User control refactoring (WPF)

[XJ]

Hi Expert,
i'm doing some program for my project which using WPF, to create
my application more managible i would apply "user control" concept for
my project for each section of my workspace.

to make my workspace more flexible, all the "namespace" and "user
control" name will store into DB, once user launch my application,
base on different user setting i'm able to load for different user
control accordingly base on on the DB record.

i have 2 question now:

1. How to declare those user control "name space" thru codebehind ?
right now i only able to code my "name space" at XAML
example: xmlns:uccustom="clr-namespace:WpfApplication1"

2. How to declare the "user control" name thru codebehind?
right now i also have to declare the user control name at XAML
example: <uccustom:UserControl1 Margin="20,0,-605,-236.5"
Height="188" VerticalAlignment="Bottom"/>

* so far i only know to do the setting from XAML, but which is not
enough flexible due to setting concept.please advise , thanks
best regards

[Peter Duniho]

On Tue, 22 Jul 2008 14:12:07 -0700, XJ <ia*****@gmail.comwrote:

[...]
* so far i only know to do the setting from XAML, but which is not
enough flexible due to setting concept.please advise , thanks

If you can't automatically generate the XAML to layout your UI
conditionally as you like, you can just write C# code to do it. I presume
that's why you're posting here in the C# newsgroup.

Beyond that though, it's not clear what you're asking. You can design
your own UserControl sub-class, and then in the code that goes with your
XAML, just check the database record you care about and conditionally
add/place whatever UserControl instances are appropriate to that database
record (after instantiating them explicitly, of course).

I don't know that there's really any specific answer to your #2 question;
it seems to me that you'd just use XAML to define each UserControl
sub-class as appropriate, as you're already doing. For the #1 question, I
don't understand why the default name space isn't appropriate, nor why you
care, given the rest of what you wrote. But assuming it's important, it
seems like you could just explicitly write a new namespace as appropriate
for your needs (you have to change it in both the .xaml and the .cs file).

Pete

[XJ]

On Jul 23, 5:54*am, "Peter Duniho" <[e-mail]>
wrote:

On Tue, 22 Jul 2008 14:12:07 -0700, XJ <[e-mail]:

[...]
* so far i only know to do the setting from XAML, but which is not
enough flexible due to setting concept.please advise , thanks

If you can't automatically generate the XAML to layout your UI *
conditionally as you like, you can just write C# code to do it. *I presume *
that's why you're posting here in the C# newsgroup.

Beyond that though, it's not clear what you're asking. *You can design *
your own UserControl sub-class, and then in the code that goes with your *
XAML, just check the database record you care about and conditionally *
add/place whatever UserControl instances are appropriate to that database*
record (after instantiating them explicitly, of course).

I don't know that there's really any specific answer to your #2 question;*
it seems to me that you'd just use XAML to define each UserControl *
sub-class as appropriate, as you're already doing. *For the #1 question, I *
don't understand why the default name space isn't appropriate, nor why you *
care, given the rest of what you wrote. *But assuming it's important, it *
seems like you could just explicitly write a new namespace as appropriate*
for your needs (you have to change it in both the .xaml and the .cs file)..

Pete

Hi Pete,
thanks for your reply, yes, i use C# to develop my
application.
try to imagine, i develop a dockPanel inside my WPF windows ,
which is open for my colleage to post their own "user control" , for
sure my colleage have to develop their own XAML file ( and code
behind) and make as dll , once they done for their User control, they
will goto database to provide the user control name space and user
control name, base on the login , my dock Panel windows will trigger
"their" own user control from my dock panel.

i have no experience to write the code behind to execute and
build the "user control" at runtime.

best regards

[Peter Duniho]

On Tue, 22 Jul 2008 17:58:17 -0700, XJ <ia*****@gmail.comwrote:

[...]
try to imagine, i develop a dockPanel inside my WPF windows ,
which is open for my colleage to post their own "user control" , for
sure my colleage have to develop their own XAML file ( and code
behind) and make as dll , once they done for their User control, they
will goto database to provide the user control name space and user
control name, base on the login , my dock Panel windows will trigger
"their" own user control from my dock panel.

i have no experience to write the code behind to execute and
build the "user control" at runtime.

You mention "code-behind", so I'm assuming you're doing some sort of web
application. Hopefully my comments aren't too far off track; they're
based on my experiences with regular non-web applications, but hopefully
the same principles apply.

You really have two parts to your goal: 1) dynamically adding UserControl
sub-classes to your existing WPF window, and 2) providing "plug-in"
support for said sub-classes.

The #1 part is easy enough. You simply instantiate your UserControl
sub-class and add it programmatically.

The #2 is more complicated. Creating the DLL with the UserControl
sub-class isn't difficult, but then you need to use reflection to load the
DLL (assembly), and you need to write some code to map the names found in
the database to those found in whatever DLL's have been loaded, and of
course after all that, you need to use reflection to do the instantiation
of the UserControl sub-class as required for part #1. See the
System.Reflection namespace for more details.

Whether any of this addresses the two specific questions you asked, I'm
not sure. But it seems like it's the information you actually need given
the stated goal. :)

Pete