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)
{
CustomWizardSte pHeader header = new CustomWizardSte pHeader();
header.ID = "CustomWizardSt epHeader";
ws.Controls.Add At(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.comwr ote in message
news:sO******** ********@TK2MSF TNGHUB02.phx.gb l...

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 "CustomWiza rd" 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.Componen tModel.Browsabl e(false)]
[System.Componen tModel.EditorBr owsable(System. ComponentModel. EditorBrowsable State.Never)]
[System.Componen tModel.Designer SerializationVi sibility(System .ComponentModel .DesignerSerial izationVisibili ty.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 PageControlType Converter<TCont rol: TypeConverter where
TControl : Control
{
// Overrides the CanConvertFrom method of TypeConverter.
// The ITypeDescriptor Context 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( ITypeDescriptor Context context,
Type sourceType)
{
if (sourceType == typeof(string))
{
return true;
}
return base.CanConvert From(context, sourceType);
}
// Overrides the ConvertFrom method of TypeConverter.
public override object ConvertFrom(ITy peDescriptorCon text context,
CultureInfo culture, object value)
{
if (value is string)
{
Page page = (Page)HttpConte xt.Current.Hand ler;
TControl c = page.FindContro l((string)value ) as TControl;
return c;
}
return base.ConvertFro m(context, culture, value);
}
// Overrides the ConvertTo method of TypeConverter.
public override object ConvertTo(IType DescriptorConte xt context,
CultureInfo culture, object value, Type destinationType )
{
if (destinationTyp e == typeof(string))
{
return ((TControl)valu e).ID;
}
return base.ConvertTo( context, culture, value, destinationType );
}
}
----------------
And adding this attribute to the child controls property:
[TypeConverter(t ypeof(PageContr olTypeConverter <CustomWizard>) )]

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

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