如何创建和使用自定义的控制与UpdatePanel中添加到页面编程 [英] How to create and use custom control with UpdatePanel added to the page programmatically

问题描述

我有简单的Web用户控件（code我在网上找到的地方）：

I have simple web user control (the code I found somewhere in the web):

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="WebUserControl1.ascx.cs"
Inherits="ARP.DynamicsCRM2011.MagicWebForm.WebUserControl1" %>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
    <asp:CheckBox ID="CheckBox1" runat="server" AutoPostBack="True" OnCheckedChanged="CheckBox1_CheckedChanged"
        Text="Checkbox" />
    <asp:Button ID="Button1" runat="server" Text="Button" Visible="False" OnClick="Button1_Click" />
    <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
</ContentTemplate>
</asp:UpdatePanel>

protected void Page_Load(object sender, EventArgs e)
{

}

protected void CheckBox1_CheckedChanged(object sender, EventArgs e)
{
    Button1.Visible = CheckBox1.Checked;
}

protected void Button1_Click(object sender, EventArgs e)
{
    Label1.Text = DateTime.Now.ToString();
}

现在我要将此控件添加到我的网页（以编程方式的onLoadComplete事件）：

Now I want to add this control to my page (programmatically in OnLoadComplete event):

<%@ Reference Control="~/WebUserControl1.ascx" %>

WebUserControl1 myControl = (WebUserControl1)Page.LoadControl("~/WebUserControl1.ascx");
myControl.ID = "myControl_" + some_name;
parentControl.Controls.Add(myControl);

当然，我有SriptManager在页面上，我控制的正确添加。我知道以编程方式添加控件必须每次页面加载时重新创建。不幸的是这将导致创建新的控制，因此检查复选框不工作 - 检查它的onLoadComplete的（页面）再次发射，并创建新的控制之后。如果我省略则不显示任何内容。所以，问题是 - 如何做到这一点。

Of course I have SriptManager on the page and my control is added properly. I know that programmatically added controls must be recreated every time the page is loaded. Unfortunately this causes creating new control, so checking checkbox doesn't work - after checking it the OnLoadComplete (of the page) is fired again and new control is created. If I omit that then nothing is displayed. So the question is - how to do this?

推荐答案

动态控制应重新添加到控制树在preINIT ，看文档：

Dynamic control should be re-added to the control tree OnPreInit, see documentation:

preINIT - 创建或重新创建动态控件

PreInit - Create or re-create dynamic controls.

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