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The author:(作者)delv
published in(发表于) 2014/1/27 6:50:46
动态控件添加终极解决方案_[Asp.Net教程]

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>")]

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], true, true);
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" %>