Error creating control: ID property is not specified

[Allan Ebdrup]

I get the error "Error creating control: ID property is not specified" when
I view my custom web control in design view.
I add the control that gives an error in OnInit like this:
-----
foreach (WizardStep ws in WizardSteps)
{
CustomWizardStepHeader header = new CustomWizardStepHeader();
header.ID = "CustomWizardStepHeader";
ws.Controls.AddAt(0, header);
}
-----
So I have specified the ID, why do I get the error then?

Kind Regards,
Allan Ebdrup

[Allan Ebdrup]

"Walter Wang [MSFT]" <wa****@online.microsoft.comwrote in message
news:sO****************@TK2MSFTNGHUB02.phx.gbl...

Hi Allan,

Is your custom web control a User Control or a Server Control? I assume
you're creating a custom Server Control which inherits from the Wizard
control.

Yes it's a server control.

When you use this customer Server Control on a Web Form, you will
also need to assign the ID property for it. For example:

<snip>

There is an ID assigned to the tag, and everything runs fine when I run the
page, the problem only occurs in design view.
I've added IDs to all the controls that are generated programatically and
now I get a different error (again only in design view not when I run the
page)
On the Child Control I've added a "CustomWizard" property in whitch I set
the Wizard control that the Child is a Child of (the header knows what
wizard it's part of).
Now I get the following error in design view:

"Cannot create an object of type 'CustomWizard' from its string
representation 'CustomWizard1' for the CustomWizard Property."

I guess it's because of some kind of serialization or something so I've
added the following attributes to tha CustomWizard property in the child
control:

[System.ComponentModel.Browsable(false)]
[System.ComponentModel.EditorBrowsable(System.Compo nentModel.EditorBrowsableState.Never)]
[System.ComponentModel.DesignerSerializationVisibil ity(System.ComponentModel.DesignerSerializationVis ibility.Hidden)]

But that didn't solve the problem.

Can't you add properties to controls and only use them programatically? What
am I missing?

Kind Regards,
Allan Ebdrup
--
Try a beta of my free Survey solution that makes heavy use of AJAX at
http://obsurvey.com, feedback is very welcome.

[Allan Ebdrup]

I've tried adding a typeconverter:
----------------
public class PageControlTypeConverter<TControl: TypeConverter where
TControl : Control
{
// Overrides the CanConvertFrom method of TypeConverter.
// The ITypeDescriptorContext interface provides the context for the
// conversion. Typically, this interface is used at design time to
// provide information about the design-time container.
public override bool CanConvertFrom(ITypeDescriptorContext context,
Type sourceType)
{
if (sourceType == typeof(string))
{
return true;
}
return base.CanConvertFrom(context, sourceType);
}
// Overrides the ConvertFrom method of TypeConverter.
public override object ConvertFrom(ITypeDescriptorContext context,
CultureInfo culture, object value)
{
if (value is string)
{
Page page = (Page)HttpContext.Current.Handler;
TControl c = page.FindControl((string)value) as TControl;
return c;
}
return base.ConvertFrom(context, culture, value);
}
// Overrides the ConvertTo method of TypeConverter.
public override object ConvertTo(ITypeDescriptorContext context,
CultureInfo culture, object value, Type destinationType)
{
if (destinationType == typeof(string))
{
return ((TControl)value).ID;
}
return base.ConvertTo(context, culture, value, destinationType);
}
}
----------------
And adding this attribute to the child controls property:
[TypeConverter(typeof(PageControlTypeConverter<Cust omWizard>))]

But I still get the same error in design view...

[Walter Wang [MSFT]]

Hi Allan,

I'm not sure if this is caused by the TypeConverter or not. I cannot tell
clearly what might be the cause without reproducing the issue on my side
and see the detailed error messages. Could you please create a reproducible
project and send it to me? Thank you for the trouble.
Regards,
Walter Wang (wa****@online.microsoft.com, remove 'online.')
Microsoft Online Community Support

==================================================
When responding to posts, please "Reply to Group" via your newsreader so
that others may learn and benefit from your issue.
==================================================

This posting is provided "AS IS" with no warranties, and confers no rights.