URGENT: HowTo reference dynamically to a class name vb.net

[Andreas Klemt]

Hello Kevin,
ok thanks, but can you give me an example how to reference dynamically to
the class to call a method.
Thanks,
Andreas

"Kevin Spencer" <kevin@takempis.com> schrieb im Newsbeitrag
news:e7hu7sCWDHA.2032@TK2MSFTNGP11.phx.gbl...

> First, you added your Control to the Controls collection of a PlaceHolder
> Control. Next, you tried to grab it from the Controls Collection of the
> Page. Don't you think you ought to grab it from the Controls Collection of
> the PlaceHolder Control instead?
>
> --
> HTH,
>
> Kevin Spencer
> Microsoft MVP
> .Net Developer
> [url]http://www.takempis.com[/url]
> Complex things are made up of
> lots of simple things.
>
> "Andreas Klemt" <aklemt68@hotmail.com> wrote in message
> news:eFYb0BCWDHA.1204@TK2MSFTNGP12.phx.gbl...

> > Hello,
> > I have this
> >
> > I loading dynamically WebControls
> > Dim ctl As Control = Page.LoadControl("Controls/ & userID.ToString &
> > ".ascx")
> > ctl.ID = "ctlUser
> > Me.placeHolder1.Controls.AddAt(0, ctl)
> >
> > Now I want to dynamically Reference to the control like this:
> > CType(Me.FindControl("ctlUser"), ??dynamicallyClassname??)
> >
> > How is this possible?
> >
> > Thanks in advance,
> > Andreas
> >
> >

>
>

[Andreas Klemt]

Hello Kevin,
many thanks for you reply.
I would be happy if you could post an example which could show
how to load dynamically a type which is in my placeHolder. In my
class I want to call a function which gives me back a String where some
form values are in there from a postback.
And I call always the same Method-Name but I have different UserControls.

I would be very glad if you could help me!

Thanks in advance,
Andreas


"Kevin Spencer" <kevin@takempis.com> schrieb im Newsbeitrag
news:u$Y7IsDWDHA.2156@TK2MSFTNGP11.phx.gbl...

> Hi Andreas,
>
> It's kind of difficult to answer your question, as I don't have enough
> information. In the code you posted, you're loading a UserControl
> dynamically, and it could be one of many different User Controls. In your
> code, you can get the ID of the control, as you are assigning it after
> adding it to the Controls Collection of the PlaceHolder. But of course, in
> order to call a method of that Control, you need to know the Type of it,

and

> cast it as that Type. Finding out the Type isn't difficult, but how you go
> about it, and how you call a method, depends on a couple of things that
> aren't apparent from your description so far.
>
> For example, as the Controls are all UserControls, if you want to call a
> method of UserControl, you can just cast the object as
> System.Web.UI.UserControl, as all the properties and methods of

UserControl

> are shared by all UserControls. If, on the other hand, you want to call a
> method that is specific to the implementation of UserControl which you've
> created, it gets more difficult, as you won't know what methods are
> available to that Control initially (it could be any of many inherited
> Types). In that case, you could use Reflection to find out the type of the
> Control and then use a Select Case Statement to figure out which method to
> call, depending on the Type.
>
> If you can clarify the missing information, I will be glad to post a

snippet

> as an example.
>
> --
> HTH,
>
> Kevin Spencer
> Microsoft MVP
> .Net Developer
> [url]http://www.takempis.com[/url]
> Complex things are made up of
> lots of simple things.
>
> "Andreas Klemt" <aklemt68@hotmail.com> wrote in message
> news:e8phzzCWDHA.2228@TK2MSFTNGP12.phx.gbl...

> > Hello Kevin,
> > ok thanks, but can you give me an example how to reference dynamically

to

> > the class to call a method.
> > Thanks,
> > Andreas
> >
> > "Kevin Spencer" <kevin@takempis.com> schrieb im Newsbeitrag
> > news:e7hu7sCWDHA.2032@TK2MSFTNGP11.phx.gbl...

> > > First, you added your Control to the Controls collection of a

> PlaceHolder

> > > Control. Next, you tried to grab it from the Controls Collection of

the

> > > Page. Don't you think you ought to grab it from the Controls

Collection

> of

> > > the PlaceHolder Control instead?
> > >
> > > --
> > > HTH,
> > >
> > > Kevin Spencer
> > > Microsoft MVP
> > > .Net Developer
> > > [url]http://www.takempis.com[/url]
> > > Complex things are made up of
> > > lots of simple things.
> > >
> > > "Andreas Klemt" <aklemt68@hotmail.com> wrote in message
> > > news:eFYb0BCWDHA.1204@TK2MSFTNGP12.phx.gbl...
> > > > Hello,
> > > > I have this
> > > >
> > > > I loading dynamically WebControls
> > > > Dim ctl As Control = Page.LoadControl("Controls/ & userID.ToString &
> > > > ".ascx")
> > > > ctl.ID = "ctlUser
> > > > Me.placeHolder1.Controls.AddAt(0, ctl)
> > > >
> > > > Now I want to dynamically Reference to the control like this:
> > > > CType(Me.FindControl("ctlUser"), ??dynamicallyClassname??)
> > > >
> > > > How is this possible?
> > > >
> > > > Thanks in advance,
> > > > Andreas
> > > >
> > > >
> > >
> > >

> >
> >

>
>

[Andreas Klemt]

Kevin, here is what I mean

Page_Init:
Select Case userID
case 1
Dim ctl As Control = Page.LoadControl("myControls/userID" & userID.ToString
& ".ascx")
ctl.ID = "idOfMyUserControl"
Me.placeHolder1.Controls.AddAt(0, ctl)
....
End Select
....
....
After PostBack:

CType(Me.FindControl("idOfMyUserControl"), "DYNAMIC
TYPE??").GetValuesAsString





"Kevin Spencer" <kevin@takempis.com> schrieb im Newsbeitrag
news:u$Y7IsDWDHA.2156@TK2MSFTNGP11.phx.gbl...

> Hi Andreas,
>
> It's kind of difficult to answer your question, as I don't have enough
> information. In the code you posted, you're loading a UserControl
> dynamically, and it could be one of many different User Controls. In your
> code, you can get the ID of the control, as you are assigning it after
> adding it to the Controls Collection of the PlaceHolder. But of course, in
> order to call a method of that Control, you need to know the Type of it,

and

> cast it as that Type. Finding out the Type isn't difficult, but how you go
> about it, and how you call a method, depends on a couple of things that
> aren't apparent from your description so far.
>
> For example, as the Controls are all UserControls, if you want to call a
> method of UserControl, you can just cast the object as
> System.Web.UI.UserControl, as all the properties and methods of

UserControl

> are shared by all UserControls. If, on the other hand, you want to call a
> method that is specific to the implementation of UserControl which you've
> created, it gets more difficult, as you won't know what methods are
> available to that Control initially (it could be any of many inherited
> Types). In that case, you could use Reflection to find out the type of the
> Control and then use a Select Case Statement to figure out which method to
> call, depending on the Type.
>
> If you can clarify the missing information, I will be glad to post a

snippet

> as an example.
>
> --
> HTH,
>
> Kevin Spencer
> Microsoft MVP
> .Net Developer
> [url]http://www.takempis.com[/url]
> Complex things are made up of
> lots of simple things.
>
> "Andreas Klemt" <aklemt68@hotmail.com> wrote in message
> news:e8phzzCWDHA.2228@TK2MSFTNGP12.phx.gbl...

> > Hello Kevin,
> > ok thanks, but can you give me an example how to reference dynamically

to

> > the class to call a method.
> > Thanks,
> > Andreas
> >
> > "Kevin Spencer" <kevin@takempis.com> schrieb im Newsbeitrag
> > news:e7hu7sCWDHA.2032@TK2MSFTNGP11.phx.gbl...

> > > First, you added your Control to the Controls collection of a

> PlaceHolder

> > > Control. Next, you tried to grab it from the Controls Collection of

the

> > > Page. Don't you think you ought to grab it from the Controls

Collection

> of

> > > the PlaceHolder Control instead?
> > >
> > > --
> > > HTH,
> > >
> > > Kevin Spencer
> > > Microsoft MVP
> > > .Net Developer
> > > [url]http://www.takempis.com[/url]
> > > Complex things are made up of
> > > lots of simple things.
> > >
> > > "Andreas Klemt" <aklemt68@hotmail.com> wrote in message
> > > news:eFYb0BCWDHA.1204@TK2MSFTNGP12.phx.gbl...
> > > > Hello,
> > > > I have this
> > > >
> > > > I loading dynamically WebControls
> > > > Dim ctl As Control = Page.LoadControl("Controls/ & userID.ToString &
> > > > ".ascx")
> > > > ctl.ID = "ctlUser
> > > > Me.placeHolder1.Controls.AddAt(0, ctl)
> > > >
> > > > Now I want to dynamically Reference to the control like this:
> > > > CType(Me.FindControl("ctlUser"), ??dynamicallyClassname??)
> > > >
> > > > How is this possible?
> > > >
> > > > Thanks in advance,
> > > > Andreas
> > > >
> > > >
> > >
> > >

> >
> >

>
>

[Unregistered]

Can you try something like this:

dim ctrl as control = CType(Me.FindControl("idOfMyUserControl"), object)
if not isnothing(ctrl) then
'to do: get the type of the control etc...
end if