Hi,

Is it possible to use custom attributes on controls? For example,

If I have the following attribute defined

<AttributeUsage(AttributeTargets.All)> Public Class MyAttribute : Inherits Attribute
Public Message As String

Sub New(ByVal msg As String)
Message = msg
End Sub
End Class

I can "tag" a class with it: <MyAttribute("Hello")> Public Class MyPage : Inherits BasePage
And then in the debugger at run time I can see it using Instance.GetType().GetCustomAttributes(true). Howevr I can not see the attribute if i "tag" a control with it, such as; <MyAttribute("hello")> Protected WithEvents SectionHeader As XYZ.SalesApp.Controls.WebControls.TitleBar, I can not see the attribute.

Is there a reason for this, or a way to work around it?

Thanks

>Howevr I can not see the attribute if i "tag" a control with it, such as; <MyAttribute("hello")> Protected WithEvents SectionHeader As XYZ.SalesApp.Controls.WebControls.TitleBar, I can not see the attribute.


Where are you looking for it?



Mattias

--
Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.

At runtime -- I check in the debugger for
SectionHeader.GetType().GetCustomAttributes(True) and it is not there.

Thanks
Joe

"Mattias Sjögren" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
>
>>Howevr I can not see the attribute if i "tag" a control with it, such as;
>><MyAttribute("hello")> Protected WithEvents SectionHeader As
>>XYZ.SalesApp.Controls.WebControls.TitleBar, I can not see the attribute.
>
>
> Where are you looking for it?
>
>
>
> Mattias
>
> --
> Mattias Sjögren [MVP] mattias @ mvps.org
> http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
> Please reply only to the newsgroup.

That code is not tagging a control, it's tagging a field inside another
object. GetType is returning the control's type, which does not have an
attribute on it. Consider the following:

<FirstAttribute("Hello")> Public Class MyControl
End Class

Public Class MyContainer
<SecondAttribute("Hello2")> Protected WithEvents SectionHeader As
TitleBar
End Class

Now, if you used SectionHeader.GetType().GetCustomAttributes(True), it would
return FirstAttribute, not SecondAttribute, since FirstAttribute is defined
on the MyControl type. If, however you got a FieldInfo object pointing to
the SectionHeader field inside the MyContainerType, it's GetCustomAttributes
would return SecondAttribute.

"WFB" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> At runtime -- I check in the debugger for
> SectionHeader.GetType().GetCustomAttributes(True) and it is not there.
>
> Thanks
> Joe
>
> "Mattias Sjögren" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed)...
>>
>>>Howevr I can not see the attribute if i "tag" a control with it, such as;
>>><MyAttribute("hello")> Protected WithEvents SectionHeader As
>>>XYZ.SalesApp.Controls.WebControls.TitleBar, I can not see the attribute.
>>
>>
>> Where are you looking for it?
>>
>>
>>
>> Mattias
>>
>> --
>> Mattias Sjögren [MVP] mattias @ mvps.org
>> http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
>> Please reply only to the newsgroup.
>
>

Sean,

Im not sure I follow. If I have

Public Class MyClass
<MyCustomattribute()> Protected WithEvents Ctrl as MyLibrary.MyControl

Sub New()
Dim s as String
End Sub

End Class

Then (in the bebugger) during the constructor try Me.GetType().GetFields(),
no results are returned. Can you let me know what Im doing wrong?

Thanks a lot for your help.

Joe

"Sean Hederman" <(E-Mail Removed)> wrote in message
news:cuvqah$gc4$(E-Mail Removed)...
> That code is not tagging a control, it's tagging a field inside another
> object. GetType is returning the control's type, which does not have an
> attribute on it. Consider the following:
>
> <FirstAttribute("Hello")> Public Class MyControl
> End Class
>
> Public Class MyContainer
> <SecondAttribute("Hello2")> Protected WithEvents SectionHeader As
> TitleBar
> End Class
>
> Now, if you used SectionHeader.GetType().GetCustomAttributes(True), it
> would return FirstAttribute, not SecondAttribute, since FirstAttribute is
> defined on the MyControl type. If, however you got a FieldInfo object
> pointing to the SectionHeader field inside the MyContainerType, it's
> GetCustomAttributes would return SecondAttribute.
>
> "WFB" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed)...
>> At runtime -- I check in the debugger for
>> SectionHeader.GetType().GetCustomAttributes(True) and it is not there.
>>
>> Thanks
>> Joe
>>
>> "Mattias Sjögren" <(E-Mail Removed)> wrote in message
>> news:(E-Mail Removed)...
>>>
>>>>Howevr I can not see the attribute if i "tag" a control with it, such
>>>>as; <MyAttribute("hello")> Protected WithEvents SectionHeader As
>>>>XYZ.SalesApp.Controls.WebControls.TitleBar, I can not see the attribute.
>>>
>>>
>>> Where are you looking for it?
>>>
>>>
>>>
>>> Mattias
>>>
>>> --
>>> Mattias Sjögren [MVP] mattias @ mvps.org
>>> http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
>>> Please reply only to the newsgroup.
>>
>>
>
>

GetFields with no parameters will not return a protected field. Use:
Me.GetType().GetFields(BindingFlags.GetField Or BindingFlags.Instance Or
BindingFlags.NonPublic)

"WFB" <(E-Mail Removed)> wrote in message
news:%(E-Mail Removed)...
> Sean,
>
> Im not sure I follow. If I have
>
> Public Class MyClass
> <MyCustomattribute()> Protected WithEvents Ctrl as MyLibrary.MyControl
>
> Sub New()
> Dim s as String
> End Sub
>
> End Class
>
> Then (in the bebugger) during the constructor try
> Me.GetType().GetFields(), no results are returned. Can you let me know
> what Im doing wrong?
>
> Thanks a lot for your help.
>
> Joe
>
> "Sean Hederman" <(E-Mail Removed)> wrote in message
> news:cuvqah$gc4$(E-Mail Removed)...
>> That code is not tagging a control, it's tagging a field inside another
>> object. GetType is returning the control's type, which does not have an
>> attribute on it. Consider the following:
>>
>> <FirstAttribute("Hello")> Public Class MyControl
>> End Class
>>
>> Public Class MyContainer
>> <SecondAttribute("Hello2")> Protected WithEvents SectionHeader As
>> TitleBar
>> End Class
>>
>> Now, if you used SectionHeader.GetType().GetCustomAttributes(True), it
>> would return FirstAttribute, not SecondAttribute, since FirstAttribute is
>> defined on the MyControl type. If, however you got a FieldInfo object
>> pointing to the SectionHeader field inside the MyContainerType, it's
>> GetCustomAttributes would return SecondAttribute.
>>
>> "WFB" <(E-Mail Removed)> wrote in message
>> news:(E-Mail Removed)...
>>> At runtime -- I check in the debugger for
>>> SectionHeader.GetType().GetCustomAttributes(True) and it is not there.
>>>
>>> Thanks
>>> Joe
>>>
>>> "Mattias Sjögren" <(E-Mail Removed)> wrote in message
>>> news:(E-Mail Removed)...
>>>>
>>>>>Howevr I can not see the attribute if i "tag" a control with it, such
>>>>>as; <MyAttribute("hello")> Protected WithEvents SectionHeader As
>>>>>XYZ.SalesApp.Controls.WebControls.TitleBar, I can not see the
>>>>>attribute.
>>>>
>>>>
>>>> Where are you looking for it?
>>>>
>>>>
>>>>
>>>> Mattias
>>>>
>>>> --
>>>> Mattias Sjögren [MVP] mattias @ mvps.org
>>>> http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
>>>> Please reply only to the newsgroup.
>>>
>>>
>>
>>
>
>