如何使用 ASP.NET 和 SQL QUERY 在 Repeater 中加载 DropdownList 框

Question

我可以加载文本框，但我无法加载下拉框：

<asp:Repeater ID="RtpDetails" runat="server">             
    <HeaderTemplate>
        <tr>
           <td width="20%" align="left"><strong>Item Name</strong></td>
           <td width="20%" align="left"><strong>Price</strong></td
        </tr>
    </HeaderTemplate>
    <ItemTemplate>
       <td>
           <asp:TextBox ID="Txtitem" Value='<%#Eval("Product_Name") %>' runat="server"></asp:TextBox>
       </td>
       <td>
           <asp:DropDownList ID="drp" runat="server"> </asp:DropDownList>
       </td> 
    </ItemTemplate>
</asp:Repeater>

C#：我现在正在使用它进入文本框，我正在尝试根据以下 SQL 查询获取值

protected void BtnSrc_Click(object sender, EventArgs e)
{
    RtpDetails.DataSource = GetData();
    RtpDetails.DataBind();
}

public DataTable GetData()
{
    string sql = "SELECT Auto_SL, OrderNo, Date, CustomerName, ProductID, Price, Total, Quantity, Product_Name FROM  Order_Details WHERE OrderNo='" + TxtSearch.Text+ "'"; ///---- For test  

    Connstring.conn.Open();

    SqlCommand cmd = new SqlCommand(sql, Connstring.conn);
    SqlDataAdapter da = new SqlDataAdapter(cmd);

    DataTable dt = new DataTable();
    da.Fill(dt);

    Connstring.conn.Close();
    return dt;
}

Answer 1

您应该必须在下拉列表中添加数据源。 以下是示例代码。

   <asp:Repeater ID="RtpDetails" runat="server">
            <HeaderTemplate>
                <td>Item Name
                </td>
                <td>Price
                </td>
            </HeaderTemplate>
            <ItemTemplate>

                <td>
                    <asp:TextBox ID="Txtitem" runat="server"></asp:TextBox></td>
                <td>
                    <asp:DropDownList ID="drp" runat="server" DataTextField="Product_Name" DataValueField="Product_ID" DataSource='<%# setProduct()%>'>
                    </asp:DropDownList></td>

            </ItemTemplate>
        </asp:Repeater>
        <asp:Button ID="BtnSrc" Text="Source" runat="server" OnClick="BtnSrc_Click" />

文件隐藏代码

    protected void BtnSrc_Click(object sender, EventArgs e)
    {
        RtpDetails.DataSource = GetData();
        RtpDetails.DataBind();

    }

    public DataTable setProduct()
    {
        DataTable dt = new DataTable();
        return GetData();
    }

    public DataTable GetData()
    {
        string sql = "SELECT Product_ID, Product_Name FROM  Order_Details"; ///---- For test  
        SqlConnection Connstring = new SqlConnection("Data Source=localhost;Initial Catalog=test;User ID=sa;Password=123;");
        Connstring.Open();
        SqlCommand cmd = new SqlCommand(sql, Connstring);
        SqlDataAdapter da = new SqlDataAdapter(cmd);
        DataTable dt = new DataTable();
        da.Fill(dt);
        Connstring.Close();
        return dt;
    }