[WinUI] nre at CommunityToolkit.WinUI.Media.Pipelines.PipelineBuilder

[Cornmarket]

Describe the bug

Getting null reference exception on a WinUI application when using UIElementExtensions.VisualFactory

Regression

No response

Reproducible in sample app?

• This bug can be reproduced in the sample app.

Steps to reproduce

Stack trace:
  _at CommunityToolkit.WinUI.Media.Pipelines.PipelineBuilder.<BuildAsync>d__9.MoveNext()
   at CommunityToolkit.WinUI.Media.PipelineVisualFactoryBase.<GetAttachedVisualAsync>d__0.MoveNext()
   at System.Threading.Tasks.ValueTask`1.get_Result()
   at CommunityToolkit.WinUI.Media.PipelineVisualFactory.<GetAttachedVisualAsync>d__8.MoveNext()
   at System.Threading.Tasks.ValueTask`1.get_Result()
   at CommunityToolkit.WinUI.Media.UIElementExtensions.<OnVisualFactoryPropertyChanged>d__3.MoveNext()
   at System.Threading.Tasks.Task.<>c.<ThrowAsync>b__128_0(Object state)
   at Microsoft.UI.Dispatching.DispatcherQueueSynchronizationContext.<>c__DisplayClass2_0.<Post>b__0()_


use the following xaml:


            <Grid>
                <Grid>
                    <Viewbox Margin="10">
                        <Grid>
                            <Path Data="F0M6.69808,19.74842  ...14.82079,16.64823 z"
                                  Fill="#FF409CC5"
                                  Stretch="None" />
                        </Grid>
                    </Viewbox>
                </Grid>
            </Grid>
            <Border Grid.RowSpan="2">
                <media:UIElementExtensions.VisualFactory>
                    <media:PipelineVisualFactory Source="{media:BackdropSource}">
                        <media:LuminanceToAlphaEffect />
                        <media:OpacityEffect Value="0.4" />
                        <media:BlendEffect Mode="Multiply" Source="{media:BackdropSource}" />
                        <media:BlurEffect Amount="16" />
                        <media:ShadeEffect Intensity="0.2" Color="#FF222222" />
                    </media:PipelineVisualFactory>
                </media:UIElementExtensions.VisualFactory>
            </Border>




the project references:   

CommunityToolkit.Mvvm 8.2.1
CommunityToolkit.WinUI.Behaviors 8.0.230907
CommunityToolkit.WinUI.Media 8.0.230907
CommunityToolkit.WinUI.UI.Controls 7.1.2
Microsoft.Extensions.Hosting 6.0.1
Microsoft.WindowsAppSDK 1.3.230502000
Microsoft.Xaml.Behaviors.WinUI.Managed 2.0.9
System.Configuration.ConfigurationManager 7.0.0
WinUIEx 2.2

Expected behavior

no nre

Screenshots

No response

Windows Build Number

• Windows 10 1809 (Build 17763)
• Windows 10 1903 (Build 18362)
• Windows 10 1909 (Build 18363)
• Windows 10 2004 (Build 19041)
• Windows 10 20H2 (Build 19042)
• Windows 10 21H1 (Build 19043)
• Windows 11 21H2 (Build 22000)
• Other (specify)

Other Windows Build number

No response

App minimum and target SDK version

• Windows 10, version 1809 (Build 17763)
• Windows 10, version 1903 (Build 18362)
• Windows 10, version 1909 (Build 18363)
• Windows 10, version 2004 (Build 19041)
• Other (specify)

Other SDK version

No response

Visual Studio Version

No response

Visual Studio Build Number

No response

Device form factor

No response

Nuget packages

No response

Additional context

No response

Help us help you

Yes, I'd like to be assigned to work on this item.

Hello Cornmarket, thank you for opening an issue with us!

I have automatically added a "needs triage" label to help get things started. Our team will analyze and investigate the issue, and escalate it to the relevant team if possible. Other community members may also look into the issue and provide feedback 🙌

[michael-hawker]

This should be a duplicate of #235 I believe