务完成之前,updateprogress也会停止显示,这会使其失败.

(2)GridView没有显示出来.如果我不使用scriptmanager/AJAX,它会正确显示.

有任何想法吗？

一些相关的代码片段:

<div style="position: absolute; top: 300px; left: 19px; width: 568px; height: 48px;">
    <table>
        <tr>
        <td>
    <asp:Button ID="btnGenerateReport" runat="server" Height="37px" Text="Generate Report" 
        Width="132px" onclick="btnGenerateReport_Click" />
        </td>
        <td class="style5">
    <asp:ScriptManager ID="ScriptManager1" runat="server" />
    <asp:UpdatePanel runat="server" id="Panel">
    <ContentTemplate>
            <asp:UpdateProgress ID="PageUpdateProgress" runat="server">
                <ProgressTemplate>
                    <img runat="server" src="updateprogress.gif" 
                        style="position: static; width: 32px;"> </img></ProgressTemplate>
            </asp:UpdateProgress>
            <div style="position: absolute; top: 423px; left: 9px; width: 795px; height: 984px;">
        <asp:GridView ID="Report" runat="server" 
            AllowSorting="True" AutoGenerateColumns="False" 
            Height="622px" BorderStyle="Solid" 
            Width="779px" PageSize="100" HorizontalAlign="Center">
            <Columns>
                <asp:BoundField HeaderText="AccountId" DataField="AccountId">
                <ControlStyle BorderStyle="Solid" Width="20px" />
                </asp:BoundField>
                <asp:BoundField HeaderText="User Name" ReadOnly="True" DataField="UserName">
                <ControlStyle Width="50px" />
                </asp:BoundField>
                <asp:BoundField HeaderText="C2" ReadOnly="True" 
                    DataField="C2">
                <ControlStyle BorderStyle="Solid" Width="20px" />
                </asp:BoundField>
                <asp:BoundField HeaderText="C1" ReadOnly="True" 
                    DataField="C1">
                <ControlStyle BorderStyle="Solid" Width="20px" />
                </asp:BoundField>
            </Columns>
        </asp:GridView>
    </div>
    </ContentTemplate>
    <Triggers>
            <asp:AsyncPostBackTrigger ControlID="btnGenerateReport" EventName="click" />
    </Triggers>
    </asp:UpdatePanel>
        </td>
        <td>
        <asp:Button ID="btnExportToExcel" runat="server" Text="Export To Excel" 
                Height="37px" Width="132px" onclick="btnExportToExcel_Click" />
        </td>
        </tr>
    </table>
    </div>

代码文件部分:

protected void btnGenerateReport_Click(object sender, EventArgs e)
        {

            FetchAccounts();
            long startId = FetchAuditData();
            AggregateAuditData(startId);
            dsAnalysisReport = GenerateDataSet();
            if (dsAnalysisReport == null || dsAnalysisReport.Tables.Count == 0)
                lblErrorText.Text = "No Data Found for the input information";
            else
                BindData(dsAnalysisReport);
        }

        public void FetchAccounts()
        {
            using (var sqlConnection = new SqlConnection(ConnectionString))
            {
                sqlConnection.Open();
                cmdstring = @"[spo_FetchAccounts]";
                cmd = new SqlCommand(cmdstring, sqlConnection) { CommandType = CommandType.StoredProcedure };
                cmd.CommandTimeout = 100000;
                cmd.Parameters.Add("@MaxActivationDate", SqlDbType.DateTime);
                cmd.Parameters["@MaxActivationDate"].Value =
                    DateTime.Parse(txtStartDate.Text) - new TimeSpan(1, 0, 0, 0);
                cmd.ExecuteNonQuery();
                sqlConnection.Close();
            }
        }

        public long FetchAuditData()
        {
            using (var sqlConnection = new SqlConnection(ConnectionString))
            {
                sqlConnection.Open(); 
                cmdstring = @"[spo_GetComparisonData]";
                cmd = new SqlCommand(cmdstring, sqlConnection) { CommandType = CommandType.StoredProcedure };
                cmd.CommandTimeout = 100000;
                cmd.Parameters.Add("@StartDate", SqlDbType.DateTime);
                cmd.Parameters["@StartDate"].Value = txtStartDate.Text;
                cmd.Parameters.Add("@EndDate", SqlDbType.DateTime);
                cmd.Parameters["@EndDate"].Value = txtEndDate.Text;
                SqlParameter returnValue = new SqlParameter("@Return_Value", SqlDbType.BigInt);
                returnValue.Direction = ParameterDirection.ReturnValue;
                cmd.Parameters.Add(returnValue);
                cmd.ExecuteNonQuery();
                long startId = long.Parse(cmd.Parameters["@Return_Value"].Value.ToString());
                sqlConnection.Close();
                return startId;
            }
        }

        private void AggregateAuditData(long startId)
        {
            using (var sqlConnection = new SqlConnection(ConnectionString))
            {
                sqlConnection.Open();
                cmdstring = @"[spo_ComparisonTable]";
                cmd = new SqlCommand(cmdstring, sqlConnection) { CommandType = CommandType.StoredProcedure };
                cmd.CommandTimeout = 100000;
                cmd.Parameters.Add("@StartId", SqlDbType.Int);
                cmd.Parameters["@StartId"].Value = startId;
                cmd.ExecuteNonQuery();
                sqlConnection.Close();
            }
        }


        public DataSet GenerateDataSet()
        {

            using (var sqlConnection = new SqlConnection(ConnectionString))
            {
                sqlConnection.Open();
                cmdstring = @"SELECT * FROM XAccounts";
                cmd = new SqlCommand(cmdstring, sqlConnection);
                DataSet ds = new DataSet();
                SqlDataAdapter da = new SqlDataAdapter(cmd);
                da.Fill(ds);
                sqlConnection.Close();
                if (ds.Tables.Count > 0 && ds.Tables[0].Rows.Count > 0)
                    return ds;
                return null;
            }    
        }

        private void BindData(DataSet ds)
        {
            BindReportGrid(Report, ds.Tables[0]);
        }

        private void BindReportGrid(GridView gridToBind, DataTable dataTableToBind)
        {
            gridToBind.DataSource = dataTableToBind;
            gridToBind.DataBind();
        }

Answer 1

根据问题(1),最有可能是ajax超时.默认超时为90秒.要增加使用ScriptManager的AsyncPostBackTimeout属性:

<asp:ScriptManager ID="ScriptManager1" runat="server" AsyncPostBackTimeout="400">
</asp:ScriptManager>

如果ajax调用超时,页面上的控件可能无法正常工作,因此增加超时可能也会解决问题(2).