自定义控件调用上级页面的函数

Question

我有一个自定义控件,里面有2个RadioButton 都设置了AutoPostBack
当选择其中一个时候,调用上级页面(即引用这个控件的页面)的一个函数,
该如何写代码,C#

Answer 1

参考：
            if (!object.Equals(Request.QueryString["ReturnUrl"], null))
            {
                string fromurl = Request.QueryString["ReturnUrl"].ToString().Trim();
                if (fromurl != "")
                {
                    ViewState["url"] = fromurl;
                }
            }
            else
            {
                if (!object.Equals(Request.ServerVariables["Http_Referer"], null))
                {
                    string urlrefer = Request.ServerVariables["Http_Referer"].ToString().Trim().ToLower();
                    string thisurl = Request.Url.ToString().ToLower();
                    if (urlrefer != "" && urlrefer.IndexOf("/login.aspx") == -1 && thisurl.IndexOf(urlrefer) == -1)
                    {
                        ViewState["url"] = urlrefer;
                    }
                }
            }

Answer 2

我明白lz的意思了，lz换个思路，用事件驱动模型解决这个问题，为控件添加一个事件：public event EventHandler EventName;在RadioButton的处理事件中添加if (null != EventName)
{
    EventName(this, null);
}在页面上只要注册this.userControl.EventName += new EventHandler(userControl_EventName);
根据具体需要选择你的委托delegate原形。
参考一下这篇帖子：
http://topic.csdn.net/u/20071117/21/d515fe07-33a3-43fe-b7a3-18f3d5882b55.html

Answer 3

用户控件：
MyRadioButtonList.ascx<%@ Control Language="C#" AutoEventWireup="true" CodeFile="MyRadioButtonList.ascx.cs" Inherits="MyRadioButtonList" %>
<asp:RadioButtonList ID="rblColors" runat="server" OnSelectedIndexChanged="rblColors_SelectedIndexChanged" AutoPostBack="True">
    <asp:ListItem Text="Red" Value="Red" Selected="true" />
   <asp:ListItem Text="Green" Value="Green" />
   <asp:ListItem Text="Yellow"  Value="Yellow" /> 
</asp:RadioButtonList>MyRadioButtonList.ascx.csusing System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;public partial class MyRadioButtonList : System.Web.UI.UserControl
{
    /// <summary>
    /// Occurs when the selected index of the color list is changed.
    /// </summary>
    public event EventHandler SelectedIndexChanged;    /// <summary>
    /// Gets the selected value of the color list.
    /// </summary>
    public string SelectedValue
    {
        get
        {
            return rblColors.SelectedValue;
        }
    }    protected void rblColors_SelectedIndexChanged(object sender, EventArgs e)
    {
        if (null != SelectedIndexChanged)
        {
            SelectedIndexChanged(this, e);
        }
    }
}
调用页面：
Default.aspx// ...
<%@ Register Src="~/MyRadioButtonList.ascx" TagName="MyRadioButtonList" TagPrefix="uc1" %>
// ...
<uc1:MyRadioButtonList id="MyRadioButtonList1" runat="server" OnSelectedIndexChanged="MyRadioButtonList1_SelectedIndexChanged">
</uc1:MyRadioButtonList>
// ...Default.aspx.csusing System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;public partial class _Default : System.Web.UI.Page 
{
    protected void MyRadioButtonList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        Response.Write(MyRadioButtonList1.SelectedValue);
    }
}