1、通过页面隐藏域实现：view_state与隐藏控件 。
TextBox与DropDownList不一样？
2、通过内存实现：Catch、Session、Application ，Catch是个好咚咚(据说ASP.NET提供三种主要形式的缓存：页面级输出缓存、用户控件级输出缓存（或称为片段缓存）和缓存API，前两种没有用过)！
这三个是通过Page ParameterPage = (Page)System.Web.HttpContext.Current.Handler
3、硬盘文件数据库等
示例：
页面级缓存与用户控件缓存 <%@ OutputCache Duration="60" VaryByParam="*" %><%@ OutputCache Duration="60" VaryByParam="None" VaryByCustom="browser"%> Cache的应用（摘自MSDN）System.Web.Caching.Cache<%@ Import Namespace="System.IO"%> <html> <Script runat=server language="C#"> static bool itemRemoved = false; static CacheItemRemovedReason reason; CacheItemRemovedCallback onRemove = null;
public void RemovedCallback(String k, Object v, CacheItemRemovedReason r){
itemRemoved = true; reason = r;
} public void AddItemToCache(Object sender, EventArgs e) { itemRemoved = false; onRemove = new CacheItemRemovedCallback(this.RemovedCallback); if (Cache["Key1"] == null) Cache.Add("Key1", "Value 1", null, DateTime.Now.AddSeconds(60), TimeSpan.Zero, CacheItemPriority.High, onRemove); } public void RemoveItemFromCache(Object sender, EventArgs e) { if(Cache["Key1"] != null) Cache.Remove("Key1"); } </Script> <body> <Form runat="server"> <input type=submit OnServerClick="AddItemToCache" value="Add Item To Cache" runat="server"/> <input type=submit OnServerClick="RemoveItemFromCache" value="Remove Item From Cache" runat="server"/> </Form> <% if (itemRemoved) { Response.Write("RemovedCallback event raised."); Response.Write("<BR>"); Response.Write("Reason: <B>" + reason.ToString() + "</B>"); } else { Response.Write("Value of cache key: <B>" + Cache["Key1"] + "</B>"); } %> </body></html> ASPNET1.X动态加载<%@ Page language="c#" Codebehind="WebForm1.aspx.cs" AutoEventWireup="false" Inherits="WebApplication2.WebForm1" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" ><HTML> <HEAD> <title>WebForm1</title> <meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1"> <meta name="CODE_LANGUAGE" Content="C#"> <meta name="vs_defaultClientScript" content="JavaScript"> <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5"> </HEAD> <body MS_POSITIONING="GridLayout"> <form id="Form1" method="post" runat="server"> <asp:Button id="Button1" style="Z-INDEX: 101; LEFT: 48px; POSITION: absolute; TOP: 168px" runat="server" Text="Button"></asp:Button> </form> </body></HTML> using System;using System.Collections;using System.ComponentModel;using System.Data;using System.Drawing;using System.Web;using System.Web.SessionState;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.HtmlControls;namespace WebApplication2{
/// <summary> /// WebForm1 的摘要说明。
/// </summary> public class WebForm1 : System.Web.UI.Page { protected System.Web.UI.WebControls.Button Button1; //private const string BTNAME = "NEWBUTTON"; protected override void LoadViewState(object savedState) { if (savedState != null) { object[] myState = (object[])savedState; if (myState[0] != null) base.LoadViewState(myState[0]); if (myState[1] != null) { //将视图状态取出，动态加载Button，放入数值 ArrayList myBTState = (ArrayList)myState[1]; for(int i=0;i< myBTState.Count ;i++) { TextBox tbTextBox=new TextBox(); tbTextBox.Text = myBTState[i].ToString(); Page.Controls[1].Controls.Add(tbTextBox); } } } } protected override object SaveViewState() { object baseState = base.SaveViewState(); object[] allStates = new object[2]; allStates[0] = baseState; ArrayList ar = new ArrayList(); foreach(Control myControl in Page.Controls[1].Controls) { if(myControl is TextBox) { TextBox myTextBox = (TextBox)myControl; ar.Add(myTextBox.Text); } } allStates[1] = ar; return allStates; } private void Page_Load(object sender, System.EventArgs e) { }
Web 窗体设计器生成的代码 private void Button_Click(object sender, System.EventArgs e) { adduc(); } public void adduc() { TextBox t=new TextBox(); //t.ID=BTNAME; Page.Controls[1].Controls.Add(t); } } }
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