LoadControl(Type t, object[] parameters) usage

[ASPboy]

has anybody used this type of loading user controls,

in the user control how will i hadle the passed parameters in the contructor
and also

can somebody give a code script for instantiating the object[] parameters

thanks.

[Alessandro Zifiglio]

for eg. if the constructor for the control you want to load looks like this
:

public myUserControl (string s, bool b, int i){// constructor code here}


// as you can see there are 3 arguments for the constructor.
// One thing to be careful about is that you need to pass the arguments in
the same order they are
// listed in your constructor, and the type of the objects in your object
array should match,
// so as in the following code.

object[] myParameters = {"test", true, 3};

myUserControl c1 = LoadControl(myUserControl, myParameters);


Regards,
Alessandro Zifiglio
[url]http://www.AsyncUI.net[/url]

"ASPboy" <g@gmail.com> ha scritto nel messaggio
news:BNWdncng1rJZlyvZRVnyvQ@giganews.com...

> has anybody used this type of loading user controls,
>
> in the user control how will i hadle the passed parameters in the
> contructor
> and also
>
> can somebody give a code script for instantiating the object[] parameters
>
> thanks.

[Alessandro Zifiglio]

Also, dont forget to check the relevent documentation. Its pretty clear in
what you need to do :

[url]http://msdn2.microsoft.com/en-us/library/ewtd66a0.aspx[/url]

Regards,
Alessandro Zifiglio
[url]http://www.AsyncUI.net[/url]


"Alessandro Zifiglio" <AlessandroZifiglio @ -h-o-t-m-a-i-l-c-o-m> ha scritto
nel messaggio news:uJpL%23MnpGHA.1548@TK2MSFTNGP04.phx.gbl...

> for eg. if the constructor for the control you want to load looks like
> this :
>
> public myUserControl (string s, bool b, int i){// constructor code here}
>
>
> // as you can see there are 3 arguments for the constructor.
> // One thing to be careful about is that you need to pass the arguments in
> the same order they are
> // listed in your constructor, and the type of the objects in your object
> array should match,
> // so as in the following code.
>
> object[] myParameters = {"test", true, 3};
>
> myUserControl c1 = LoadControl(myUserControl, myParameters);
>
>
> Regards,
> Alessandro Zifiglio
> [url]http://www.AsyncUI.net[/url]
>
> "ASPboy" <g@gmail.com> ha scritto nel messaggio
> news:BNWdncng1rJZlyvZRVnyvQ@giganews.com...

>> has anybody used this type of loading user controls,
>>
>> in the user control how will i hadle the passed parameters in the
>> contructor
>> and also
>>
>> can somebody give a code script for instantiating the object[] parameters
>>
>> thanks.

>
>

[Unregistered]

ASPBoy,

I feel your pain. Alessandro - you may want to read the question a bit more carefully before you post a potentially condescending response to someone's question. It's not really clear what ASPBoy needs to do to use the LoadControl overload he's asking about.

ASPBoy - this is a shortfall by MS w/ a documented cop-out they've added to their MSDN Online help. I also would like to use LoadControl(TYPE) not LoadControl(stringPathToControl) because I also see the value in being able to freely move a User Control from one folder to the next without having to search and replace path references in your code... Unfortunately, as I've just mentioned, MS cops out of resolving this with their typical "by-design" response:

http://msdn.microsoft.com/en-us/library/ewtd66a0(v=VS.90).aspx

Make sure you have 3.5 framework selected (they haven't fixed this 4.0 either, but the post only shows up in 3.5). They say this, regarding load by type:

From MSDN Docs online, re: LoadControl(type, params):

----------------------------------------------------------------------------
Does not instantiate controls defined on ascx page
https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=103456

Description
A page that loads a user control using the Page.LoadControl(Type, Object[]) does not seem to create its children added in the ascx file.
Using Page.LoadControl(String) works as expected.


Comments
Thank you for submitting this issue. We're investigating and will provide an update on status when we have more information.

-The Web Platform & Tools Team
Posted by Microsoft on 8/06/2005 at 11:08 AM
This is by-design since the type "TestUC" is actually the base type used by the partial class, it does not contain the proper code to instantiate TextBox1 reference, which is actually defined in the derived type. There are two workarounds: 1. Use LoadControl("TestControl.ascx"), for all practical, this behaves identically to LoadControl(type) but it instantiates the derived type, which knows how to instantiate TextBox1. 2. Use a single file page and adds <%@ Reference %> directive to the page to reference the user control, and assign a classname to the ascx page. Then it's safe to use LoadControl(type)

Thanks for reporting the issue.
Web Platform and Tools Team.
Posted by Microsoft on 14/06/2005 at 6:31 PM
--------------------------------------------------------------------------

So, quite unfortunately, no work around other than to use the LoadControl(pathToControl) technique, as nobody from MS has bothered to respond to users requesting more clarity on the second "workaround" provided above, which is explained just poorly enough to have you waste a few days trying to figure out what they meant. They'll really have to spell it out with a code sample because I have no idea what they're referring to.

Anyhow, again, I fully feel your pain, and it took me so long to find out why the call wasn't working I felt I had to share the rotten fruits of my labor... :)

Happy coding!

Brian