ASP.NET动态添加控件代码,Asp.Net代码库,德仔网

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【Asp.Net】 ASP.NET动态添加控件

作者: / 发布于2011/3/15/ 487

1.aspx页面<%Page%>里必须添加EnableViewState="true",
使动态添加的控件状态可保存
2.动态添加的控件最好放在容器上(这里用Panel这个容器)
3.必须设置动态控件的ID,否则获取不到该控件

建议:运用Asp.net Ajax会有更好的用户体验效果

<div>
例子: 
test2.aspx: 
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Test2.aspx.cs" 
Inherits="Test2" Title="Untitled Page" EnableViewState="true" %> 
 <asp:Panel ID="Panel2" runat="server" Height="50px" Width="446px"> 
 <asp:Label ID="Label1" runat="server" Text="Name1:"></asp:Label> 
 <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox> 
 <asp:Label ID="Label2" runat="server" Text="Address1:"></asp:Label> 
 <asp:TextBox ID="TextBox2" runat="server" Width="149px"></asp:TextBox> 
 </asp:Panel> 
 <asp:Button ID="btnAddAjax" runat="server" Text="Add" OnClick="btnAddAjax_Click" /> 
<asp:Button id="btnShow" onclick="btnShow_Click" runat="server" Text="Show" /> 
<asp:Label id="lblMsg" runat="server">No Value</asp:Label> 
 
 
 
test2.aspx.cs 
 
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 partial class Test2 : System.Web.UI.Page 
{ 
 protected void Page_Load(object sender, EventArgs e) 
 { 
 
 if(ViewState["txtName2"] != null && (bool)ViewState["txtName2"]) 
 { 
 CreateMyControls(); 
 } 
 
 
 } 
 
 protected void btnAddAjax_Click(object sender, EventArgs e) 
 { 
 CreateMyControls(); 
 } 
 protected void btnShow_Click(object sender, EventArgs e) 
 { 
 if(ViewState["txtName2"]!=null) 
 { 
 TextBox txtName2 = Panel2.FindControl("txtName2") as TextBox; 
 if(txtName2 != null) 
 lblMsg.Text = "Name2= " + txtName2.Text; 
 } 
 
 if(ViewState["txtAddr2"]!=null) 
 { 
 TextBox txtAddr2 = Panel2.FindControl("txtAddr2") as TextBox; 
 if(txtAddr2 != null) 
 lblMsg.Text += " Addr2= " + txtAddr2.Text; 
 } 
 
 
 } 
 
 private void CreateMyControls() 
 { 
 Label lblName2 = new Label(); 
 lblName2.Text = "Name2:"; 
 
 TextBox txtName2 = new TextBox(); 
 //设置ID,否则不能获取到值 
 txtName2.ID = "txtName2"; 
 //可视状态,否则PostBack后动态添加的控件会不见 
 ViewState["txtName2"]= true; 
 
 Label lblAddr2 = new Label(); 
 lblAddr2.Text = "Addr2:";
</div>

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