如何停止Listload从页面加载填充ASPX？

Question

我有一个ASP搜索页面，页面负载调用SearchValves函数，即使没有任何过滤器。这导致基本上所有的记录都会返回，这会使页面加载永远持续下去。无论如何，我可以阻止页面在pageLoad上调用此函数？下面的代码：

<asp:ObjectDataSource ID="ValvesDataSource" runat="server" SelectMethod="SearchValves" 
    TypeName="ApexRemington.BLL.ValveWorkTicketBLL" SortParameterName="sortExpr"> 
    <SelectParameters> 
     <asp:ControlParameter ControlID="CustomerID" Name="customer" PropertyName="Text" Type="String" /> 
     <asp:ControlParameter ControlID="WorkTicket" Name="workTicket" PropertyName="Text" Type="String" /> 
     <asp:ControlParameter ControlID="SalesOrder" Name="salesOrder" PropertyName="Text" Type="String" /> 
     <asp:ControlParameter ControlID="StartAddDate" Name="startAddDate" PropertyName="Text" Type="DateTime" /> 
     <asp:ControlParameter ControlID="EndAddDate" Name="endAddDate" PropertyName="Text" Type="DateTime" /> 
     <asp:ControlParameter ControlID="StartCompletionDate" Name="startCompletionDate" PropertyName="Text" Type="DateTime" /> 
     <asp:ControlParameter ControlID="EndCompletionDate" Name="endCompletionDate" PropertyName="Text" Type="DateTime" /> 
     <asp:ControlParameter ControlID="Area" Name="area" PropertyName="Text" Type="String" /> 
     <asp:ControlParameter ControlID="LocationDescription" Name="locationDescription" PropertyName="Text" Type="String" /> 
     <asp:ControlParameter ControlID="EquipmentProtected" Name="equipmentProtected" PropertyName="Text" Type="String" /> 
     <asp:ControlParameter ControlID="ValveSerial" Name="valveSerial" PropertyName="Text" Type="String" /> 
     <asp:ControlParameter ControlID="ValveNumber" Name="valveNumber" PropertyName="Text" Type="String" /> 
     <asp:ControlParameter ControlID="BasketNumber" Name="basketNumber" PropertyName="Text" Type="String" /> 
     <asp:ControlParameter ControlID="Manufacturer" Name="manufacturer" PropertyName="Text" Type="String" /> 
     <asp:ControlParameter ControlID="ValveModel" Name="valveModel" PropertyName="Text" Type="String" /> 
     <asp:ControlParameter ControlID="TypeList" Name="valveType" PropertyName="SelectedValue" Type="Object" /> 
     <asp:ControlParameter ControlID="ValveSize" Name="valveSize" PropertyName="Text" Type="String" /> 
     <asp:ControlParameter ControlID="ValveRating" Name="valveRating" PropertyName="Text" Type="String" /> 
     <asp:ControlParameter ControlID="SetPressure" Name="setPressure" PropertyName="Text" Type="String" /> 
    </SelectParameters> 
</asp:ObjectDataSource> 

的“SearchValves”功能：

public static IEnumerable<Valve> SearchValves(
     string customer, 
     string workTicket, 
     string salesOrder, 
     string area, 
     string locationDescription, 
     string equipmentProtected, 
     DateTime? startAddDate, 
     DateTime? endAddDate, 
     DateTime? startCompletionDate, 
     DateTime? endCompletionDate, 
     string valveSerial, 
     string valveNumber, 
     string basketNumber, 
     string manufacturer, 
     string valveModel, 
     ValveType? valveType, 
     string valveSize, 
     string valveRating, 
     string setPressure, 
     string sortExpr) 
    { 
     using (MiniProfiler.Current.Step("SearchValves")) 
     using (var context = rempscoDataContext.CreateContext()) 
     { 
      IQueryable<valve_history> data = context.valve_histories; 

      var flag = false; 


      bool valve_flag; 
      var valve_filter = _BuildValveFilter(
       customer, 
       valveSerial, 
       valveNumber, 
       basketNumber, 
       manufacturer, 
       valveModel, 
       valveType, 
       valveSize, 
       valveRating, 
       setPressure, 
       out valve_flag); 

      data = data.Where(valve_filter); 
      if (valve_flag) 
       flag = true; 

      bool ticket_flag; 
      bool only_store_flag; 
      var ticket_filter = _BuildWorkTicketFilter(
       customer, 
       workTicket, 
       null, 
       salesOrder, 
       startAddDate, 
       endAddDate, 
       startCompletionDate, 
       endCompletionDate, 
       area, 
       locationDescription, 
       equipmentProtected, 
       string.Empty, 
       string.Empty, 
       string.Empty, 
       out ticket_flag, 
       out only_store_flag); 

      if (ticket_flag) 
      { 
       data = data.WhereAny(v => v.valve_work_tickets, ticket_filter); 
       flag = true; 
      } 

      if (!flag) 
      { 
       data = data.Where(v => 
        v.valve_work_tickets.Any(wt => Security.CurrentStores.Contains(wt.store.s_store_id)) && 
        v.valve_work_tickets.Any(wt => wt.status == (char)ValveWorkTicketStatus.Invoiced)); 
      } 

      var retData = (
       from vh in data 
       group vh by vh.valve_id into vhgroups 
       let vhid = vhgroups.Max(x => x.history_id) 
       from vh in vhgroups 
       where vh.history_id == vhid 
       let v = vh.valve 
       select new Valve() 
       { 
        ValveID = v.valve_id, 
        Type = (ValveType)v.valve_type, 
        Manufacturer = v.manufacturer, 
        InternalValveNumber = v.internal_valve_number, 
        InternalBasketNumber = v.internal_basket_number, 
        SerialNumber = v.serial_number, 
        ModelNumber = v.model_number, 
        Size = v.size, 
        Temperature = v.temperature, 
        ConnectionType = v.connection_type, 
        LastServiceDate = v.last_service_date, 
        CustomerID = v.customer_id, 
        Comments = v.comments, 

        AddTime = v.add_time, 
        AddUser = v.add_user, 
        EditTime = v.edit_time, 
        EditUser = v.edit_user, 

        //PSV Specific Fields 
        TopType = v.top_type, 
        SetPressureType = v.set_pressure_type, 
        SetPressure = v.set_pressure, 
        Capacity = v.capactity, 
        InFlangeSize = v.in_flange_size, 
        OutFlangeSize = v.out_flange_size, 
        BackPressureType = v.back_pressure_type, 
        BackPressure = v.back_pressure, 
        CodeSymbol = v.code_symbol, 
        ColdSetPressureType = v.cold_set_pressure_type, 
        ColdSetPressure = v.cold_set_pressure, 
        CRNNumber = v.crn_number, 

        //API Specific Fields 
        Rating = v.rating, 
        BodyMaterial = v.body_material, 
        TrimMaterial = v.trim_material, 
        PartNumber = v.part_number, 
        APIValveType = v.api_valve_type, 

        WorkTickets = (from wt in v.valve_work_tickets 
            select new ValveWorkTicket() 
            { 
             WorkTicketID = wt.work_ticket_id, 
             Status = (ValveWorkTicketStatus)wt.status, 

             FullWorkTicket = wt.store.s_store_id + '-' + wt.ticket_number, 

             AddTime = wt.add_time, 

             Customer = new Customer() 
             { 
              CustomerNumber = wt.customer.c_cust_id, 
              Name = wt.customer.c_name, 
             }, 
             SalesOrder = wt.order_id.HasValue ? new SalesOrder() 
             { 
              OrderID = wt.sales_order.order_id, 
              FullOrder = wt.sales_order.store.s_store_id + '-' + wt.sales_order.order + '-' + wt.sales_order.order_ext, 
             } : new SalesOrder() { FullOrder = string.Empty, OrderID = 0 }, 
            }).ToList(), 

        Customer = new Customer() 
        { 
         Name = v.customer.c_name, 
         CustomerNumber = v.customer.c_cust_id, 
        }, 
       }); 

      retData = string.IsNullOrEmpty(sortExpr) ? 
       retData.OrderBy(v => v.SerialNumber) : 
       retData.OrderBy(sortExpr); 

      return retData.ToList(); 
     } 
    } 

目前阀门标志将返回false，防止如果搜索参数为空返回数据。有没有实际调用页面加载功能的另一种方法？

Answer 1

很难说如果没有看到你的ListViewaspx代码，但不必在ListView本身附加数据源，你可以在代码后面做。如果您在aspx页面上使用它，它将始终被绑定。

我觉得你有这样的事情：

<asp:ListView ID="ListView1" runat="server" DataSource="ValvesDataSource"></asp:ListView> 

改变，要

<asp:ListView ID="ListView1" runat="server"></asp:ListView> 

代码背后

//only bind data after a specific action 
protected void Button1_Click(object sender, EventArgs e) 
{ 
    ListView1.DataSource = ValvesDataSource; 
    ListView1.DataBind(); 
}