Dropdownlist不会在udpdatepanel中加载数据 [英] Dropdownlist is not loading data inside the udpdatepanel

问题描述

我在面板中使用下拉列表和评级控件。下载列表中没有加载数据。下面是我的代码。请检查并帮助我

 <   asp：UpdatePanel     ID   =  pnlRating    runat   = 服务器 >  
 <  触发器   >  
 <   asp：AsyncPostBackTrigger     ControlID   =  ratingControl    EventName   = 已更改    /  >  
 
 <   / Triggers  >  
 <  触发器 >  
 <   asp：AsyncPostBackTrigger     ControlID   =  DdlStore    EventName   =  SelectedIndexChanged    /  >  
 <   / Triggers  >  
 <   ContentTemplate  >  
 
 <   table     width   =  50％ >  
  <   tr  >  
 <   td     class   =  style1 >  
选择StoreId <   / td  >  
 <   td  >  
 <   asp：DropDownList     ID   =  DdlStore < span class =code-attribute>   EnableViewState   =  true    runat   =   server    AutoPostBack   =  True  
   
    < span class =code-attribute>              高度  =  17px   宽度  =  152px  >  
 <   / asp：DropDownList  >  
 <   / td  >  
 <   / tr  >  
 <   tr  >  
 < ;   td     class  < span class =code-keyword> =  style1 >  
 <   b  > 平均评分：<   / b  >  
 <   / td  >  
 <   td  >  
 <   asp：评分    ID   =  ratingControl    runat   =  server    AutoPostBack   =  true  
   
                                   EmptyStarCssClass   =  ratingEmpty    FilledStarCssClass   =  ratingFilled  
   
                          < span class =code-attribute>         OnChanged   =  RatingControlChanged    StarCssClass   =  ratingEmpty  
   
  < span class =code-attribute>                                 WaitingStarCssClass   =  ratingSaved >  
 <   / asp：评分 >  
 <   b  >  
 <   asp：Label     ID   =  lbltxt    runat   =  server    /  >  
 <   / b  >  
 <   / td  >  
 <   / tr  >  
 <   tr  >  
 <   td     class   =  style1 >  
 & nbsp;   <   / td  >  
 <   td  >  
 & nbsp;  <   / td  >  
 <   / tr  >  
 <   tr  >  
 <   td     class   =  style1 >  
 & nbsp;  <   / td  >  
 <   td  > ;  
 <   asp：按钮    ID   =  BtnSend    runat   =  server    onclick   =  BtnSend_Click   文字  = 发送   
   
                                   BackColor   = ＃996633    BorderC olor   = ＃CC3300    BorderStyle   =  Solid < span class =code-attribute>  宽度  =  150px    /  > ;  
 <   / td  >  
 <   / tr  >  
 <   / table  >  
 <   / ContentTemplate  >  
 <   / asp ：UpdatePanel  >  

解决方案

调用您的LoadDropDown（ ）功能到 Databound 下拉列表事件。



<前lang =cs> 受保护 void DropDownList1_DataBound（ object sender，EventArgs e）
{
LoadDropDown（）;
}

I am using dropdownlist and rating control inside the panel. dropdownlist in not loading data. below is my code. Please check it and help me

<asp:UpdatePanel ID="pnlRating" runat="server">
<Triggers >
<asp:AsyncPostBackTrigger ControlID="ratingControl" EventName="Changed" />

</Triggers>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="DdlStore" EventName="SelectedIndexChanged" />
</Triggers>
<ContentTemplate>

<table width="50%">
<tr>
<td class="style1">
    Select StoreId</td>
<td>
    <asp:DropDownList ID="DdlStore" EnableViewState="true" runat="server" AutoPostBack="True"

        Height="17px" Width="152px">
    </asp:DropDownList>
    </td>
</tr>
    <tr>
        <td class="style1">
            <b>Average Rating:</b>
        </td>
        <td>
            <asp:Rating ID="ratingControl" runat="server" AutoPostBack="true"

                EmptyStarCssClass="ratingEmpty" FilledStarCssClass="ratingFilled"

                OnChanged="RatingControlChanged" StarCssClass="ratingEmpty"

                WaitingStarCssClass="ratingSaved">
            </asp:Rating>
            <b>
            <asp:Label ID="lbltxt" runat="server" />
            </b>
        </td>
    </tr>
    <tr>
        <td class="style1">
            &nbsp;</td>
        <td>
            &nbsp;</td>
    </tr>
    <tr>
        <td class="style1">
            &nbsp;</td>
        <td>
            <asp:Button ID="BtnSend" runat="server" onclick="BtnSend_Click" Text="Send"

                BackColor="#996633" BorderColor="#CC3300" BorderStyle="Solid" Width="150px" />
        </td>
    </tr>
</table>
</ContentTemplate>
</asp:UpdatePanel>

解决方案

call your LoadDropDown() function to Databound event of dropdownlist.

protected void DropDownList1_DataBound(object sender, EventArgs e)
       {
          LoadDropDown();
       }

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