首先给一个常规的动态创建控件，并进行验证的代码
[前端aspx代码]
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Test.aspx.cs" Inherits="Test" %><!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></head><body> <form id="form1" runat="server"> <asp:Table ID="Table1" runat="server"> </asp:Table> <asp:Button ID="btnAddControl" runat="server" Text="动态创建控件" OnClick="btnAddControl_Click" /> <asp:Button ID="btnValidator" runat="server" Text="验证动态控件" Enabled="false" /> </form></body></html>
[后端Cs代码]
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 Test : System.Web.UI.Page{ private void Page_Load(object sender, System.EventArgs e) { } protected void btnAddControl_Click(object sender, EventArgs e) { TextBox _TxtBox = new TextBox();//动态创建一个TextBox _TxtBox.ID = "TextBox1"; RequiredFieldValidator _Require = new RequiredFieldValidator();//动态创建一个验证控件 _Require.ErrorMessage = "请输入"; _Require.SetFocusOnError = true; _Require.ControlToValidate = _TxtBox.ID; TableCell Cell = new TableCell(); Cell.Controls.Add(_TxtBox); Cell.Controls.Add(_Require);//将刚才创建的二个控件，加入Cell TableRow Row = new TableRow(); Row.Controls.Add(Cell); this.Table1.Rows.Add(Row); btnValidator.Enabled = true; }}
运行测试，点击"动态创建控件"后，再点击"验证动态控件",验证控件起作用了，一切正常
接下来，我们加入Ajax环境[加入UpdatePanel控件]，将前端代码改为:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Test.aspx.cs" Inherits="Test" %><!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></head><body> <form id="form1" runat="server"> <asp:ScriptManager ID="ScriptManager1" runat="server"> </asp:ScriptManager> <asp:UpdatePanel ID="UpdatePanel1" runat="server" > <ContentTemplate> <div style="border:solid 2px red"> <%--为突出显示，把UpdatePanel加了一个红色框--%> <asp:Table ID="Table1" runat="server"> </asp:Table> <asp:Button ID="btnAddControl" runat="server" Text="动态创建控件" OnClick="btnAddControl_Click" /> </div></ContentTemplate></asp:UpdatePanel> <asp:Button ID="btnValidator" runat="server" Text="验证动态控件" Enabled="true" /> </form></body></html>
再次运行，发现没办法再对动态生成的控件进行验证了(也就是说，新创建的验证控件没起作用) ,怎么办呢？难道就这样放弃？经过一番尝试，发现了一个很有趣的解决办法，具体参看以下代码:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Test.aspx.cs" Inherits="Test" %><!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></head><body> <form id="form1" runat="server"> <asp:ScriptManager ID="ScriptManager1" runat="server"> </asp:ScriptManager> <asp:UpdatePanel ID="UpdatePanel1" runat="server" > <ContentTemplate> <div style="border:solid 2px red"><%--为突出显示，把UpdatePanel加了一个红色框--%> <asp:Table ID="Table1" runat="server"> </asp:Table> <asp:Button ID="btnAddControl" runat="server" Text="动态创建控件" OnClick="btnAddControl_Click" /> </div></ContentTemplate></asp:UpdatePanel> <div style="display:none"> <asp:TextBox ID="_TxtNeverUsed" runat="server" Text="*"></asp:TextBox> <asp:RequiredFieldValidator ID="_RequireNeverUsed" runat="server" ErrorMessage="*" ControlToValidate="_TxtNeverUsed"></asp:RequiredFieldValidator> </div> <asp:Button ID="btnValidator" runat="server" Text="验证动态控件" Enabled="true" /> </form></body></html>
注意上面蓝色的代码，再次运行，哈哈，居然可以了！