知识大全 .net Web用户控件使用技巧

Posted 2022-07-17 知

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　　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 %>

　　</asp:DropDownList> <asp:Button ID= BOk runat= server CssClass= Button Text= 查询 OnClick= BOk_Click /> <asp:Label ID= Label 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 = usertype xwxxtype ; // =缺省模式 =操作员模式 =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 = ; 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 Label Visible = false; search_txt Visible = true; search_lx Visible = true; search_lx Items Clear(); ListItem myitem = new ListItem(); myitem Text = 标题 ; myitem Value = ; search_lx Items Add(myitem); myitem = new ListItem(); myitem Text = 作者 ; myitem Value = ; search_lx Items Add(myitem); search_lx SelectedIndex = ; private void showuser()//操作员模式的界面处理 Label 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= ; search_lx Items Add(myitem); myitem = new ListItem(); myitem Text = 用户名称 ; myitem Value = ; search_lx Items Add(myitem); search_lx SelectedIndex = ;

　　private void showmin()//缺省模式的界面处理 Label 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= uc %>

　　<!DOCTYPE PUBLIC //W C//DTD XHTML Transitional//EN transitional dtd >

　　< xmlns= ><head runat= server > <title>无标题页</title> <link _fcksavedurl= /CSS/system css _fcksavedurl= /CSS/system css _fcksavedurl= /CSS/system css rel= stylesheet type= text/css /> <link rel= stylesheet type= text/css /> </head><body> <form id= form runat= server > <div> <uc :SearchBar ID= SearchBar runat= server BarType= usertype /> <asp:Label ID= Label runat= server Text= 查询结果 ></asp:Label><br /> <asp:Button ID= Button runat= server OnClick= Button _Click Text= 缺省 /> <asp:Button ID= Button runat= server OnClick= Button _Click Text= 操作员界面 /> <asp:Button ID= Button runat= server OnClick= Button _Click Text= 新闻管理界面 /> <asp:Button ID= Button runat= server OnClick= Button _Click Text= 隐藏下拉框 /></div> <br /> </form></body></>/*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 SearchBar BOkClick += new BOkClickHandler(this SearchBar _BOkClick);

　　 #endregion

　　protected void SearchBar _BOkClick(object sender EventArgs e) //查询按钮事件 Label Text = 查询内容 +this SearchBar SearchTxt + 选择列表: + this SearchBar SearchLX;

　　 protected void Button _Click(object sender EventArgs e) this SearchBar BarType = EBarType mintype;

　　protected void Button _Click(object sender EventArgs e) this SearchBar BarType = EBarType usertype;

　　protected void Button _Click(object sender EventArgs e) this SearchBar BarType = EBarType xwxxtype;

　　protected void Button _Click(object sender EventArgs e) this SearchBar LXVisible = false;

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