c# - 在 Page_load 方法中只传递一次

Question

在 Page_Load 中，我调用了一个只列出一些来 self 的数据库的数据的方法。但是，如果我浏览我的网站，然后返回到仅列出一些数据的同一个链接，该方法不会通过 Page_Load，然后显示旧数据值。

为什么我的 Page_Load 只被调用一次？

我的页面加载

protected void Page_Load(object sender, EventArgs e)
{            
    this.CarregaList();
}

我的 CarregaList 方法

protected void CarregaList()
{
    Utilidade.Conexao con = new Utilidade.Conexao();
    dsChave.ConnectionString = con.Con;

    #region :::: Montando o Select da lista ::::

    //// Parametros do Usuário,podem ser pegos pelo token
    Utilidade.QuebraToken tk = new Utilidade.QuebraToken();

    int Acesso = Convert.ToInt32(tk.CarregaToken(15, Request.Cookies["token"].Value));
    int IdUsuario = Convert.ToInt32(tk.CarregaToken(0, Request.Cookies["token"].Value));
    int Celula = Convert.ToInt32(tk.CarregaToken(21, Request.Cookies["token"].Value));
    int Credenciada = Convert.ToInt32(tk.CarregaToken(1, Request.Cookies["token"].Value));

    StringBuilder sbSelect = new StringBuilder();

    string selectx = "SELECT top 10 San_Chave.Chave_Id, San_Chave.Usuario_Id, San_Chave.Credenciada_Id, San_Chave.Usuario_Id_Responsavel, San_Chave.DataHora, San_Chave.Transacao, " 
        + "San_Chave.Cliente_Id, San_Chave.DataHoraPegou, San_Chave.DataHoraDevolverPrevisao, San_Chave.DataHoraEntregou, San_Chave.HorasDevolucao, " 
        + "San_Chave.NomeResponsavel, San_Chave.CpfResponsavel, San_Chave.RgResponsavel, San_Chave.TelResponsavel, San_Chave.Tel2Responsavel, " 
        + "San_Chave.Endereco, San_Chave.Devolvido, San_Chave.TextoDevolucao, San_Usuario.NomeCompleto AS NomeUsuarioVenda, view_Cliente.NomeCliente " 
        + "FROM San_Chave " 
        + "JOIN San_Usuario " 
        + "ON San_Chave.Usuario_Id_Responsavel = San_Usuario.Usuario_Id "
        + "LEFT OUTER JOIN view_Cliente " 
        + "ON San_Chave.Cliente_Id = view_Cliente.Cliente_Id " 
        + "where (San_Chave.Devolvido = 0 or San_Chave.Devolvido is NULL) ";

    sbSelect.Insert(0, selectx);

    if (Acesso == 0)
    {
        sbSelect.Append(" and San_Chave.Credenciada_Id = " + Credenciada);
    }

    if (Request.QueryString["data"] != null)
    {
        sbSelect.Append(" and ( San_Usuario.NomeCompleto like '%" + Request.QueryString["data"].ToString() + "%' or San_Chave.DataHoraPegou like '%" + Request.QueryString["data"].ToString() + "%' or San_Chave.NomeResponsavel like '%" + Request.QueryString["data"].ToString() + "%' or view_Cliente.NomeCliente like '%" + Request.QueryString["data"].ToString() + "%' )");
    }

    if (Request.QueryString["transacao"] != null)
    {
        sbSelect.Append(" and San_Chave.Transacao = " + Convert.ToInt32(Request.QueryString["transacao"]));
    }

    #endregion

    dsChave.SelectCommand = sbSelect.ToString();
}

我的标记

<%@ Page Title="" Language="C#" MasterPageFile="~/San/masterPage/San.Master" AutoEventWireup="true" CodeBehind="ListaChaves.aspx.cs" Inherits="Ui.San.Chaves.ListaChaves" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">            

</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="contentConteudo" runat="server">

<div class="divLightBox" title="Devolução de Chave" id="DevolucaoBox"></div>

<%--Aqui vem o Topo de Informaçoes da Lista--%>
<div id="InfoLista">
    <div id="InfoListaDados">
        <div id="InfoListaTabela">
            <table width="640" border="0" cellspacing="0" cellpadding="0" 
                style="margin-right: 0px">
              <tr>
                <td width="189" align="left" style="width: 440px">
                    <table border="0" cellspacing="0" cellpadding="0">
                      <tr>
                        <td >
                            <input id="InputBusca" type="text" value="Procurar Chaves: Nome responsável ou data" /></td>
                        <td width="75"><img src="../tema/_Internas/imgs/btnBusca.jpg" id="btnBuscar" style="cursor:pointer;"/></td>
                      </tr>
                    </table>
                </td>
                <td width="40" align="right">
                    <table border="0" cellspacing="0" cellpadding="3" style="width: 69px">
                      <tr align="center">
                        <td>
                            <img alt="" class="style4" src="../tema/_Internas/icons/date.png" /></td>
                      </tr>
                      <tr class="FonteLegenda">
                        <td align="center">Marcar Entrega</td>
                      </tr>
                    </table>
                </td>
              </tr>    
              <tr>
                <td width="189" colspan="2" align="left" style="width: 440px">
                    <table border="0" cellspacing="0" cellpadding="0">
                      <tr>
                        <td>
                                                Transação: 
                                                    <select id="transacao">
                                                        <option value="0">Venda/Aluguel</option>
                                                        <option value="1">Venda</option>
                                                        <option value="2">Aluguel</option>
                                                    </select>
                                                </td>
                      </tr>
                    </table>
                </td>
              </tr>
            </table>
        </div>
    </div>
</div>
<div>

    <p><strong>Exibindo resultado por</strong></p>
    <p><strong>Responsável ou data</strong>: <%= buscaData(Request.QueryString["data"])%> </p>
    <p><strong>Tipo de Transação</strong>: <%=  buscaTransacao(Request.QueryString["transacao"])%></p>
</div>


<asp:ListView ID="lv_chave" runat="server" DataSourceID="dsChave" 
                        EnableModelValidation="True" DataKeyNames="Chave_Id" >
                        <EmptyDataTemplate>
                            <table id="Table1" runat="server" border="0" cellspacing="0" cellpadding="0">
                                <tr>
                                    <td>
                                        nada encontrado
                                    </td>
                                </tr>
                            </table>
                        </EmptyDataTemplate>
            <GroupTemplate>
                <tr ID="itemPlaceholderContainer" runat="server">
                    <td ID="itemPlaceholder" runat="server">
                    </td>
                </tr>
            </GroupTemplate>
                        <ItemTemplate>


<table width="680" border="0" cellspacing="0" cellpadding="0" id='boxCliente_<%# Eval("Chave_Id") %>'>
  <tr>
    <td>
    <div class="BoxDeDados <%# Eval("Chave_Id") %>">
        <div id="transacao_Id" style="display:none;"><%# Eval("Transacao")%></div>
        <div id="imovel_Id" style="display:none;"> <%# carregaImovel_Id(Eval("Chave_Id").ToString())%></div>
        <div id="cliente_Id" style="display:none;"> <%# Eval("Cliente_Id")%>  </div>

                <div class="BoxBarraTitulo">&nbsp;&nbsp;Expira em <%# Eval("HorasDevolucao")%> Hs&nbsp;&nbsp;&nbsp;Transação:</b> <%# transacao(Eval("Transacao").ToString()) %></div>
        <table width="676" border="0" cellspacing="0" cellpadding="0" class="TxtInter2">
          <tr>
            <td width="225" height="36" bgcolor="#F4F0EF" >
                &nbsp;<b>Data de retirada:</b><br />
                &nbsp;<%# Dt(Eval("DataHoraPegou").ToString(),"dddd dd/MM/yyyy") %>- <b><%# Dt(Eval("DataHoraPegou").ToString(),"HH:mm") %></b>
            </td>
            <td width="393" bgcolor="#F4F0EF">
                &nbsp;<b>Previsão de devolução:</b><br />
                &nbsp;<%# Dt(Eval("DataHoraDevolverPrevisao").ToString(), "dddd dd/MM/yyyy")%>- <b><%# Dt(Eval("DataHoraDevolverPrevisao").ToString(), "HH:mm")%></b>
            </td>
            <td width="58" bgcolor="#F4F0EF" align="center"><b>Editar<br>Status:</b></td>
          </tr>
          <tr>
            <td height="27">
                &nbsp;<span class="TxtInter3"><b>Responsável: </b><%# Responsavel(Eval("Transacao").ToString(), Eval("NomeResponsavel").ToString(), Eval("NomeUsuarioVenda").ToString())%></span>
            </td>
            <td  align="center">
                <%# carregaChaves(Eval("Chave_Id").ToString())%>
            </td>
            <td align="center" valign="top"><%# Icon(Eval("Chave_Id").ToString())%></td>
          </tr>
        </table>
    </div>
    </td>
  </tr>
</table>
                        </ItemTemplate>
                        <LayoutTemplate>

                            <table ID="groupPlaceholderContainer" runat="server" border="0" style="">
                                <tr id="Tr1" runat="server" style="">
                                    <th id="Th1" runat="server"></th>
                                </tr>
                                <tr ID="groupPlaceholder" runat="server">
                                </tr>
                            </table>                                    
                        </LayoutTemplate>
                    </asp:ListView>
    <asp:SqlDataSource ID="dsChave" runat="server"></asp:SqlDataSource>
</asp:Content>

Answer 1

从评论中推断，我认为浏览器会向您展示页面的缓存版本，以避免在 IE9 中出现这种情况前往

• 互联网选项
• 在浏览历史中点击设置
• 选择每次我访问网页选项

由于它显示的是缓存版本，因此不会命中您页面的 page_load。 Few more tips

这应该适合你。