Question

大家好，我需要帮助。我已经有这个问题了近一天了。下拉列表不会从数据库中填充

以下是我正在使用的代码：

＆lt;％@ Page Title =“”Language =“VB”MasterPageFile =“〜/ Site.master”AutoEventWireup =“false”CodeFile =“PhotoAlbum.aspx.vb”Inherits =“PhotoAlbum”％＆gt;

以弗所书的成员5:10写真集！

<asp:SqlDataSource ID="categoriesDataSource" runat="server" 
    ConnectionString="<%$ ConnectionStrings:ConnectionString %>" 



    SelectCommand="SELECT [CategoryID], [Name] FROM [Categories] WHERE ([UserId] = @UserId) ORDER BY [Name]">
    <SelectParameters>
        <asp:QueryStringParameter Name="UserId" QueryStringField="ID"/>
    </SelectParameters>
</asp:SqlDataSource>

<br />

<br />

<h1 style="font-weight:bold">Filter Pictures By Category:
   <asp:DropDownList ID="categories" runat="server" 
                    AppendDataBoundItems="True" 
              DataSourceID="categoriesDataSource" AutoPostBack="True"

DataTextField =“Name”DataValueField =“CategoryID”＆gt;

</asp:Content>

我需要帮助pls

Answer 1

在页面指令

中设置AutoEventWireup =“true”

Answer 2

我很快创建了一个包含以下代码的测试页面，它对我有用：

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="testddl.aspx.cs" Inherits="testddl" %>

<!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 runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>

        <asp:DropDownList ID="DropDownList1" runat="server" 
            DataSourceID="SqlDataSource1" DataTextField="CategoryName" 
            DataValueField="CategoryID">
        </asp:DropDownList>

    </div>
    <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
        ConnectionString="<%$ ConnectionStrings:TESTDBConnectionString %>" 
        SelectCommand="SELECT [CategoryID], [CategoryName] FROM [Categories] WHERE ([UserID] = @UserID)">
        <SelectParameters>
            <asp:QueryStringParameter DefaultValue="1" Name="UserID" QueryStringField="ID" 
                Type="Int32" />
        </SelectParameters>
    </asp:SqlDataSource>
    </form>
</body>
</html>

dbo.Categories：

alt text

截图：

alt text

下拉列表不会填充数据库中的值

2 个答案: