Why doesn't ASP.Net recognize my user control?

Question

In my current project (ASP.Net 2.0) I have a lot of web user controls, among them "Office.ascx".

Office.ascx is loaded into another controls using this line:

guide_controls_display_Office o = (guide_controls_display_Office)LoadControl("Office.ascx");

The control I am loading it into has Office.ascx registered using this line:

<%@ Register TagName="office" TagPrefix="uc" Src="Office.ascx" %>

But I get this error upon launching the web page:

Unable to cast object of type 'ASP.guide_controls_display_office_ascx' to type 'guide_controls_display_Office'.

Why do I get this message? I can see that the first type has "ASP." in front of it. Is that normal?

Community · Accepted Answer · 2017-05-23 12:07:08Z

1

It seems that this is a known problem. I had to clear temporary files and rebuild the project to make the error message go away, "for a while".

Unable to cast object of type 'X' to type 'X' - ASP.NET

The final solution seems to be interfaces. Build an interface or an abstract class with the methods you need, make your user control implement the interface, and then load the control using the interface/abstract class:

Control c = LoadControl("~/guide/controls/display/Office.ascx");
AOffice io = c as AOffice;
io.ID = "office_" + i.ToString();
offices.Controls.Add(io);

io.DisplayEdit = displayedit;

edited May 23, 2017 at 12:07

CommunityBot

11 silver badge

answered Aug 1, 2010 at 17:21

Erlend D.

3,0936 gold badges38 silver badges61 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Erlend D. Over a year ago

But is there a permanent soulution to this very annoying problem?

Collectives™ on Stack Overflow

Why doesn't ASP.Net recognize my user control?

1 Answer 1

1 Comment

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Linked

Related