Microsoft.AspNetCore.Connections.Abstractions Version=6.0.0.0 brakes on dependency injection with .Net 5.0

[ASP-WAF]

I have noted that updating nuget package Microsoft.AspNetCore.Connections.Abstractions to the latest version brakes website running in .Net 5.0. with SDK 5.0.403 when using the nuget package on gets the following exception when the site loads:

System.TypeLoadException: Could not load type 'Microsoft.AspNetCore.Connections.Experimental.IMultiplexedConnectionListenerFactory' from assembly 'Microsoft.AspNetCore.Connections.Abstractions, Version=6.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'.

My workaround is to skip the latest NuGet package by conditionally linking my NuGet Package that supports both.net 5.0 and .net 6.0:

	<ItemGroup>
		<PackageReference Include="Microsoft.AspNetCore.Connections.Abstractions" Version="6.0.0" Condition="'$(TargetFramework)'=='net6.0'" />
		<PackageReference Include="Microsoft.AspNetCore.Connections.Abstractions" Version="5.0.12" Condition="'$(TargetFramework)'!='net6.0'" />
		<PackageReference Include="Microsoft.AspNetCore.Mvc.RazorPages" Version="2.2.5" />
		<PackageReference Include="Microsoft.AspNetCore.StaticFiles" Version="2.2.0" />
		<PackageReference Include="Microsoft.Extensions.Identity.Core" Version="6.0.0" />
	</ItemGroup>

I guess any user using my package in his application can update his consumed packages and override my hack running in the same issue so I am eager to figure out the correct way/package I need to resolve the issue.

Here is my stack:
Stack.txt

[davidfowl]

Why are you referencing these combination of packages? The versions look out of wack. What's the intent here?

[ASP-WAF]

I am using IMultiplexedConnectionListenerFactory in my code, it will not work when using the new 6.0 version in .net 5, it does in .net 6

[davidfowl]

Can you show the entire project file and what code you're writing? That type did change completely in .NET 6 so you can't cross the streams with what versions you're using.

[Bellarmine-Head]

I wonder if NuGet offered you a 6.0.0 package update with a .NET 6.0 dependency for a .NET 5.0 project, like I was for Microsoft.AspNetCore.Components.WebAssembly: #38256

I was suspicious of this and didn't update.

Hi @ASP-WAF. We have added the "Needs: Author Feedback" label to this issue, which indicates that we have an open question for you before we can take further action. This issue will be closed automatically in 7 days if we do not hear back from you by then - please feel free to re-open it if you come back to this issue after that time.

[adityamandaleeka]

@ASP-WAF Please share your project file so we can help with this.

[halter73]

I am using IMultiplexedConnectionListenerFactory in my code, it will not work when using the new 6.0 version in .net 5, it does in .net 6

I think you're going to have to conditionally compile for net5.0 and net6.0 because IMultiplexedConnectionListenerFactory moved from the Microsoft.AspNetCore.Connections.Experimental to the Microsoft.AspNetCore.Connections namespace.

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