Programming with .NET - General

Re: Re: Silverlight User Control Inheritance

zuppaman — Fri, 06 Mar 2009 11:40:02 GMT

Hi Guys,

I also encountered the same problem.
Like wjchristenson2 created a blog post about it.

You can solve this problem with two methods.
Creating a wrapper as discussed above our use the strategy pattern.

Check out the code at : http://www.lab101.be/2008/07/silverlight-usercontrol-inheritance/

Re: Re: Silverlight User Control Inheritance

wjchristenson2 — Thu, 22 Jan 2009 02:39:32 GMT

I've just blogged on how I got UserControl inheritance to work for me. Hope this helps:

http://www.mostlydevelopers.com/blog/post/2009/01/21/Silverlight-User-Control-Inheritance.aspx

Re: Re: Silverlight User Control Inheritance

talldaniel — Sat, 06 Dec 2008 05:01:56 GMT

If you go through all of these contortions, it will likely be the case that when the next upgrade is released, the work arounds will bust.

Re: Re: Re: Silverlight User Control Inheritance

Isil — Sat, 06 Dec 2008 03:44:26 GMT

Thank you very very much

That fixed my problems... but I don't know what I did, could someone explain me??

thank you!

Re: Re: Silverlight User Control Inheritance

Roet — Fri, 28 Nov 2008 09:13:41 GMT

Try adding a reference to the namespace where you have the ItemsControl defined, just like you would with any other custom control you define on a page.

Let's say you defined it in the namespace "Exchange_S2".

<exs2:ItemControl x:Class="Exchange_S2.EmptyItem"
    xmlns="http://schemas.microsoft.com/client/2007"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc=http://schemas.openxmlformats.org/markup-compatibility/2006
    xmlns:exs2="clr-namespace:Exchange_S2"
"clr-namespace:TodayIT.Avalanche2.Web.Controls.Basic    mc:Ignorable="d"
     MouseEnter="OnMouseEnter" MouseLeave="OnMouseLeave"
xmlns:vsm="clr-namespace:System.Windows;assembly=System.Windows"
MinWidth="110" MinHeight="110" Padding="0,0,0,0" Margin="10,10,10,10"
HorizontalAlignment="Stretch" VerticalAlignment="Stretch"
d:DesignHeight="200" d:DesignWidth="200" Width="140" Height="140"
MaxWidth="300" MaxHeight="300">

</exs2:ItemControl>

 If the above doesn't work, try the following, on top of the solution mentioned above: Add a reference in AssemblyInfo.cs [assembly: XmlnsDefinition("http://schemas.microsoft.com/client/2007", "Exchange_S2")]

Re: Silverlight User Control Inheritance

Isil — Tue, 25 Nov 2008 15:25:24 GMT

I'm still having problems with this.

I'm getting this exception:

System.Windows.Markup.XamlParseException occurred
Message="Unknown Element: ItemControl. [Line: 7 Position: 375]"
LineNumber=7
LinePosition=375
StackTrace:
       en System.Windows.Application.LoadComponent(Object component, Uri resourceLocator)
       en Exchange_S2.EmptyItem.InitializeComponent()
       en Exchange_S2.EmptyItem..ctor()
InnerException:

that is related to this xaml:

 
<ItemControl x:Class="Exchange_S2.EmptyItem"
    xmlns="http://schemas.microsoft.com/client/2007"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
     MouseEnter="OnMouseEnter" MouseLeave="OnMouseLeave" 
xmlns:vsm="clr-namespace:System.Windows;assembly=System.Windows" 
MinWidth="110" MinHeight="110" Padding="0,0,0,0" Margin="10,10,10,10" 
HorizontalAlignment="Stretch" VerticalAlignment="Stretch" 
d:DesignHeight="200" d:DesignWidth="200" Width="140" Height="140" 
MaxWidth="300" MaxHeight="300">

 Any ideas?? I really need to get this fixed.

Re: Silverlight User Control Inheritance

gabtub — Wed, 29 Oct 2008 12:39:16 GMT

i just wondered if there's a fix now in the new version for these inheritance problems?

Re: Re: Silverlight User Control Inheritance

mchlSync — Sat, 23 Aug 2008 20:36:57 GMT

If it's nested namespace, please check my reply in this post http://silverlight.net/forums/p/23213/83217.aspx#83217

Re: Re: Silverlight User Control Inheritance

plafond444 — Thu, 17 Jul 2008 18:59:33 GMT

rceles:
the Solution in last Post work correctly, but in Silverlight 2 Beta 2, throw a "Catastrofic Error"; for do this work i do:

It works for me in Silverlight 2 Beta 2... From what class do you derive your base class (mine was from UserControl)?

Re: Re: Silverlight User Control Inheritance

rceles — Thu, 17 Jul 2008 18:28:07 GMT

the Solution in last Post work correctly, but in Silverlight 2 Beta 2, throw a "Catastrofic Error"; for do this work i do:

set { base.Content=new ContentControl(); ((ContentContol)base.Content).Content=value:}

regards.

Roberto.

Re: Silverlight User Control Inheritance

plafond444 — Fri, 04 Jul 2008 18:30:40 GMT

...to get rid of "The property 'Content' does not exist on the type..." warnings in Visual Studio and fix the Blend's "Cannot add content to an object of type..." issue, just add this property to your base class:

        public new UIElement Content
        {
            get { return base.Content; }
            set { base.Content = value; }
        }

note: unfortunately, your base class cannot be abstract if you want to use the visual designer in Blend

Re: Re: Re: Silverlight User Control Inheritance

syntax42 — Wed, 02 Jul 2008 13:06:55 GMT

(EDIT: wrong link)

Thanks for the quick reply!

In the meantime i found out what is causing the error message:

http://silverlight.net/forums/t/14936.aspx (the last posts)

It seems there there IS a bug in Beta 2 of Silverlight 2. It occurs if you have a base class WITH XAML and a standard, code-only inherited class. I hope it will be fixed soon (RC?), as my whole application is build around this concept.

Re: Re: Silverlight User Control Inheritance

caperaven — Wed, 02 Jul 2008 12:23:50 GMT

The parse error basicially means that there is a problem with your xaml vs backend code.

Could be something stupid such as a name space change or class name change.
It could be as complicated as a wrong xaml loading path if you made this a resource xaml file and custom load it.

The problem here is that the tools is falling behind the technology.
What I would stuggest is that you look at your xaml header content and make sure you are referencing the right class with the right namespace on the right assembly and all that.

The look at the loading code and make sure you are indeed loading the right file.

Also look at the xaml in VS2008 and if you see a blue squigal line, something in the xaml is wrong.

Your problem may not even be in the xaml you are looking at, but in a control you may have written in a other assembly that is not matching up.

Good luck with resolving your problem.

Re: Re: Silverlight User Control Inheritance

syntax42 — Wed, 02 Jul 2008 12:13:34 GMT

Just to clearify things. Was this issue ever resolved with at workaround? I still get the AG_E_PARSER_BAD_TYPE runtime error message. I have tried every suggestion on this thread.

Is it a bug that will be fixed in the final release? (I hope so )

Re: Silverlight User Control Inheritance

InquisitorJax — Thu, 19 Jun 2008 06:01:27 GMT

Shahed,

The VS designer works fine with or without the assemblyinfo entry.

I was referring to the Designer in Blend that won't render the TestControl from your example (but will render Page.xaml if

you add TestControl to the xaml)

Jax