FindResource problem( Reusing Drawings )

The problem I assume you're hitting is that the Polygon already has a
parent. Polygon is an Element (and a Visual) and these can be made into a
tree - not a graph - meaning that each Element can only have one parent. If
you wish to re-use vector content, consider using Drawings, like so:

<ResourceDictionary>
<GeometryDrawing x:Key="MySquare" Brush="Orange" Geometry="M0,0 L0,1 1,1
1,0 z" />
</ResourceDictionary>

<Image>
<Image.Source>
<DrawingImage Drawing="{DynamicResource MySquare}"/>
</Image.Source>
</Image>

.... or similarly through code.

-Adam


"Igor Lisbaron" <igorl@afcon.co.il> wrote in message
news:uQd93Fd0GHA.4580@TK2MSFTNGP05.phx.gbl...
> Hello everyone !
>
>
> I had defined some shape element ( Polygon for example )
> in a resourse.xaml file and want to draw it in a Canvas.
> I have tried the following code, that works properly:
> Polygon p = (Polygon)this.FindResource("MyPoligon");
>
> this.canvas.Children.Add(p);
>
>
>
> But when I have tried to draw another one polygon using the same resource,
> I had caught an exception.
>
> So my question is : How can I draw another one polygon from my c# code ?
>
>
>
> Igor
>
>
>
>

Hello everyone !


I had defined some shape element ( Polygon for example )
in a resourse.xaml file and want to draw it in a Canvas.
I have tried the following code, that works properly:
Polygon p = (Polygon)this.FindResource("MyPoligon");

this.canvas.Children.Add(p);



But when I have tried to draw another one polygon using the same resource, I
had caught an exception.

So my question is : How can I draw another one polygon from my c# code ?



Igor

You can also set x:Shared="false" on the ResourceDictionary item to make it
return a new instance instead of a reference to the item by default. For
example:

<StackPanel>
<StackPanel.Resources>
<Polygon x:Key="foo" x:Shared="false" Points="0 0 0 50 50 50 50 0 "
Fill="Blue" Stroke="Green" StrokeThickness="10"/>
</StackPanel.Resources>
<StaticResource ResourceKey="foo"/>
<StaticResource ResourceKey="foo"/>
</StackPanel>


"Igor Lisbaron" <igorl@afcon.co.il> wrote in message
news:uQd93Fd0GHA.4580@TK2MSFTNGP05.phx.gbl...
> Hello everyone !
>
>
> I had defined some shape element ( Polygon for example )
> in a resourse.xaml file and want to draw it in a Canvas.
> I have tried the following code, that works properly:
> Polygon p = (Polygon)this.FindResource("MyPoligon");
>
> this.canvas.Children.Add(p);
>
>
>
> But when I have tried to draw another one polygon using the same resource,
> I had caught an exception.
>
> So my question is : How can I draw another one polygon from my c# code ?
>
>
>
> Igor
>
>
>
>

True - though you should be aware that this will not actually share the
resource, which will have implications for working set. Also, this feature
doesn't work in loose xaml, only complied apps. On the other hand, if you
actually *want* multiple Elements, this is clearly the feature for you.

-Adam Smith [MS]

"Dennis Cheng [MSFT]" <dennis.cheng@online.microsoft.com> wrote in message
news:usV0dLh0GHA.4476@TK2MSFTNGP05.phx.gbl...
> You can also set x:Shared="false" on the ResourceDictionary item to make
> it return a new instance instead of a reference to the item by default.
> For example:
>
> <StackPanel>
> <StackPanel.Resources>
> <Polygon x:Key="foo" x:Shared="false" Points="0 0 0 50 50 50 50 0
> " Fill="Blue" Stroke="Green" StrokeThickness="10"/>
> </StackPanel.Resources>
> <StaticResource ResourceKey="foo"/>
> <StaticResource ResourceKey="foo"/>
> </StackPanel>
>
>
> "Igor Lisbaron" <igorl@afcon.co.il> wrote in message
> news:uQd93Fd0GHA.4580@TK2MSFTNGP05.phx.gbl...
>> Hello everyone !
>>
>>
>> I had defined some shape element ( Polygon for example )
>> in a resourse.xaml file and want to draw it in a Canvas.
>> I have tried the following code, that works properly:
>> Polygon p = (Polygon)this.FindResource("MyPoligon");
>>
>> this.canvas.Children.Add(p);
>>
>>
>>
>> But when I have tried to draw another one polygon using the same
>> resource, I had caught an exception.
>>
>> So my question is : How can I draw another one polygon from my c# code ?
>>
>>
>>
>> Igor
>>
>>
>>
>>
>
>