custom container control - wrapping child controls

  • Thread starter Thread starter gerry
  • Start date Start date
G

gerry

I am trying to create a custom container control that will only ever contain
a specific type of control.
At design time, when a control of a different type is added to the container
I would like to wrap the control in the proper control type - which is also
a container.

At design time I want to be able to turn this :

<my:container>
<asp:textbox />
</my:container>

into this :

<my:container>
<my:wrapper>
<asp:textbox />
</my:wrapper>
</my:container>

It is no problem to detect what type of object is being added to the control
and I can do the wrapping easy enough for the rendered control , but I can't
see how to change the physical markup as displayed in the designer and
stored in the .aspx file.

Webparts does something similar but it looks like the designer source has
not been made available.

Anyone know how to do this or have any ideas on how this might be done ?

Gerry
 
Hi Gerry,

From your description, you're developing a custom server control which
contains some inner controls, and you want to make some certain kind of
nested subcontrols be wrapper with another control automatically at
design-time, correct?

I've performed some research on this. So far for nested controls, the
custom control itself should be set as "ParseChildren" as false so that
inner markup will be interpreted as control instances. I think you've also
ready done this, correct? Generally, for design-time custoimzation, we
have two tools:

1. A custom control designer

2. A custom control parser

So far I only got some interfaces for customzing the displaying html from
Control Designer , but not the inline markup of the control. Also,
controlbuilder seems focus on the nested control's parsing and population
at runtime. Is there are any particular requirement in your page or
control that it will need such an wrapper element? Maybe we can also look
for some other means on this.

I'll do some further research on this and inform you if I get any new
finding.

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead


Delighting our customers is our #1 priority. We welcome your comments and
suggestions about how we can improve the support we provide to you. Please
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--------------------
 
Hi Gerry,

How are you doing?

Regarding on this issue, I've performed some further research and discussed
with some other ASP.NET engineers.

So far we can think of one way to achieve this, but I think it is total
overkill. Whenever your template is persisted (when GetPersistenceContent()
is called), you could examine your control tree and modify it to make sure
it contains the container controls. You could then persist that control
tree into text, then re-parse it into an ITemplate and set your property to
that value. Then when ASP.NET persists your template it'll persist the
modified template.

Some scenarios that are a bit similar to this are that the MultiView
control can only contain View controls. Similarly, WebPartZones can only
contain WebParts. You might want to dig into their designer and runtime
code to see how they handle this. I've used the reflector tool to inspect
the code abit and find some code logic for gettting the current inner
content of control. But may still need more effort on setting the content.

Have you got any progress on your side?

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead


Delighting our customers is our #1 priority. We welcome your comments and
suggestions about how we can improve the support we provide to you. Please
feel free to let my manager know what you think of the level of service
provided. You can send feedback directly to my manager at:
(e-mail address removed).

==================================================
Get notification to my posts through email? Please refer to
http://msdn.microsoft.com/subscriptions/managednewsgroups/default.aspx#notif
ications.


==================================================
This posting is provided "AS IS" with no warranties, and confers no rights.
--------------------
Content-Transfer-Encoding: 7bit
From: (e-mail address removed) (Steven Cheng [MSFT])
Organization: Microsoft
Date: Thu, 24 Jul 2008 07:43:56 GMT
Subject: RE: custom container control - wrapping child controls
Click to expand...
 
thanks steven,

I gave up on this for now - I just made it a requirement that the user must
manually wrap the controls - along with a few other manual design time
issues.

I went the same route using reflector trying to trace through how webparts
do it and even how list controls convert an edited list into embedded html
but it didn't help much.

If System.Design.pdb had been included in the framework source distro I
think tracing through the process in the debugger would have helped
immensely - but for whatever reason this was not included. I even tried
recompiling System.Design.dll as exported from reflector - but it appears
that reflector has some issues with its output that would make this a pretty
daunting if not impossible task - the biggest problem being the generated
code calling methods on objects in other assemblies marked as internal. IMO
the framework contains WAY too many internal elements especially trivial
elements - but I digress.

I will dig into this again at a later time - with the extolling of vs
extensibility I would have expected all of the design time capabilitied to
be fully documented and base functionality to be publicly available for use
as base classes rather than undocumented and hidden away in 'internal' code.
Hopefully this stuff is available through vsip or some such and I just
haven't stumbled my way across it yet.

I haven't found any in depth books on the subject of vs design time
support - can you recommend any ?







Steven Cheng said:
Hi Gerry,

How are you doing?

Regarding on this issue, I've performed some further research and
discussed
with some other ASP.NET engineers.

So far we can think of one way to achieve this, but I think it is total
overkill. Whenever your template is persisted (when
GetPersistenceContent()
is called), you could examine your control tree and modify it to make sure
it contains the container controls. You could then persist that control
tree into text, then re-parse it into an ITemplate and set your property
to
that value. Then when ASP.NET persists your template it'll persist the
modified template.

Some scenarios that are a bit similar to this are that the MultiView
control can only contain View controls. Similarly, WebPartZones can only
contain WebParts. You might want to dig into their designer and runtime
code to see how they handle this. I've used the reflector tool to inspect
the code abit and find some code logic for gettting the current inner
content of control. But may still need more effort on setting the content.

Have you got any progress on your side?

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead


Delighting our customers is our #1 priority. We welcome your comments and
suggestions about how we can improve the support we provide to you. Please
feel free to let my manager know what you think of the level of service
provided. You can send feedback directly to my manager at:
(e-mail address removed).

==================================================
Get notification to my posts through email? Please refer to
http://msdn.microsoft.com/subscriptions/managednewsgroups/default.aspx#notif
ications.


==================================================
This posting is provided "AS IS" with no warranties, and confers no
rights.
--------------------
Content-Transfer-Encoding: 7bit
From: (e-mail address removed) (Steven Cheng [MSFT])
Organization: Microsoft
Date: Thu, 24 Jul 2008 07:43:56 GMT
Subject: RE: custom container control - wrapping child controls
Click to expand...
Hi Gerry,

From your description, you're developing a custom server control which
contains some inner controls, and you want to make some certain kind of
nested subcontrols be wrapper with another control automatically at
design-time, correct?

I've performed some research on this. So far for nested controls, the
custom control itself should be set as "ParseChildren" as false so that
inner markup will be interpreted as control instances. I think you've also
ready done this, correct? Generally, for design-time custoimzation, we
have two tools:

1. A custom control designer

2. A custom control parser

So far I only got some interfaces for customzing the displaying html from
Control Designer , but not the inline markup of the control. Also,
controlbuilder seems focus on the nested control's parsing and population
at runtime. Is there are any particular requirement in your page or
control that it will need such an wrapper element? Maybe we can also look
for some other means on this.

I'll do some further research on this and inform you if I get any new
finding.

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead


Delighting our customers is our #1 priority. We welcome your comments and
suggestions about how we can improve the support we provide to you. Please
feel free to let my manager know what you think of the level of service
provided. You can send feedback directly to my manager at:
(e-mail address removed).

==================================================
Get notification to my posts through email? Please refer to
http://msdn.microsoft.com/subscriptions/managednewsgroups/default.aspx#noti f
ications.

Note: The MSDN Managed Newsgroup support offering is for non-urgent issues
where an initial response from the community or a Microsoft Support
Engineer within 1 business day is acceptable. Please note that each follow
up response may take approximately 2 business days as the support
professional working with you may need further investigation to reach the
most efficient resolution. The offering is not appropriate for situations
that require urgent, real-time or phone-based interactions or complex
project analysis and dump analysis issues. Issues of this nature are best
handled working with a dedicated Microsoft Support Engineer by contacting
Microsoft Customer Support Services (CSS) at
http://msdn.microsoft.com/subscriptions/support/default.aspx.
==================================================
This posting is provided "AS IS" with no warranties, and confers no
rights.
Click to expand...
Click to expand...
 
Thanks for your reply Gerry,

Yes, for temporary solution, perform runtime checking and control wrapper
will be much easier.

Also, I agree that for ASP.NET custom control programming, the resource for
design-time part is still quite limited and I do have received such
feedback before. So far the MSDN contains some basic design-time
programming reference:

http://msdn.microsoft.com/en-us/library/w4hk59ha(VS.85).aspx

For other books, there are some books written by some MVP or other guys:

#Data Source Controls (Part 5 - Design Time Functionality)
http://www.nikhilk.net/DataSourceControlsDesignTime.aspx

And I would recommemd you some MS dev engineer's blog since there are some
useful tech articles and information there. Actually, sometimes I also
discuss with some of them for ideas of design-time issues:

http://weblogs.asp.net/leftslipper/archive/2007/02/15/attributes-to-consider
-applying-when-writing-a-custom-control.aspx

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead


Delighting our customers is our #1 priority. We welcome your comments and
suggestions about how we can improve the support we provide to you. Please
feel free to let my manager know what you think of the level of service
provided. You can send feedback directly to my manager at:
(e-mail address removed).

==================================================
Get notification to my posts through email? Please refer to
http://msdn.microsoft.com/subscriptions/managednewsgroups/default.aspx#notif
ications.

==================================================
This posting is provided "AS IS" with no warranties, and confers no
rights.--------------------
From: "gerry" <[email protected]>
References: <[email protected]>
Click to expand...
 
Thanks Steven.

Steven Cheng said:
Thanks for your reply Gerry,

Yes, for temporary solution, perform runtime checking and control wrapper
will be much easier.

Also, I agree that for ASP.NET custom control programming, the resource
for
design-time part is still quite limited and I do have received such
feedback before. So far the MSDN contains some basic design-time
programming reference:

http://msdn.microsoft.com/en-us/library/w4hk59ha(VS.85).aspx

For other books, there are some books written by some MVP or other guys:

#Data Source Controls (Part 5 - Design Time Functionality)
http://www.nikhilk.net/DataSourceControlsDesignTime.aspx

And I would recommemd you some MS dev engineer's blog since there are some
useful tech articles and information there. Actually, sometimes I also
discuss with some of them for ideas of design-time issues:

http://weblogs.asp.net/leftslipper/archive/2007/02/15/attributes-to-consider
-applying-when-writing-a-custom-control.aspx

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead


Delighting our customers is our #1 priority. We welcome your comments and
suggestions about how we can improve the support we provide to you. Please
feel free to let my manager know what you think of the level of service
provided. You can send feedback directly to my manager at:
(e-mail address removed).

==================================================
Get notification to my posts through email? Please refer to
http://msdn.microsoft.com/subscriptions/managednewsgroups/default.aspx#notif
ications.

==================================================
This posting is provided "AS IS" with no warranties, and confers no
rights.--------------------
Click to expand...
 
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