UpdatePanel局部刷新用法

AjaxTest.aspx代码：

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="AjaxTest.aspx.cs" Inherits="WebApplication1.AjaxTest" %>

<!DOCTYPE html>
<html>
<head runat="server">
    <title>AjaxTest Page</title>
</head>
<body>
    <form id="form1" runat="server">
        <asp:ScriptManager ID="ScriptManager1" runat="server">
        </asp:ScriptManager>
        <asp:UpdatePanel ID="UpdatePanel1" runat="server">
            <ContentTemplate>
                <div>
                    <asp:Label ID="Label1" runat="server" Text="国家名称：" Font-Bold="True" Font-Size="Large"></asp:Label>
                    <asp:DropDownList ID="DropDownList0" runat="server" AutoPostBack="true" OnSelectedIndexChanged="DropDownList0_SelectedIndexChanged">
                        <asp:ListItem Text="请选择" Value=""></asp:ListItem>
                        <asp:ListItem Text="亚洲" Value="亚洲"></asp:ListItem>
                    </asp:DropDownList>
                    <asp:DropDownList ID="DropDownList1" runat="server"></asp:DropDownList>                    
                </div>
            </ContentTemplate>
            <Triggers>
                <asp:AsyncPostBackTrigger ControlID="DropDownList0" />
            </Triggers>
        </asp:UpdatePanel>
    </form>
</body>
</html>

AjaxTest.aspx.cs代码：

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace WebApplication1
{
    public partial class AjaxTest : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
        }        

        protected void DropDownList0_SelectedIndexChanged(object sender, EventArgs e)
        {
            SqlConnection conn = new SqlConnection("server=localhost;uid=techtest;pwd=techtest;database=TechTest");
            string sql = "select CountryName from CountryCode";
            SqlDataAdapter myAdapter = new SqlDataAdapter(sql, conn);
            DataSet ds = new DataSet();
            myAdapter.Fill(ds, "CountryCode");
            this.DropDownList1.DataSource = ds.Tables["CountryCode"].DefaultView;
            this.DropDownList1.DataValueField = "CountryName";
            this.DropDownList1.DataTextField = "CountryName";
            this.DropDownList1.DataBind();
        }

    }
}

 页面效果：

posted @ 2015-04-22 08:51  Jakin.zhou  阅读(1810)  评论(0)  编辑  收藏  举报