SignalR version 9.0.4 not working in .NET 8

[wbunthof]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

In the nuget page of 9.0.4, states that it has support for net8.0

However with the following project file

<Project Sdk="Microsoft.NET.Sdk.Web">
	<PropertyGroup>
		<TargetFramework>net8.0</TargetFramework>
		<Nullable>enable</Nullable>
		<ImplicitUsings>enable</ImplicitUsings>
	</PropertyGroup>
	<ItemGroup>
		<PackageReference Include="Blazor-ApexCharts" Version="5.1.0" />
		<PackageReference Include="HtmlAgilityPack" Version="1.11.72" />
		<PackageReference Include="Markdig" Version="0.40.0" />
		<PackageReference Include="MermaidDiagrams" Version="0.3.5" />
		<PackageReference Include="Microsoft.AspNetCore.SignalR.Client" Version="9.0.4" />
		<PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.12.0" />
		<PackageReference Include="Serilog.AspNetCore" Version="9.0.0" />
		<PackageReference Include="Svg" Version="3.4.7" />
	</ItemGroup>
</Project>

It results in the following mulltiple of the following exception.
Method not found: 'System.String Microsoft.AspNetCore.SignalR.IInvocationBinder.GetTarget(System.ReadOnlySpan`1)'.

When I go back to version 8.0.15
This exception isn't thrown, and the web application properly works.

Expected Behavior

Showing a proper rendered page, instead of a render failure.

Steps To Reproduce

Not yet complete - Can't repodruce from new blazor application

• Create a .NET 8 Asp.Net project.
• Install 'Microsoft.AspNetCore.SignalR.Client' version '9.0.4'
• Run

Exceptions (if any)

Method not found: 'System.String Microsoft.AspNetCore.SignalR.IInvocationBinder.GetTarget(System.ReadOnlySpan`1)'.

.NET Version

.NET 8
Microsoft.AspNetCore.SignalR.Client - 9.0.4

Anything else?

Does anybody have an idea why this is occurring at the project I'm working on, but not on a new clean project.

[martincostello]

It doesn't support net8.0, but NuGet is implying it does because net9.0 is a superset of it. That's why net9.0 is highlighted and net8.0 isn't.

The exception is caused by use of APIs that were added to the framework in .NET 9.0 that are absent in .NET 8.

You should use the latest 8.0.x package with an ASP.NET Core 8.0 application.

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