关于Web用户控件如何读取子控件的值，自定义事件，动态控制子控件状态的应用。
效果图：
/*用户控件界面开始*/
<%@ Control Language="C#" AutoEventWireup="true" CodeFile="SearchBar.ascx.cs" Inherits="Singcn.UC.SearchBar" %>
<table width="100%" border="0" cellpadding="0" cellspacing="0" class="coolBar">
<tr>
<td style="WIDTH: 3px; CURSOR: move; height: 26px;"><DIV CLASS="TBHandle"></DIV></TD>
<td style="height: 26px">
查询：<asp:TextBox ID="search_txt" runat="server" CssClass="TextBox" Width="120px"></asp:TextBox>
<asp:DropDownList ID="search_lx" runat="server">
</asp:DropDownList>
<asp:Button ID="BOk" runat="server" CssClass="Button" Text="查询" OnClick="BOk_Click"/>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label></td>
</tr>
</table>
/*用户控件界面结束*/
/*用户控件代码开始*/
namespace MY.UC
{
using 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 delegate void BOkClickHandler(object sender, System.EventArgs e); //定义查询按钮委托
//自定义枚举,用户控制查询条显示模式
public enum EBarType { mintype = 1, usertype, xwxxtype };
//1=缺省模式,2=操作员模式,3=新闻管理模式
public partial class SearchBar : System.Web.UI.UserControl
{
public event BOkClickHandler BOkClick;//定义事件
public string SearchTxt//设置文本框内容
{
get { return this.search_txt.Text; }//this.search_txt.Text
set { this.search_txt.Text = value; }
}
private EBarType _BarType;
public EBarType BarType//设置显示模式
{
get { return _BarType; }
set
{
_BarType = value;
switch (value)
{
case EBarType.xwxxtype:
showxwxx();
break;
case EBarType.usertype:
showuser();
break;
default://EBarType.mintype;
showmin();
break;
}
}
}
private bool _TxtVisible;
public bool TxtVisible
{
get { return _TxtVisible; }
set
{
_TxtVisible = value;
this.search_txt.Visible = _TxtVisible;
}
}//控制文本框是否显示
private bool _LXVisible;
public bool LXVisible
{
get { return _LXVisible; }
set
{
_LXVisible = value;
this.search_lx.Visible = _LXVisible;
}
}//控制下拉列表是否显示
//private string _SearchLX;
public string SearchLX
{
get { return this.search_lx.SelectedItem.Value; }//this.search_lx.SelectedItem.Value;_SearchLX
set
{
for (int myi = 0; myi < search_lx.Items.Count ; myi++)
{
if (search_lx.Items[myi].Value == value)
{
search_lx.SelectedIndex = myi;
break;
}
}
}
}//设置下拉列表的值
protected void Page_Load(object sender, EventArgs e)
{
}
#region web 窗体设计器生成的代码
override protected void OnInit(EventArgs e)
{
InitializeComponent();
base.OnInit(e);
}
private void InitializeComponent()
{
this.BOk.Click += new System.EventHandler(this.BOk_Click);//这一行很重要
}
#endregion
protected void BOk_Click(object sender, EventArgs e)
{
// this._SearchTxt = this.search_txt.Text;
//this._SearchLX = this.search_lx.SelectedItem.Value;
if (BOkClick != null)
BOkClick(this, e);
}
private void showxwxx()//新闻管理模式的界面处理
{
Label1.Visible = false;
search_txt.Visible = true;
search_lx.Visible = true;
search_lx.Items.Clear();
ListItem myitem = new ListItem();
myitem.Text = "标题";
myitem.Value = "1";
search_lx.Items.Add(myitem);
myitem = new ListItem();
myitem.Text = "作者";
myitem.Value = "2";
search_lx.Items.Add(myitem);
search_lx.SelectedIndex = 0;
}
private void showuser()//操作员模式的界面处理
{
Label1.Visible = false;
search_txt.Visible = true;
search_lx.Visible = true;
search_lx.Items.Clear();
ListItem myitem = new ListItem();
myitem.Text="用户ID";
myitem.Value="1";
search_lx.Items.Add(myitem);
myitem = new ListItem();
myitem.Text = "用户名称";
myitem.Value = "2";
search_lx.Items.Add(myitem);
search_lx.SelectedIndex = 0;
}
private void showmin()//缺省模式的界面处理
{
Label1.Visible = true;
search_txt.Visible = true;
search_lx.Visible = false;
search_lx.Items.Clear();
}
}
}
/*用户控件代码结束*/
/*测试页界面开始*/
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="SearchBarTest.aspx.cs" Inherits="Control_SearchBarTest" %>
<%@ Register Src="SearchBar.ascx" TagName="SearchBar" TagPrefix="uc1" %>
<!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>无标题页</title>
<link href="../CSS/system.css" _fcksavedurl=""../CSS/system.css"" _fcksavedurl=""../CSS/system.css"" _fcksavedurl=""../CSS/system.css"" rel="stylesheet" type="text/css" />
<link href="../CSS/searchbar.css" rel="stylesheet" type="text/css" />
</head>
<body>
<form id="form1" runat="server">
<div>
<uc1:SearchBar ID="SearchBar1" runat="server" BarType="usertype" />
<asp:Label ID="Label1" runat="server" Text="查询结果"></asp:Label><br />
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="缺省" />
<asp:Button ID="Button2" runat="server" OnClick="Button2_Click" Text="操作员界面" />
<asp:Button ID="Button3" runat="server" OnClick="Button3_Click" Text="新闻管理界面" />
<asp:Button ID="Button4" runat="server" OnClick="Button4_Click" Text="隐藏下拉框" /></div>
<br />
</form>
</body>
</html>
/*测试页界面结束*/
/*测试页代码开始*/
using 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;
using MY.UC;
public partial class Control_SearchBarTest : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
#region web 窗体设计器生成的代码
override protected void OnInit(EventArgs e)
{
InitializeComponent();
base.OnInit(e);
}
private void InitializeComponent()
{
//注册查询条的按钮事件
this.SearchBar1.BOkClick += new BOkClickHandler(this.SearchBar1_BOkClick);
}
#endregion
protected void SearchBar1_BOkClick(object sender, EventArgs e)
{
//查询按钮事件
Label1.Text = "查询内容："+this.SearchBar1.SearchTxt +" 选择列表:"+ this.SearchBar1.SearchLX;
}
protected void Button1_Click(object sender, EventArgs e)
{
this.SearchBar1.BarType = EBarType.mintype;
}
protected void Button2_Click(object sender, EventArgs e)
{
this.SearchBar1.BarType = EBarType.usertype;
}
protected void Button3_Click(object sender, EventArgs e)
{
this.SearchBar1.BarType = EBarType.xwxxtype;
}
protected void Button4_Click(object sender, EventArgs e)
{
this.SearchBar1.LXVisible = false;
}
}
/*测试页代码结束*/