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asp.net 动态管理（增加、删除、读取）控件

2010-08-21 22:12 477 查看

呵呵，废话少说了，上代码。

一、页面代码

<%@ 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 id="Head1" runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button ID="Button3" runat="server" Text="赋值" OnClick="Button3_Click" />
<asp:Button ID="Button2" runat="server" OnClick="Button2_Click" Text="取值" />
<table width="280px">
<tr>
<td>
<asp:Panel ID="Panel1" runat="server">
</asp:Panel>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
<asp:Button ID="Button1" runat="server" Text="添加" OnClick="Button1_Click" />
</td>
</tr>
</table>
</div>
</form>
</body>
</html>

二、后台代码

using System;
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;

public partial class test : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
ViewState["num"] = 3;
}

LoadCtrl(int.Parse(ViewState["num"].ToString()));
}

/// <summary>
/// 设置值
/// </summary>
private void SetTxtValue()
{
ViewState["num"] = 5;
LoadCtrl(int.Parse(ViewState["num"].ToString()));

for (int i = 0; i < 5; i++)
{
TextBox txt = Panel1.FindControl("txt" + i.ToString()) as TextBox;
txt.Text = i.ToString();
}
}

/// <summary>
/// 加载控件
/// </summary>
/// <param name="num"></param>
private void LoadCtrl(int num)
{
Panel1.Controls.Clear();

for (int i = 0; i < num; i++)
{
TextBox txt = new TextBox();
txt.ID = "txt" + i.ToString();
txt.Text = Request.Form[txt.ClientID];

LinkButton lbtn = new LinkButton();
lbtn.ID = "lbtn" + i.ToString();
lbtn.CommandArgument = i.ToString();
lbtn.Text = "删除";
lbtn.Click += new EventHandler(btnDel_Click);

Literal ltl = new Literal();
ltl.ID = "ltl" + i.ToString();
ltl.Text = "<br/>";

Panel1.Controls.Add(txt);
Panel1.Controls.Add(lbtn);
Panel1.Controls.Add(ltl);
}
}

/// <summary>
/// 删除
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void btnDel_Click(object sender, EventArgs e)
{
LinkButton lbtn = sender as LinkButton;
string id = lbtn.CommandArgument;
TextBox txt = Panel1.FindControl("txt" + id.ToString()) as TextBox;
Literal ltl = Panel1.FindControl("ltl" + id.ToString()) as Literal;

Panel1.Controls.Remove(txt);
Panel1.Controls.Remove(lbtn);
Panel1.Controls.Remove(ltl);
ViewState["num"] = int.Parse(ViewState["num"].ToString()) - 1;

SetControlsID();
}

/// <summary>
/// 添加
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void Button1_Click(object sender, EventArgs e)
{
ViewState["num"] = int.Parse(ViewState["num"].ToString()) + 1;
LoadCtrl(int.Parse(ViewState["num"].ToString()));
}

/// <summary>
/// 取值
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void Button2_Click(object sender, EventArgs e)
{
Label1.Text = string.Empty;

for (int i = 0; i < (int)ViewState["num"]; i++)
{
Label1.Text += ((TextBox)(Panel1.FindControl("txt" + i.ToString()))).Text;
}
}

/// <summary>
/// 重新设置控件ID
/// </summary>
private void SetControlsID()
{
int i = 0;

foreach (Control ctl in Panel1.Controls)
{
if (ctl.GetType().Name.ToLower() == "textbox")
{
ctl.ID = "txt" + i.ToString();
}
if (ctl.GetType().Name.ToLower() == "linkbutton")
{
ctl.ID = "lbtn" + i.ToString();
}
if (ctl.GetType().Name.ToLower() == "literal")
{
ctl.ID = "ltl" + i.ToString();

i++;
}
}
}

/// <summary>
/// 赋值
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void Button3_Click(object sender, EventArgs e)
{
SetTxtValue();

}
}

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