"Reference" User Control In Web.config?
Jul 7, 2010
I'm looking to create an instance of a user control programatically in a codebehind of a web site*. The only ways I've found to reference the class of the user control programatically have been:
Register the control in the web.config and drop the control on the page (works, but I don't want the control on the page as I want to dynamically add it). Add a <%@ Reference Control="Name.aspx"> to the aspx page at the top.
I would want to have any aspx page reference the control without having to put the <%@ Reference> declaration at the top of each page. I know I can "Register" controls in the web.config so I don't have to do that on every page, so I'm wondering if something similar exists for references. I'm almost certain I'm missing something about the whole registering/referencing concept, so perhaps just an explanation of what the best way to do this is in order.
*Web-site type project and not web application if this matters.
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Feb 17, 2011
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1 Aspx page
2. User control
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Jun 10, 2013
I have created a web user control. It contains a table that has several image buttons. I want them to behave link a tab control. Here's the souce view:
Code:
<%@ Control Language="VB" AutoEventWireup="false" CodeFile="ProcessMenuContrl.ascx.vb" Inherits="ProcessMenuContrl" %>
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[Code] ....
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Code:
<%@ Register src="ProcessMenuContrl.ascx" tagname="ProcessMenuContrl" tagprefix="uc1" %>
Here's portion of the source where you can see the control is placed under the MainContent of the page. :
Code:
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" Runat="Server">
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{
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<%@ Reference Control="~/CollectionRequest.ascx"%>
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Here is the contents of my test.ascx file:
<%@ Control Language="C#" AutoEventWireup="true" CodeFile="test.ascx.cs" Inherits="UserControls_test" %>
<p id="XXX">aaa</p>
and here is the contents of my test.ascx.cs file:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class UserControls_test : System.Web.UI.UserControl
{
protected void Page_Load(object sender, EventArgs e)
{
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}
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Usage :
[code]...
The problem is it gives me following error :
Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current web request. review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
Source Error:
Line 21: {
Line 22: base.OnInit(e);
Line 23: _ContentTemplate.InstantiateIn(BodyControlSpace);
Line 24: }
Line 25:
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[Code]....
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