经常用到使用PlaceHolder加载web用户控件,遍历控件取值就用到了。下面这个方法是遍历所有控件,可以遍历某一类控件(源码是查找所有checkbox控件),遍历所有类型控件,修改一下即可
using System;using System.Collections;using System.Collections.Generic;using System.Configuration;using System.Data;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.HtmlControls;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;namespace SantGo.Bunli.Web{ public partial class Site1 : System.Web.UI.MasterPage { protected void Page_Load( object sender, EventArgs e ) { if( !IsPostBack ) { ListcheckBoxList = new List (); FindSubControls( ContentPlaceHolder1, checkBoxList, new ControlMatchHander( CheckBoxMatchFunc ) ); foreach ( CheckBox checkBox in checkBoxList ) { divDebug.InnerHtml += string.Format( "{0}, {1} ", checkBox.ID, checkBox.ClientID ); } } } protected delegate bool ControlMatchHander( Control control ); protected void FindSubControls( Control control, IList saveCollection, ControlMatchHander matchFunc ) { if ( control.HasControls() ) { foreach ( Control subControl in control.Controls ) { FindSubControls( subControl, saveCollection, matchFunc ); } } else { if ( matchFunc( control ) ) { saveCollection.Add( control ); } } } protected bool CheckBoxMatchFunc( Control control ) { return control is CheckBox; } }}
顺便举个例子说一下placeholder的用法。
第一步加载放置placeholder控件
第二步加载自定义web控件,记住这个加载一定要放到if (!IsPostBack)的外面,否在在回传的时候 你讲取不到placeholder中的控件。
if (System.IO.File.Exists(Server.MapPath("test.ascx"))) ph.Controls.Add(LoadControl("test.ascx"));
第三步,遍历控件取值
//用上面的方法取控件,然后将取值第四步over