Question

我有一个asp.net下拉列表，从sqldatasource填充。我的问题是第一个选项需要是（全部）。无论如何要在eqldatasource列表之前将这个额外的选项添加到列表中吗？

     <asp:DropDownList ID="REGIONS" runat="server" 
      Width="70px"  AutoPostBack="True" DataTextField="REGION_CD" 
      DataValueField="REGION_CD" DataSourceID="SqlDataSource1"  >
     </asp:DropDownList>

     <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
      ConnectionString="<%$ ConnectionStrings:PRODUCTION %>" 
      ProviderName="<%$ ConnectionStrings:PRODUCTION.ProviderName %>" 
      SelectCommand="select distinct(region_cd) from mv_gauge_filter_dist where     region_cd is not null">
  </asp:SqlDataSource>

感谢名单！

Answer 1

未经测试，但这应该有效：

<asp:DropDownList ID="REGIONS" AppendDataBoundItems="true" runat="server" 
  Width="70px"  AutoPostBack="True" DataTextField="REGION_CD" 
  DataValueField="REGION_CD" DataSourceID="SqlDataSource1"  >
  <asp:ListItem Text="ALL" Value="" />
 </asp:DropDownList>

 <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
  ConnectionString="<%$ ConnectionStrings:PRODUCTION %>" 
  ProviderName="<%$ ConnectionStrings:PRODUCTION.ProviderName %>" 
  SelectCommand="select distinct(region_cd) from mv_gauge_filter_dist where region_cd is not null">
</asp:SqlDataSource>

记下AppendDataBoundItems =“true”......

向下拉列表添加额外选项

1 个答案: