XAML extension question

[Lloyd Dupont]

In my application I want to display some data in a list box.
I need to display the data as a picture.

My 1st idea was to create a ValueConverter to convert my datas to
ImageSource
But this has a few problem, the biggest one is there is no parameter!
So I though of MarkupExtension
something like that:
<ListBox ItemsSource={Binding Document.Maps}>
<ItemTemplate>
<Image Source="{local:Map2Image PreviewDpi=24, Background=false}" />
</ItemTemplate>
</ListBox>

but here, problem, in the Map2ImageExtension.ProvideValue(IServiceProvider)
I don't ave the current data, worst, I have no idea to get it.

I was able to get the IProvideValueTarget but it only knows about the
"Image" object, not about the current item.
I tried to look into the "Binding" and "BindingBase" code with reflector,
but I don't understand what's going on...
Any tip?
Otherwise I could write a specialized viewer FrameworkElement, but I though
of using MarkupExtension might be a nice way to solve the problem....

[=?Utf-8?B?SG9yc3QgS2xlaW4=?=]

Hi Lloyd
I don't have an answer to your problem. Sorry.
But today I have the same problem and don't know how to get the instance of
the ServiceProvider.

In my case I want get the "ObjectDataProvider"
How can tell us how we can get our ServiceObjects?
My Xaml:

<ObjectDataProvider x:Key="VitoPatient" ObjectType="{x:Type
VFC:GetDataCommand}" MethodName="Execute">
.....

<StackPanel VFW:DesignView.DataContext="{Binding
Source={VFW:MyDynamicResource VitoPatient},
Path=ParentObjects[Person__Patient]}">
.....

My Class:

<MarkupExtensionReturnType(GetType(Object)),
TypeConverter(GetType(DynamicResourceExtensionConv erter))_
Public Class MyDynamicResource
Inherits System.Windows.DynamicResourceExtension

Public Overrides Function ProvideValue(ByVal serviceProvider As
System.IServiceProvider) As Object
If (Not VitoResourceManager.DesignMode) Then
If (GetType(ObjectDataProvider).IsInstanceOfType(serv iceProvider))
Then
Return MyBase.ProvideValue(serviceProvider)
Else
Return MyBase.ProvideValue(serviceProvider)
End If
Else
Return VitoApplication.FindDynamicResource(Me.ResourceKey .ToString)
End If
End Function

Public Sub New()
MyBase.New()
End Sub

Public Sub New(ByVal resourceKey As Object)
MyBase.New(resourceKey)
End Sub

End Class

[Lloyd Dupont]

Hi,

--

Hi Lloyd
I don't have an answer to your problem. Sorry.
But today I have the same problem and don't know how to get the instance
of
the ServiceProvider.

In my case I want get the "ObjectDataProvider"
How can tell us how we can get our ServiceObjects?

when I read you VB code it looks a bit strange to me... :-/
anyway here is pseudo C# code (i.e. from the top of my head) to lookup for
object by name (define before the object using this markp extension, same
restriction as in StaticResource)

class MyMarkup : MarkupExtension
{
public object ProvideValue(IServiceProvider sp)
{
if(sp == null)
return null
IProvideValueTarget pvt =
(IProvideValueTarget)sp.GetService(typeof(IProvide ValueTarget));
if(pvt == null)
return null;
FrameworkElement fe = pvt.Target as FrameworkElement;
if(fe == null)
return null;

DependencyObject do = fr.FindName("aName");
// ... whatever you need to ...
}
}

[=?Utf-8?B?SG9yc3QgS2xlaW4=?=]

Hi Lloyd

Thanks a lot that looks good to get the TargetObjetct.

But How can I get the Source?

In my case the
<ObjectDataProvider x:Key="VitoPatient" ObjectType="{x:Type
VFC:GetDataCommand}" MethodName="Execute">

Best regards Horst

[Lloyd Dupont]

mmhh... I don't understand the question?..
what is this source you talk about?

anyway your only hope is a FindName() (or FindResource()) call to get other
object on the UI.
Binding use an internal Expression class which sets up event listener and
can
"Horst Klein" <Ho********@discussions.microsoft.comwrote in message
news:47**********************************@microsof t.com...

Hi Lloyd

Thanks a lot that looks good to get the TargetObjetct.

But How can I get the Source?

In my case the
<ObjectDataProvider x:Key="VitoPatient" ObjectType="{x:Type
VFC:GetDataCommand}" MethodName="Execute">

Best regards Horst