多个DropDownList，为啥不能连用

2013-09-28
多个DropDownList，为什么不能连用%@ Page LanguageC# AutoEventWireuptrue CodeFileema.aspx.cs
多个DropDownList，为什么不能连用
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ema.aspx.cs" Inherits="ema" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>设备维护</title>
    <style type="text/css">
        .style3
        {
            width: 163px;
        }
        .style4
        {
            width: 110px;
        }
        .style5
        {
            height: 21px;
            width: 110px;
        }
        .style7
        {
            width: 158px;
        }
        #table1
        {
            width: 883px;
        }
        .style10
        {
            height: 13px;
            width: 178px;
        }
        .style11
        {
            width: 137px;
            height: 22px;
        }
        .style12
        {
            width: 888px;
        }
        .style14
        {
            width: 318px;
            height: 22px;
        }
        .style15
        {
            height: 22px;
            width: 100px;
        }
        .style20
        {
            width: 238px;
        }
        .style21
        {
            width: 172px;
        }
        .style22
        {
            width: 83px;
        }
        .style23
        {
            width: 116px;
        }
        .style25
        {
            width:45px;
        }
        #table2
        {
            width: 774px;
        }
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <P align="center">  &nbsp;</p>
    <div>
    <table >
 <table class="border" cellSpacing="0" cellPadding="5" border="0" 
            style="width: 924px; height: 236px;">
<TR> 


<td ><P align="center">  通讯设备检查结果 </p></td>  
 
</TR> 
<TR> 
<TD class="style12" colspan="3"  align="left">
    
        日期：<asp:TextBox ID="Ndate" runat="server"></asp:TextBox>
    
    &nbsp;地点：<asp:DropDownList ID="tb_room" runat="server" AutoPostBack="True">
            <asp:ListItem>常平会议室</asp:ListItem>
            <asp:ListItem>金美会议室</asp:ListItem>
            <asp:ListItem>东坑会议室</asp:ListItem>
            <asp:ListItem>大朗会议室</asp:ListItem>
            <asp:ListItem>桥头会议室</asp:ListItem>
            <asp:ListItem>培训室</asp:ListItem>
            <asp:ListItem>一号会议室</asp:ListItem>
        </asp:DropDownList>
    
    </TD></TR>
      
      <TR><TD align="left" class="style12"> 
       <TABLE align="left" border="0" 
              style="width: 924px; height: 165px; margin-left: 0px;">      
        <TR>
         <TD class="style7" colspan="1" align="right" bgcolor="#E9F0F7">电源线路是否正常：</TD>
         <TD align="left" colspan="1">
             <asp:DropDownList ID="L1" runat="server" AutoPostBack="True"  Width="127px" 
                 Height="21px" >
                 <asp:ListItem>是</asp:ListItem>
                 <asp:ListItem>否</asp:ListItem>
             </asp:DropDownList>
            </TD>

         <TD class="style3" align="right"  bgcolor="#E9F0F7">交换机是否可以连网：</TD>
         <TD class="style20" colspan="1">
             <asp:DropDownList ID="L2" runat="server" AutoPostBack="True" Width="127px" 
                 Height="21px" >
                 <asp:ListItem>是</asp:ListItem>
                 <asp:ListItem>否</asp:ListItem>
             </asp:DropDownList>
            </TD>       
       </TR>
       <TR>  
          <TD class="style7" align="right" bgcolor="#E9F0F7">网线接口是否松脱：</TD> 
          <TD class="style4">
              <asp:DropDownList ID="L3" runat="server" AutoPostBack="True" Width="127px" 
                  Height="21px" >
                  <asp:ListItem>是</asp:ListItem>
                  <asp:ListItem>否</asp:ListItem>
              </asp:DropDownList>
           </TD>
      

          <TD class="style3" align="right" bgcolor="#E9F0F7">网络跳线是否足够：</TD>
          <TD class="style20">
               <asp:DropDownList ID="L4" runat="server" AutoPostBack="True" Width="127px" 
                   Height="21px" > 
 
                   <asp:ListItem>是</asp:ListItem>
                   <asp:ListItem>否</asp:ListItem>
               </asp:DropDownList>
           </TD>
  
        </TR>
        <tr>
          <td align="right" class="style7"  bgcolor="#E9F0F7">电话线路是否正常：</TD>
          <TD class="style4">
               <asp:DropDownList ID="L5" runat="server" AutoPostBack="True"  Width="127px" Height="21px">
                   <asp:ListItem>是</asp:ListItem>
                   <asp:ListItem>否</asp:ListItem>
               </asp:DropDownList>
            </TD>

          <td align="right" class="style3" bgcolor="#E9F0F7">电话设备是否正常：</TD>
          <TD class="style20">
               <asp:DropDownList ID="L6" runat="server" AutoPostBack="True" Width="127px" 
                   Height="21px" >
                   <asp:ListItem>是</asp:ListItem>
                   <asp:ListItem>否</asp:ListItem>
               </asp:DropDownList>
            </TD>

        </TR>
        <tr>       
          <td align="right" class="style7" bgcolor="#E9F0F7"> 投影设备是否正常：</TD>
          <TD class="style5">
               <asp:DropDownList ID="L7" runat="server" AutoPostBack="True" Width="127px" 
                   Height="21px" >
                   <asp:ListItem>是</asp:ListItem>
                   <asp:ListItem>否</asp:ListItem>
               </asp:DropDownList>
            </TD>
               
          <TD class="style3" align="right" bgcolor="#E9F0F7">工作桌面是否整洁：</TD> 
          <TD class="style20">
             <asp:DropDownList id="L8" runat="server" Width="127px" Height="21px"  
                  AutoPostBack="True" >
                 <asp:ListItem>是</asp:ListItem>
                 <asp:ListItem>否</asp:ListItem>
                 </asp:DropDownList></TD>  
       </tr>             
        </table>
   </TD></TR> 
   <table id="table1" height="70px" rows=2>
   <tr>
   <td colspan="0" class="style15">

   
       处理内容</td>
   
    <td colspan="0" Height="16px" class="style21"> 处理结果：</td>
    <td class="style11">
        <asp:TextBox ID="result" runat="server"  Width="60px" ></asp:TextBox> 
 
    </td>
    <td colspan="0" Height="21px" class="style23"> 处理日期：</td>
    <td  Width="80px" >
        <asp:TextBox ID="ctime" runat="server" Width="115px"></asp:TextBox>
       </td>
  <td   Height="21px" class="style22">检查人：</td>
  <td class="style14">
      <asp:TextBox ID="user" runat="server" Width="91px" ></asp:TextBox>
       </td>
   </tr>
   <tr>
      <td colspan="0" class="style10">

   
          &nbsp;</td>
       <td Height="16px" class="style21" > 备注：</td>
       <td class="tdbg" colspan="7" style="height: 17px; width: 120px">
              <asp:TextBox id="tb_remark" runat="server" Width="505px" TextMode="MultiLine" 
                  Rows="2" Height="47px"></asp:TextBox></TD>
   </tr>
   </table>
   
    <table id="table2" height="40px" rows=2>
   <tr>
   <td colspan="0" class="style25">

   
 &nbsp;</td>
   
    <td colspan="0" Height="16px" class="style25"> 
        <asp:Button ID="BtnAdd" runat="server" Text="新建" Width="52px" onclick="BtnAdd_Click" 
           />
       </td>
    <td class="style25">
        &nbsp;</td>
    <td colspan="0" Height="21px" class="style25"> 
        <asp:Button ID="BtnEdit" runat="server" Text="编辑" Width="52px" 
         style="height: 26px" onclick="BtnEdit_Click"  />
       </td>
    <td class="style25" >
        &nbsp;</td>
  <td   Height="21px" class="style25">
      <asp:Button ID="BtnSave" runat="server" Text="保存" Width="52px" 
          />
       </td>
  
  <td class="style25"></td>
      <td   Height="21px" class="style25">
          <asp:Button ID="Button4" runat="server" Text="Button" />
       </td>
   </tr>
   </table>
   

  </table>
    
    
    </div>
    </form>
    
    </body>
</html>
Visual studio2008编写的 dropdownlist c#
[解决办法]
选择一个downlist后，自动刷新重新执行了page_load里的函数SetOpx("INIT")，因asp:downlist是服务器控件，可以改成input控件
[解决办法]
这个是非常基本的概念，你找本正规的asp.net教程看看，了解人家为什么在page_load里边要写上 if(!Postback)。
[解决办法]
if (!Postback)
{
说明是第一次访问，做初始化
}
else
{
控件回发
}
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