Menu
I have a situation where I'm using some markup in 2 places on a page, one of which is in a repeater. The one in the repeater is not initializing its child controls; they're staying null.
Default.aspx:
<%@ Page Title="Home Page" Language="C#" AutoEventWireup="true"
CodeBehind="Default.aspx.cs" Inherits="nestedcontroltest._Default" %>
<%@ Register TagPrefix="a" Namespace="nestedcontroltest" Assembly="nestedcontroltest" %>
<html>
<head>
<title>test</title>
</head>
<body>
<asp:Repeater runat="server" ID="rptLetters" OnItemDataBound="rptLetters_ItemDataBound">
<ItemTemplate>
<a:MyControl runat="server" ID="ctrlMyControl"/>
</ItemTemplate>
</asp:Repeater>
</body>
</html>
Default.aspx.cs:
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
rptLetters.DataSource = new[] { "a", "b", "c" };
rptLetters.DataBind();
}
public void rptLetters_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
var ctrlMyControl = (MyControl)e.Item.FindControl("ctrlMyControl");
ctrlMyControl.Text = e.Item.DataItem.ToString();
}
}
MyControl.ascx:
<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="MyControl.ascx.cs" Inherits="nestedcontroltest.MyControl" %>
<asp:Panel runat="server" ID="pnlContent">
<asp:Literal runat="server" ID="ltlText"/>
</asp:Panel>
MyControl.ascx.cs:
public partial class MyControl : UserControl
{
public string Text { get; set; }
protected void Page_Load(object sender, EventArgs e)
{
ltlText.Text = Text;
}
}
When I try to load this, I get "Object reference not set to an instance of an object." - apparently ltlText is null.
How can I get my UserControl to initialize properly?
540
Found the answer:
In Default.aspx, I needed to register the control by name rather than by namespace.
<%@ Register TagPrefix="a" Namespace="nestedcontroltest" Assembly="nestedcontroltest" %>
Needs to be changed to
<%@ Register TagPrefix="a" TagName="MyControl" Src="~/MyControl.ascx" %>
And then the control gets initialized properly, even when it's in the repeater. Perhaps a bug in ASP.net, or perhaps I needed to use the full assembly name? Regardless, thanks for all your help guys.
63
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With