Designer exception

Question

User1297648701 posted

I have a User Control that has a custom property, which I want to set by a theme.
The custom property is used in javascript that is injected into the page by a
Page.ClientScript.RegisterStartupScript method in Page_Load.
Basically I do the following :

- Placed a [Themeable(true)] attribute above my user control class.
- I register my user control in web.config.

<pages styleSheetTheme="Sunset>
  <controls>
    <add tagPrefix="UC" src="~/UserControls/MyUserControl.ascx" tagName="MyUserControl">
  </controls>
</pages>

- Placed a skin file under Sunset directory in App_Themes with content :

<UC:MyUserControl runat="server" CustomColor="#FF0000" />

At runtime everything works fine, but in the designer I keep getting the error :

Error Rendering Control
An unhandled exception has occured.
There was an error parsing the theme: The control type "System.Web.UI.UserControl" cannot be themed.

What am I missing here ?

tia

Answer 1

User614805505 posted

Dear paperke67,

- Placed a [Themeable(true)] attribute above my user control class.

The above attribute should apply on properties.

Pls refer :

http://msdn.microsoft.com/en-us/magazine/cc163711.aspx

Answer 2

User-438128674 posted

I get the same error at design time after theming a UserControl and I don't think it has anything to do with the [Themeable(true)] attribute applied to the class. Here is a quote from msdn:

[AttributeUsageAttribute(AttributeTargets.Class|AttributeTargets.Property)]
public sealed class ThemeableAttribute : Attribute

 

Can anyone from Microsoft Team come back on it?