Repeater中使用PlaceHolder触发ItemCommand事件有关问题

Repeater中使用PlaceHolder触发ItemCommand事件问题
在Repeater中通过PlaceHolder动态添加的Button，点击之后不会触发ItemCommand事件。怎么样才能让placeHolder中添加的button也能触发ItemCommand事件？

aspx代码：

C# code

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApplication1.WebForm1" %>

<!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></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Repeater ID="Repeater1" runat="server">
        <ItemTemplate>
            <div>
            <%# Eval("ID") %>，<%# Eval("Name") %>，
            <asp:Button ID="btnAdd" runat="server" Text="Add" CommandName="add" CommandArgument='<%# Eval("ID") %>' />
                <asp:PlaceHolder ID="PlaceHolder1" runat="server" ViewStateMode="Enabled"></asp:PlaceHolder>
            </div>
        </ItemTemplate>
        </asp:Repeater>
    </div>
    </form>
</body>
</html>

CS代码：

C# code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace WebApplication1
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            Repeater1.ItemCommand += new RepeaterCommandEventHandler(Repeater1_ItemCommand);

            if (!IsPostBack)
            {
                List<Entity> list = new List<Entity>() { 
                    new Entity() { ID = 1, Name = "aaa"},
                    new Entity() { ID = 1, Name = "bbb" },
                    new Entity() { ID = 1, Name = "bbb" }
                };

                Repeater1.ItemDataBound += new RepeaterItemEventHandler(Repeater1_ItemDataBound);
                Repeater1.DataSource = list;
                Repeater1.DataBind();
            }
        }

        protected override void OnInit(EventArgs e)
        {
            base.OnInit(e);                
        }


        protected void Repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e)
        {
            if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
            {
                Entity entity = (Entity)e.Item.DataItem;
                PlaceHolder PlaceHolder1 = (PlaceHolder)e.Item.FindControl("PlaceHolder1");
                Button btnCancel = new Button();
                btnCancel.ID = "btnCancel" + entity.ID;
                btnCancel.CommandName = "cancel";
                btnCancel.CommandArgument = entity.ID.ToString();
                btnCancel.Text = "Cancel " + entity.Name;
                PlaceHolder1.Controls.Add(btnCancel);
            }
        }

        public class Entity
        {
            public int ID { get; set; }
            public string Name { get; set; }
        }

        protected void Repeater1_ItemCommand(object source, RepeaterCommandEventArgs e)
        {
            Response.Write(e.CommandName);
        }
    }
}

------解决方案--------------------
那些事件和控件最好在前台写。干嘛非得写在后台?
------解决方案--------------------
一般是不建议在 Page_Init中作数据的绑定的

Repeater中使用PlaceHolder触发ItemCommand事件有关问题

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