Microsoft.Toolkit.Wpf.UI.Controls incompatible with .Net 5.0

[matthew25187]

Describe the bug

If I try to compile a .Net 5.0 WPF application that includes the Microsoft.Toolkit.Wpf.UI.Controls package, I get the following error:
NETSDK1135 SupportedOSPlatformVersion 10.0.18362.0 cannot be higher than TargetPlatformVersion 7.0. WpfApp1 C:\Program Files\dotnet\sdk\5.0.100\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.TargetFrameworkInference.targets 185

• Is this bug a regression in the toolkit? If so, what toolkit version did you last see it work:

Steps to Reproduce

Steps to reproduce the behavior:

1. Create a new project based on the WPF App (.NET) template.
2. Add to the project the Microsoft.Toolkit.Wpf.UI.Controls NuGet package.
3. Compile the solution.
4. See error

Expected behavior

I should be able to successfully compile a .Net 5.0 project that includes the Microsoft.Toolkit.Wpf.UI.Controls package.

Screenshots

If applicable, add screenshots to help explain your problem.

Environment

NuGet Package(s): 
Microsoft.Toolkit.Wpf.UI.Controls

Package Version(s): 
6.1.2

Project .NET Version:
- [ ] .NET Framework (version: )
- [ ] .NET Core 3
- [ ] .NET Core 3.1 Preview (version: )

Windows 10 Build Number:
- [ ] Fall Creators Update (16299)
- [ ] April 2018 Update (17134)
- [ ] October 2018 Update (17763)
- [ ] May 2019 Update (18362)
- [ ] Insider Build (build number: )

App min and target version:
- [ ] Fall Creators Update (16299)
- [ ] April 2018 Update (17134)
- [ ] October 2018 Update (17763)
- [ ] May 2019 Update (18362)
- [ ] Insider Build (xxxxx)

Device form factor:
- [X] Desktop
- [ ] Xbox
- [ ] Surface Hub
- [ ] IoT

Visual Studio 
- [ ] 2017 (version: )
- [X] 2019 (version: 16.8.0) 
- [ ] 2019 Preview (version: )

Additional context

Add any other context about the problem here.

Hello matthew25187, 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 🙌

[pcfulife]

Adding SupportedOSPlatformVersion 7.0 into your csproj file as message will remove this error.
<SupportedOSPlatformVersion>7.0</SupportedOSPlatformVersion>

But, it will show another error message that you should use cswinrt to use WinRT API in .NET 5

[r-work]

Same issue here.

[JensNordenbro]

Same on Winforms

[nesherhh]

Why is this issue closed? I don't use WebView2. I need MapControl.

[JaykeBird]

I honestly don't understand why this was closed either. I encountered this issue while using the InkCanvas and InkToolbar.

I was hoping to test out XAML Islands alongside the Windows 10 APIs being easily accessible when using .NET 5 at the same time.

[michael-hawker]

@nesherhh @JaykeBird sorry, I misread and didn't realize this was for the root package and not the WebView package and triaged incorrectly. I've re-opened the issue.

FYI @marb2000 @ocalvo.