Need working sample for OOP Background Task used in WinUI3 / WindowsAppSDK app

[myokeeh]

I am really struggling to get a working OOP background task in a UWP app I'm trying to convert over to WinUI3 / WIndowsAppSDK.

Please provide a working sample.

I've tried following through the sample and referenced docs, but I still can't get it to display a simple toast notification.

Also, how can I debug the OOP background task? The way I know how to do it with the old UWP version no longer works.

[Osirisoo0O]

Here is my sample: https://github.com/Osirisoo0O/WASDKSample
Hope to help you.

[myokeeh]

@Osirisoo0O thank you. With that, I at least know it works. I did have to change the following for it to work for me:

changed MyButton_Click to myButton_Click

changed to _myusername_ in task csproj file below.

  <ItemGroup>
    <None Update="C:\Users\_myusername_\.nuget\packages\microsoft.windows.cswinrt\2.0.2\hosting\x64\native\WinRT.Host.dll">
      <CopyToOutputDirectory>Never</CopyToOutputDirectory>
    </None>
  </ItemGroup>

Now the remaining things to address:

Severity	Code	Description	Project	File	Line	Suppression State
Error	APPX1101	Payload contains two or more files with the same destination path 'Microsoft.InteractiveExperiences.Projection.dll'. Source files: 
C:\Users\_myusername_\.nuget\packages\microsoft.windowsappsdk\1.3.230502000\lib\net6.0-windows10.0.18362.0\Microsoft.InteractiveExperiences.Projection.dll
C:\Users\_myusername_\.nuget\packages\microsoft.windowsappsdk\1.0.0\lib\net5.0-windows10.0.18362.0\Microsoft.InteractiveExperiences.Projection.dll	MYAPP	
C:\Users\_myusername_\.nuget\packages\microsoft.windowsappsdk\1.3.230502000\buildTransitive\Microsoft.Build.Msix.Packaging.targets	1500	

Error	APPX1101	Payload contains two or more files with the same destination path 'Microsoft.WinUI.dll'. Source files: 
C:\Users\_myusername_\.nuget\packages\microsoft.windowsappsdk\1.3.230502000\lib\net6.0-windows10.0.18362.0\Microsoft.WinUI.dll
C:\Users\_myusername_\.nuget\packages\microsoft.windowsappsdk\1.0.0\lib\net5.0-windows10.0.18362.0\Microsoft.WinUI.dll	MYAPP	
C:\Users\_myusername_\.nuget\packages\microsoft.windowsappsdk\1.3.230502000\buildTransitive\Microsoft.Build.Msix.Packaging.targets	1500	

Error	APPX1101	Payload contains two or more files with the same destination path 'Microsoft.Windows.AppLifecycle.Projection.dll'. Source files: 
C:\Users\_myusername_\.nuget\packages\microsoft.windowsappsdk\1.3.230502000\lib\net6.0-windows10.0.18362.0\Microsoft.Windows.AppLifecycle.Projection.dll
C:\Users\_myusername_\.nuget\packages\microsoft.windowsappsdk\1.0.0\lib\net5.0-windows10.0.18362.0\Microsoft.Windows.AppLifecycle.Projection.dll	MYAPP	
C:\Users\_myusername_\.nuget\packages\microsoft.windowsappsdk\1.3.230502000\buildTransitive\Microsoft.Build.Msix.Packaging.targets	1500	

Error	APPX1101	Payload contains two or more files with the same destination path 'Microsoft.Windows.ApplicationModel.DynamicDependency.Projection.dll'. Source files: 
C:\Users\_myusername_\.nuget\packages\microsoft.windowsappsdk\1.3.230502000\lib\net6.0-windows10.0.18362.0\Microsoft.Windows.ApplicationModel.DynamicDependency.Projection.dll
C:\Users\_myusername_\.nuget\packages\microsoft.windowsappsdk\1.0.0\lib\net5.0-windows10.0.18362.0\Microsoft.Windows.ApplicationModel.DynamicDependency.Projection.dll	MYAPP	
C:\Users\_myusername_\.nuget\packages\microsoft.windowsappsdk\1.3.230502000\buildTransitive\Microsoft.Build.Msix.Packaging.targets	1500	

Error	APPX1101	Payload contains two or more files with the same destination path 'Microsoft.Windows.ApplicationModel.Resources.Projection.dll'. Source files: 
C:\Users\_myusername_\.nuget\packages\microsoft.windowsappsdk\1.3.230502000\lib\net6.0-windows10.0.18362.0\Microsoft.Windows.ApplicationModel.Resources.Projection.dll
C:\Users\_myusername_\.nuget\packages\microsoft.windowsappsdk\1.0.0\lib\net5.0-windows10.0.18362.0\Microsoft.Windows.ApplicationModel.Resources.Projection.dll	MYAPP	
C:\Users\_myusername_\.nuget\packages\microsoft.windowsappsdk\1.3.230502000\buildTransitive\Microsoft.Build.Msix.Packaging.targets	1500	

Error	APPX1101	Payload contains two or more files with the same destination path 'Microsoft.Windows.ApplicationModel.WindowsAppRuntime.Projection.dll'. Source files: 
C:\Users\_myusername_\.nuget\packages\microsoft.windowsappsdk\1.3.230502000\lib\net6.0-windows10.0.18362.0\Microsoft.Windows.ApplicationModel.WindowsAppRuntime.Projection.dll
C:\Users\_myusername_\.nuget\packages\microsoft.windowsappsdk\1.0.0\lib\net5.0-windows10.0.18362.0\Microsoft.Windows.ApplicationModel.WindowsAppRuntime.Projection.dll	MYAPP	
C:\Users\_myusername_\.nuget\packages\microsoft.windowsappsdk\1.3.230502000\buildTransitive\Microsoft.Build.Msix.Packaging.targets	1500	

Error	APPX1101	Payload contains two or more files with the same destination path 'Microsoft.Windows.System.Power.Projection.dll'. Source files: 
C:\Users\_myusername_\.nuget\packages\microsoft.windowsappsdk\1.3.230502000\lib\net6.0-windows10.0.18362.0\Microsoft.Windows.System.Power.Projection.dll
C:\Users\_myusername_\.nuget\packages\microsoft.windowsappsdk\1.0.0\lib\net5.0-windows10.0.18362.0\Microsoft.Windows.System.Power.Projection.dll	MYAPP	
C:\Users\_myusername_\.nuget\packages\microsoft.windowsappsdk\1.3.230502000\buildTransitive\Microsoft.Build.Msix.Packaging.targets	1500	

Error	APPX1101	Payload contains two or more files with the same destination path 'Microsoft.WindowsAppRuntime.Bootstrap.Net.dll'. Source files: 
C:\Users\_myusername_\.nuget\packages\microsoft.windowsappsdk\1.3.230502000\lib\net6.0-windows10.0.18362.0\Microsoft.WindowsAppRuntime.Bootstrap.Net.dll
C:\Users\_myusername_\.nuget\packages\microsoft.windowsappsdk\1.0.0\lib\net5.0-windows10.0.18362.0\Microsoft.WindowsAppRuntime.Bootstrap.Net.dll	MYAPP	
C:\Users\_myusername_\.nuget\packages\microsoft.windowsappsdk\1.3.230502000\buildTransitive\Microsoft.Build.Msix.Packaging.targets	1500	

Error	APPX1101	Payload contains two or more files with the same destination path 'Newtonsoft.Json.dll'. Source files: 
C:\Users\_myusername_\.nuget\packages\newtonsoft.json\13.0.3\lib\net6.0\Newtonsoft.Json.dll
C:\Users\_myusername_\.nuget\packages\newtonsoft.json\13.0.1\lib\netstandard2.0\Newtonsoft.Json.dll	MYAPP	
C:\Users\_myusername_\.nuget\packages\microsoft.windowsappsdk\1.3.230502000\buildTransitive\Microsoft.Build.Msix.Packaging.targets	1500	

Error	APPX1101	Payload contains two or more files with the same destination path 'System.Management.dll'. Source files: 
C:\Users\_myusername_\.nuget\packages\system.management\6.0.0\runtimes\win\lib\net6.0\System.Management.dll
C:\Users\_myusername_\.nuget\packages\system.management\6.0.0\lib\net6.0\System.Management.dll	MYAPP	
C:\Users\_myusername_\.nuget\packages\microsoft.windowsappsdk\1.3.230502000\buildTransitive\Microsoft.Build.Msix.Packaging.targets	1500	

Related: #1243

[manodasanW]

@myokeeh I think your remaining errors can be addressed by moving your projects to the same version of WinAppSDK. It seems one is using 1.3 while other is on 1.0?

[myokeeh]

@manodasanW The only project referencing WindowsAppSDK is the app. The other two projects are just the background task and a class library. The WinUI3 app and class library were generated with Template Studio.

[Osirisoo0O]

@myokeeh Try to delete WindowsAppSDK 1.0 nuget?
I have similar problems. Resolved by manually replacing files.

[myokeeh]

@Osirisoo0O I've cleared my Nuget cache and just manually deleted "microsoft.windowsappsdk\1.0.0", but rebuilding the solution brings it back.

How do I tell it to ignore 1.0.0?

Also, in your sample, you have 'Microsoft.Windows.SDK.BuildTools' Is that needed? I removed it on your sample and it still seems to work fine. I added it to my project to try--did not help.

[Osirisoo0O]

Maybe the problem from Template Studio.
This sample created since wasdk 1.0 or before, so I don't check it.

[myokeeh]

For reference, when the task project is not referenced in the app project, it builds without errors. Errors show up when it is.

[myokeeh]

Removing the Microsoft.Windows.CsWinRT reference on the background task allows it to build, but I suppose that breaks the background task. With the reference removed, I tried triggering the task, but does nothing (doesn't work) unlike the sample app (works).

[myokeeh]

I put back Microsoft.Windows.CsWinRT and found that at most, these are the ones I can keep refenced and the app builds, runs, and most importantly, the background task works.

Microsoft.Azure.Mobile.Client
Microsoft.Graph
Microsoft.Identity.Client.Broker

Adding the following is what causes the APPX1101 errors to come back:

CommunityToolkit.WinUI.Connectivity
CommunityToolkit.WinUI.Notifications
Microsoft.AppCenter.Analytics
Microsoft.AppCenter.Crashes

[myokeeh]

The fix is adding a Directory.Builds.target file with the following contents per microsoft/WindowsAppSDK#3390

<?xml version="1.0" encoding="utf-8" standalone="no"?>
<Project ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
    <Target Name="CsWinRTAuthoring_AddManagedDependencies" />
</Project>