怎么只让用户控件回传-ASP.NET教程-爱易网页

怎么只让用户控件回传

日期：2014-05-17　浏览次数：20452 次

如何只让用户控件回传
用户控件内部动态添加了若干dropdownlist，同时订阅了它的SelectedIndexChange事件，由于必须要页面回传才会触发，有没有办法只让用户控件自身回传，而所在页面不回传？

------解决方案--------------------
ajax无刷新应用
------解决方案--------------------
UpdatePanel可以实现

既然不会传，直接使用ajax做东西更省事
------解决方案--------------------
以前贴过的一个demo

HTML code

<%@ Page Language="C#" %>

<script runat="server">
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            this.Calendar1.Style["position"] = "absolute";
            this.TextBox1.DataBind();
        }
    }

    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        this.DropDownList2.Items.Clear();
        switch (this.DropDownList1.SelectedValue)
        {
            case "北京":
                this.DropDownList2.Items.Add("天安门广场");
                this.DropDownList2.Items.Add("颐和园");
                this.DropDownList2.Items.Add("雍和宫");
                this.DropDownList2.Items.Add("红螺寺");
                break;
            case "上海":
                this.DropDownList2.Items.Add("崇明岛");
                this.DropDownList2.Items.Add("外滩");
                this.DropDownList2.Items.Add("万佛阁");
                break;
            case "香港":
                this.DropDownList2.Items.Add("海洋公园");
                this.DropDownList2.Items.Add("半岛酒店");
                break;
        }
    }
    protected void DropDownList2_SelectedIndexChanged(object sender, EventArgs e)
    {
        ShowResult();
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        if (this.Calendar1.Visible)
            SetupTheDate();
        else
        {
            try
            {
                this.Calendar1.SelectedDate = DateTime.Parse(this.TextBox1.Text);
                this.Calendar1.VisibleDate = this.Calendar1.SelectedDate;
            }
            catch
            {
            }
            this.Calendar1.Visible = true;
        }
    }

    protected void Calendar1_SelectionChanged(object sender, EventArgs e)
    {
        SetupTheDate();
    }

    private void SetupTheDate()
    {
        this.TextBox1.Text = this.Calendar1.SelectedDate.ToShortDateString();
        this.Calendar1.Visible = false;
        ShowResult();
    }

    void ShowResult()
    {
        this.Label1.Text = "您选择" + this.TextBox1.Text + "去" + this.DropDownList2.SelectedValue;
        UpdatePanel3.Update();
    }
</script>
<!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 id="Head1" runat="server">
    <title>演示使用基本的asp.net ajax功能</title>
</head>
<body>
    <form id="form1" runat="server">
    <asp:ScriptManager ID="ScriptManager1" runat="server" />
    <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
        <ContentTemplate>
            <asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">
                <asp:ListItem>--请选择--</asp:ListItem>
                <asp:ListItem>北京</asp:ListItem>
                <asp:ListItem>上海</asp:ListItem>
                <asp:ListItem>香港</asp:ListItem>
            </asp:DropDownList>
            <asp:DropDownList ID="DropDownList2" runat="server" AutoPostBack="True" OnSelectedIndexCh

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怎么只让用户控件回传

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