Question

问：我疯了吗？我有这个活动。这个名字是复制/粘贴的，所以我知道这不是拼写错误。我在这里错过了什么？ （请不要担心参数，请用于培训，我已被告知此时不要使用它们）

      <asp:UpdatePanel ID="UdpEPL" runat="server" UpdateMode="Conditional" Visible="False">
            <Triggers>
                <asp:AsyncPostBackTrigger ControlID="BtnEpl" EventName="BtnEpl_Click" />
            </Triggers>
      <ContentTemplate> 

      <!--some label and textbox controls-->

      <br />
      <asp:Button ID="BtnEpl" runat="server" Text="Submit" AutoPostBack="True" 
                    onclick="BtnEpl_Click" />
      <br />

      <!--the second update panel-->

         <asp:UpdatePanel ID="UdpEplShow" runat="server" UpdateMode="Conditional" Visible="False">
                  <Triggers>
                           <asp:AsyncPostBackTrigger ControlID="BtnEpl" EventName="BtnEpl_Click" />
                  </Triggers>
         <ContentTemplate>      
      <!--more labels displaying the user input from the first update panel-->

代码隐藏：

 protected void BtnEpl_Click(object sender, EventArgs e)
        {
             string connectionString = System.Configuration.ConfigurationManager.ConnectionStrings["MyConnectionString"].ConnectionString;
            string EplQuery = "INSERT INTO EPL (Entity, Employees, CA, MI, NY, NJ, Primex, EplLim, EplSir, Premium, Wage, Sublim) VALUES ('" + TbEplEntity + "', '" + TbEplTotalEmpl + "', '" + TbEplCalEmpl + "', '" + TbEplMichEmpl + "', '" + TbEplNyEmpl + "', '" + TbEplNjEmpl + "', '" + TbEplPrimEx + "', '" + TbEplLim + "', '" + TbEplEplSir + "', '" + TbEplPrem + "', '" + TbEplWage + "', '" + TbEplInvestCost + "')";
            string EplIdQuery = "SELECT SCOPE_IDENTITY() AS LastInsertedInstanceId";

        using (SqlConnection EplConn = new SqlConnection(connectionString))
        {
            EplConn.Open();
            SqlCommand EplCmd = new SqlCommand(EplQuery, EplConn);
            SqlCommand EplIdCmd = new SqlCommand(EplIdQuery, EplConn);
            using (EplCmd)
            using (EplIdCmd)
            {
                EplCmd.ExecuteNonQuery();
                SqlDataReader EplDr = EplIdCmd.ExecuteReader();
                EplDr.Read();
                int lastInsertedInstanceId = Convert.ToInt32(EplDr[0]);


            }

            string x = Request.QueryString["InstanceId"];
            string EplShowQuery = "SELECT Entity, Employees, CA, MI, NY, NJ, Primex, EplLim, EplSir, Premium, Wage, Sublim FROM EPL WHERE InstanceId =" + x;
            using (SqlCommand EplShowCmd = new SqlCommand(EplShowQuery, EplConn))
            {
                SqlDataReader EplDr = EplShowCmd.ExecuteReader();
                EplDr.Read();
                LblEplShowEntity.Text = EplDr.GetString(0);
                LblEplShowTotalEmpl.Text = EplDr.GetInt32(1).ToString();
                LblEplShowCalEmpl.Text = EplDr.GetInt32(2).ToString();
                LblEplShowMichEmpl.Text = EplDr.GetInt32(3).ToString();
                LblEplShowNyEmpl.Text = EplDr.GetInt32(4).ToString();
                LblEplShowNjEmpl.Text = EplDr.GetInt32(5).ToString();
                LblEplShowPrimEx.Text = EplDr.GetInt32(6).ToString();
                LblEplShowLim.Text = EplDr.GetInt32(7).ToString();
                LblEplShowSir.Text = EplDr.GetInt32(8).ToString();
                LblEplShowPrem.Text = EplDr.GetInt32(9).ToString();
                LblEplShowWage.Text = EplDr.GetInt32(10).ToString();
                LblEplShowInvestCost.Text = EplDr.GetInt32(11).ToString();

            }
        }
            UdpEPL.Visible = false;
            UdpEplShow.Visible = true;


    }
}

Answer 1

在触发器中，您只需指定事件名称。

应该是

<asp:AsyncPostBackTrigger ControlID="BtnEpl" EventName="Click" />

代替

<asp:AsyncPostBackTrigger ControlID="BtnEpl" EventName="BtnEpl_Click" />

Answer 2

您是否在某个时候关闭了First ContentTemplate？如果您在按钮标记后执行此操作，请启用ChildrenAsTriggers =＆＃34; true＆＃34;。

Answer 3

为了回答这个问题，我必须指出我的错误。 @Muhammad问我为什么面板设置为visible = false;这是因为我尝试接近页面结构的方式。我想使用ajax来显示输入表单，然后在提交给数据库时隐藏它们并以只读格式显示数据，所以我想我会将这两个表单放在更新面板中并使它们不可见，直到它们被调用为止下拉列表。不幸的是，我发现触发器不会触发不可见的控件。不要引用我，但据我了解，这是因为不可见的服务器端控件不会向浏览器发送标记。学过的知识。

未找到按钮点击事件？

3 个答案: