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c#奇怪的panel显示/隐藏

我在一个界面中用到多个panel,默认是隐藏的.
在pageload的if (!IsPostBack)中我去读数据库,根据读出来的数据来设置各个panel的显示还是隐藏.

我用中断来查,发现能读出数据,也能设置panel的visible属性,
但奇怪的是,界面上显示的却一直是隐藏

以下是后台代码:

        if (!IsPostBack)
        {
            id = Request.Params["id"].ToString().Trim();
            ViewState["dqid"] = id;
            DateTime newDate = DateTime.Now;
            SqlConnection con = new SqlConnection(source);
            con.Open();
            string sql = null;
            SqlCommand cmd = new SqlCommand(sql, con);
            SqlDataReader reader = null;

            #region //读记录
            sql = "select * from cw_Pingzheng_main where id='" + (string)ViewState["dqid"] + "'";
            cmd.CommandText = sql;
            reader = cmd.ExecuteReader();
            if (reader.Read())
            {
                string pzdate = reader["pzdate"].ToString();
                DateTime dt = Convert.ToDateTime(pzdate);
                string y = dt.Year.ToString();
                string m = dt.Month.ToString();
                string d = dt.Day.ToString();
                txtriqi.Text = y + "-" + m + "-" + d;
                listzi.SelectedValue = reader["zi"].ToString();
                txthao.Text = reader["hao"].ToString();
                txtfujian.Text = reader["fujian"].ToString();
                txtmm.Text = reader["remark"].ToString();
                if (reader["edman"].ToString().Trim() == null || reader["edman"].ToString().Trim() == "" || reader["edman"].ToString().Trim() == string.Empty)
                {
                    Label_jizhang.Text = reader["crman"].ToString();
                }
                else
                {
                    Label_jizhang.Text = reader["edman"].ToString();
                }
            }
            else
            {
                //读记录失败
                Page.ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('警告，读取凭证主表失败！');</script>");
                return;
            }
            reader.Close();

            SqlConnection con2 = new SqlConnection(source);
            con2.Open();
            string sql2 = null;
            SqlCommand cmd2 = new SqlCommand(sql2, con2);
            SqlDataReader reader2 = null;

            sql = "select * from cw_Pingzheng_detail where id='" + id + "' order by jie_amt desc";
            cmd.CommandText = sql;
            reader = cmd.ExecuteReader();
            string temp = "";
            TextBox tb = null;
            Label tc = null;
            Panel pl1 = null;
            Panel pl2 = null;
            Panel pl3 = null;
            DropDownList dd = null;
            string tempd = "";
            string tempa = "";
            string tempb = "";
            double tempc = 0;
            double ttj = 0;
            double ttd = 0;
            int i = 0;
            while (reader.Read())
            {
                //摘要
                temp = "txt_zhaiyao" + (i + 1).ToString().Trim();
                tb = (TextBox)this.Page.FindControl(temp);
                tb.Text = reader["zhaiyao"].ToString().Trim();


                //科目
                temp = "txtkemu" + (i + 1).ToString().Trim();
                tb = (TextBox)this.Page.FindControl(temp);

                //科目ID
                temp = "Laa" + (i + 1).ToString().Trim();
                tc = (Label)this.Page.FindControl(temp);
                tc.Text = reader["FaccountID"].ToString().Trim();
                tempd = tc.Text.ToString().Trim();

                sql2 = "select * from cw_GLAcct where FaccountID='" + tempd + "'";
                cmd2.CommandText = sql2;
                reader2 = cmd2.ExecuteReader();
                if (reader2.Read())
                {
                    tempa = reader2["Fnumber"].ToString().Trim();
                    tempb = reader2["Fname"].ToString().Trim();
                    tb.Text = tempa + " - - " + tempb;

                    //科目方向
                    temp = "Lab" + (i + 1).ToString().Trim();
                    tc = (Label)this.Page.FindControl(temp);
                    tempb = reader2["jiedai"].ToString().Trim();
                    if (tempb == "jie")
                    {
                        tc.Text = "借方科目";
                    }
                    else
                    {
                        tc.Text = "贷方科目";
                    }

                    //显示还是隐藏3个Panel
                    temp = "P" + (i + 1).ToString().Trim();
                    pl1 = (Panel)this.Page.FindControl(temp);
                    tempa = reader2["buhesuanwaibi"].ToString().Trim();
                    if (tempa== "False")
                    {
                        pl1.Visible = true;
                    }
                    else
                    {
                        pl1.Visible = false;
                    }
                    //
                    temp = "w" + (i + 1).ToString().Trim();
                    pl2 = (Panel)this.Page.FindControl(temp);
                    tempa = reader2["hesuansuoyouwaibi"].ToString().Trim();
                    if (tempa == "True")
                    {
                        pl2.Visible = true;
                    }
                    else
                    {
                        pl2.Visible = false;
                    }
                    //
                    temp = "J" + (i + 1).ToString().Trim();
                    pl3 = (Panel)this.Page.FindControl(temp);
                    tempa = reader2["jiesuanleikemu"].ToString().Trim();
                    if (tempa == "True")
                    {
                        pl3.Visible = true;
                    }
                    else
                    {
                        pl3.Visible = false;
                    }
                }
                reader2.Close();


                //借方金额
                temp = "txtkemu_jie_amt" + (i + 1).ToString().Trim();
                tb = (TextBox)this.Page.FindControl(temp);
                tempc = double.Parse(reader["jie_amt"].ToString().Trim());
                if (tempc == 0)
                {
                    tb.Text = "";
                }
                else
                {
                    tb.Text = tempc.ToString("0.00");
                    ttj = ttj + double.Parse(tb.Text.ToString());
                }
                //贷方金额
                temp = "txtkemu_dai_amt" + (i + 1).ToString().Trim();
                tb = (TextBox)this.Page.FindControl(temp);
                tempc = double.Parse(reader["dai_amt"].ToString().Trim());
                if (tempc == 0)
                {
                    tb.Text = "";
                }
                else
                {
                    tempc = double.Parse(reader["dai_amt"].ToString().Trim());
                    tb.Text = tempc.ToString("0.00");
                    ttd = ttd + double.Parse(tb.Text.ToString());
                }
                //外币
                temp = "txtwaibi_waibi" + (i + 1).ToString().Trim();
                tb = (TextBox)this.Page.FindControl(temp);
                tempa = reader["wb"].ToString().Trim();
                if (tempa != "RMB")
                {
                    P1.Visible = true;
                    tb.Text = tempa;
                }
                else
                {
                    P1.Visible = false;
                }

                //汇率
                temp = "txtwaibi_huilv" + (i + 1).ToString().Trim();
                tb = (TextBox)this.Page.FindControl(temp);
                tempc = double.Parse(reader["wb_huilv"].ToString().Trim());
                if (tempa != "RMB")
                {
                    tb.Text = tempc.ToString();
                }

                //外币金额
                temp = "txtwaibi_amt" + (i + 1).ToString().Trim();
                tb = (TextBox)this.Page.FindControl(temp);
                tempc = double.Parse(reader["wb_amt"].ToString().Trim());
                if (tempa != "RMB")
                {
                    tb.Text = tempc.ToString("0.00");
                }


                //结算方式
                temp = "list_jsfs" + (i + 1).ToString().Trim();
                dd = (DropDownList)this.Page.FindControl(temp);
                dd.SelectedValue = reader["js_fs"].ToString().Trim();


                //结算单号
                temp = "txt_jsh" + (i + 1).ToString().Trim();
                tb = (TextBox)this.Page.FindControl(temp);
                tb.Text = reader["js_no"].ToString().Trim();


                //结算日期
                temp = "txt_jsrq" + (i + 1).ToString().Trim();
                tb = (TextBox)this.Page.FindControl(temp);
                tb.Text = reader["js_date"].ToString().Trim();



                
                i++;
            }
            reader.Close();
            con.Close();
            con2.Close();

            total_jie_amt.Text = ttj.ToString().Trim();
            total_dai_amt.Text = ttd.ToString().Trim();

            #endregion //读记录

--------------------编程问答-------------------- --------------------编程问答-------------------- 重点在这里:


//显示还是隐藏3个Panel
  temp = "P" + (i + 1).ToString().Trim();
  pl1 = (Panel)this.Page.FindControl(temp);
  tempa = reader2["buhesuanwaibi"].ToString().Trim();
  if (tempa== "False")
  {
  pl1.Visible = true;
  }
  else
  {
  pl1.Visible = false;
  }
  //
  temp = "w" + (i + 1).ToString().Trim();
  pl2 = (Panel)this.Page.FindControl(temp);
  tempa = reader2["hesuansuoyouwaibi"].ToString().Trim();
  if (tempa == "True")
  {
  pl2.Visible = true;
  }
  else
  {
  pl2.Visible = false;
  }
  //
  temp = "J" + (i + 1).ToString().Trim();
  pl3 = (Panel)this.Page.FindControl(temp);
  tempa = reader2["jiesuanleikemu"].ToString().Trim();
  if (tempa == "True")
  {
  pl3.Visible = true;
  }
  else
  {
  pl3.Visible = false;
  }

这一端设置了显示/隐藏后,客户端并没有效果.

客户端代码:





              <asp:Panel runat="server" ID="P1" Visible="false" >

              <tr style="background-color:White; text-align:left; ">

                <td>

                    <asp:Label ID="Lab1" name="Lab1" runat="server" Text="" ForeColor="White"></asp:Label>

                    <asp:Label ID="Laa1" name="Laa1" runat="server" Text="" ForeColor="White"></asp:Label>

                </td>

                <td onkeyup="Waibi_chg(1)" >外币<asp:TextBox ID="txtwaibi_waibi1" runat="server" Width="20%" style="text-align:center;border-style:none; border-width:0; height:15px; background-color:#EFEFEF;" ReadOnly="true"></asp:TextBox> 汇率<asp:TextBox ID="txtwaibi_huilv1" runat="server" Width="20%" style="text-align:center;border-style:none; border-width:0; height:15px; background-color:#EFEFEF;"></asp:TextBox> 金额<asp:TextBox ID="txtwaibi_amt1" runat="server" Width="20%" style="text-align:center;border-style:none; border-width:0; height:15px; background-color:#EFEFEF;"></asp:TextBox>

                </td>

                <td colspan="2" align="left"><asp:Panel runat="server" ID="w1" Visible="false" ><input id="bt_waibi1" type="button" value=".." style="width:15px; height:20px" onclick="div_waibi(1)" title="选择外币" /></asp:Panel> </td>

              </tr>

              </asp:Panel>

              <asp:Panel runat="server" ID="J1" Visible="false" >

              <tr style="background-color:White; text-align:left; ">

                <td> </td>

                <td colspan="3">结算方式<asp:DropDownList ID="list_jsfs1" runat="server" DataSourceID="SqlDataSource_jsfs1" DataTextField="fsettcode" DataValueField="id" Width="60px" Height="20px" BackColor="#EFEFEF" AppendDataBoundItems="True"></asp:DropDownList><asp:SqlDataSource ID="SqlDataSource_jsfs1" runat="server" ConnectionString="<%$ConnectionStrings:cwcon %>"></asp:SqlDataSource> 结算单号<asp:TextBox ID="txt_jsh1" runat="server" Width="10%" style="text-align:center;border-style:none; border-width:0; height:15px; background-color:#EFEFEF;"></asp:TextBox> 结算日期<asp:TextBox ID="txt_jsrq1" runat="server" onclick="setDay(this);" style="text-align:center;border-style:none; border-width:0; height:15px; background-color:#EFEFEF;"></asp:TextBox>

                </td>

              </tr>

              </asp:Panel>



--------------------编程问答--------------------  <asp:Panel runat="server" ID="J1" Visible="false" >
去掉 Visible="false" 如果你断点调试过你就知道，程序是先从Page_Load，然后ASPX页面里控件视图会按照设定的属性来Render
后台里设置
if (tempa== "False")
  {
  pl1.Visible = true;
  }
  else
  {
  pl1.Visible = false;
  }
可以简化一下 pl1.Visible = tempa== "False"; 

还有这里
if (reader["edman"].ToString().Trim() == null || reader["edman"].ToString().Trim() == "" || reader["edman"].ToString().Trim() == string.Empty)简化下
if(reader["edman"] == DBNull.Value || reader["edman"].ToString().Trim().Length == 0) --------------------编程问答-------------------- 中间有return 为了确保隐藏，你可以这样
if(reader.Read())
{
   pl1.Visible = pl3.Visible  = pl3.Visible = false; 
   //动态设置
} --------------------编程问答-------------------- 
if (!IsPostBack)

{

  pl1.Visible = pl3.Visible = pl3.Visible = false;  

  //动态设置

}
--------------------编程问答-------------------- 太长了，赖的看 --------------------编程问答-------------------- 可能是我没说清楚。
我只是在后台设置pl3.Visible = true; 时，客户端并没有响应显示动作。 --------------------编程问答-------------------- pl1,pl2,pl3 都是Panel

我是用一个循环去读数据库来设置各行的panel的显示或隐藏

望高手指点 --------------------编程问答-------------------- Debugger下吧，

在load完成事件中看下控件的属性，在看在那个地方设错之乐 --------------------编程问答-------------------- 顶下 呵呵 太长了。。。。
补充：.NET技术 ,  C#

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