动态控件添加终极解决方案

动态控件添加解决方案

你可能因为动态添加的控件回传消失而苦烦过吧。
你可能因为动态添加的控件内部事件无法执行而烦过吧。
开始吧。
解决的动态控件添加问题.

 

做了一个示例:

新建一个类:class1.cs

 

我在csdn博客上,发现了这个控件。
using System.Web.UI.Design;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;
using System.Xml;
using System.Collections;
using System.Web;
using System;
namespace cn.co
{


    [ToolboxData(
"<{0}:DynamicControlsPanel runat=server></{0}:DynamicControlsPanel>")]

    
public class DynamicControlsPanel : Panel
    {
        
#region 自定义的属性


        [DefaultValue(HandleDynamicControls.DontPersist)]
        
public HandleDynamicControls ControlsWithoutIDs
        {
            
get
            {
                
if (ViewState["ControlsWithoutIDs"== null)
                    
return HandleDynamicControls.DontPersist;
                
else
                    
return (HandleDynamicControls)ViewState["ControlsWithoutIDs"];
            }
            
set { ViewState["ControlsWithoutIDs"= value; }
        }

        
#endregion 自定义的属性

        
#region 视图状态管理

        
protected override void LoadViewState(object savedState)
        {
            
object[] viewState = (object[])savedState;

            Pair persistInfo 
= (Pair)viewState[0];
            
foreach (Pair pair in (ArrayList)persistInfo.Second)
            {
                RestoreChildStructure(pair, 
this);
            }

            
base.LoadViewState(viewState[1]);
        }

        
protected override object SaveViewState()
        {

            
if (HttpContext.Current == null)
                
return null;

            
object[] viewState = new object[2];
            viewState[
0= PersistChildStructure(this"C");
            viewState[
1= base.SaveViewState();
            
return viewState;
        }

        
private void RestoreChildStructure(Pair persistInfo, Control parent)
        {
            Control control;

            
string[] persistedString = persistInfo.First.ToString().Split(';');

            
string[] typeName = persistedString[1].Split(':');
            
switch (typeName[0])
            {

                
case "C":
                    Type type 
= Type.GetType(typeName[1], truetrue);
                    
try
                    {
                        control 
= (Control)Activator.CreateInstance(type);
                    }
                    
catch (Exception e)
                    {
                        
throw new ArgumentException(String.Format("类型 '{0}' 不能恢复状态", type.

                  ToString()), e);
                    }
                    
break;
                
default:
                    
throw new ArgumentException("无法识别的类型.不能恢复状态.");
            }

            control.ID 
= persistedString[2];

            
switch (persistedString[0])
            {
                
case "C":
                    parent.Controls.Add(control);
                    
break;
            }

            
foreach (Pair pair in (ArrayList)persistInfo.Second)
            {
                RestoreChildStructure(pair, control);
            }
        }

        
private Pair PersistChildStructure(Control control, string controlCollectionName)
        {
            
string typeName;
            ArrayList childPersistInfo 
= new ArrayList();

            
if (control.ID == null)
            {
                
if (ControlsWithoutIDs == HandleDynamicControls.ThrowException)
                    
throw new NotSupportedException("你必须设置你的ID");
                
else if (ControlsWithoutIDs == HandleDynamicControls.DontPersist)
                    
return null;
            }

            typeName 
= "C:" + control.GetType().AssemblyQualifiedName;

            
string persistedString = controlCollectionName + ";" + typeName + ";" + control.ID;

            
if (!(control is UserControl) && !(control is CheckBoxList))
            {
                
for (int counter = 0; counter < control.Controls.Count; counter++)
                {
                    Control child 
= control.Controls[counter];
                    Pair pair 
= PersistChildStructure(child, "C");
                    
if (pair != null)
                        childPersistInfo.Add(pair);
                }
            }

            
return new Pair(persistedString, childPersistInfo);
        }
        
#endregion 视图状态管理

        
#region 重化控件样式
        
protected override void Render(System.Web.UI.HtmlTextWriter writer)
        {
            
base.Render(writer);
        }
        
//  
        #endregion 重化控件样式
    }

    
public enum HandleDynamicControls
    {
        DontPersist,
        Persist,
        ThrowException
    }
}

 


default7.aspx页面代码

 

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default7.aspx.cs" Inherits="Default7" %>

 

 

<%@ Register Namespace="cn.co" TagPrefix="tt" %>

<!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">
    
<div>
        
<asp:RadioButtonList ID="RadioButtonList1" runat="server" AutoPostBack="True" OnSelectedIndexChanged="RadioButtonList1_SelectedIndexChanged">
            
<asp:ListItem>0</asp:ListItem>
            
<asp:ListItem>1</asp:ListItem>
        
</asp:RadioButtonList>
        
        
<tt:DynamicControlsPanel  ControlsWithoutIDs=Persist runat=server ID="pan"></tt:DynamicControlsPanel>
  
</div>

        

    
</form>
</body>
</html>

 

 

default7.aspx.cs页面


 

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 Default7 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
 
    protected void RadioButtonList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        switch (this.RadioButtonList1.SelectedValue)
        {    
      case "0": 
                Control con=Page.LoadControl("0.ascx");
            con.ID = "dd";
                this.pan.Controls.Clear();
                this.pan.Controls.Add(con);
                
                break;

          case "1": Control con1 = Page.LoadControl("1.ascx");
            con1.ID = "ddd";
                this.pan.Controls.Clear();
                this.pan.Controls.Add(con1);
                break;
        }
    }
}


 

还有两个o.ascx,1.ascs页面。
代码分别为
0.ascx
前台

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="0.ascx.cs" Inherits="_0" %>
0控件。
<br />
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="0控件" />

后台

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 _0 : System.Web.UI.UserControl
{
    
protected void Page_Load(object sender, EventArgs e)
    {

    }
    
protected void Button1_Click(object sender, EventArgs e)
    {
        Response.Write(
"0控件");
    }
}

1.ascx
前台
<%@ Control Language="C#" AutoEventWireup="true" CodeFile="1.ascx.cs" Inherits="_1" %>
1控件。
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="1控件" />
后台:
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 _1 : System.Web.UI.UserControl
{
    
protected void Page_Load(object sender, EventArgs e)
    {

    }
    
protected void Button1_Click(object sender, EventArgs e)
    {
        Response.Write(
"1控件");
    }
}


测试结果如图:
打开的页面:

 
 
当我的点击时:

 

 
当我们刷新时
 
结果还是
 


-------->
瑞气生辉(suiqirui19872005[坐断江南,笑煞之])写于:上午 10:53:32

posted @ 2007-10-11 12:48  过河卒A  阅读(3780)  评论(7编辑  收藏  举报