Which SignalR package to install for a .NET 6 server project?

Question

I have a NET6 project which is built part of a larger .NET 6 ASP.NET solution. The project still references:

Microsoft.AspNetCore.SignalR, and
Microsoft.AspNetCore.SignalR.Core

Which have now been marked as deprecated.

What packages do I need to install for their replacement?

The problem is that currently SignalR is located in an assembly separate from the main ASP.NET project. This is because the main project and a couple of other projects within the solution use the hubs (using constructor DI).

If I change the SignalR project to

<Project Sdk="Microsoft.NET.Sdk.Web">
    ...
</Project>

I get the following compilation error:

Error CS5001 Program does not contain a static 'Main' method suitable for an entry point

So the problem is that I cannot have a common assembly with SignalR referenced by multiple other projects.

You could check out this - nuget.org/packages/Microsoft.AspNetCore.SignalR.Core. Here it says that Microsoft.AspNetCore.SignalR.Core is deprecated. — AchoVasilev
– AchoVasilev, Commented Jun 23, 2022 at 18:40

Guru Stron · Accepted Answer · 2022-07-18 11:45:53Z

24

SignalR is included in the Microsoft.AspNetCore.App shared framework (docs). Change the console app SDK to Microsoft.NET.Sdk.Web:

<Project Sdk="Microsoft.NET.Sdk.Web">
   ...
</Project>

To use the ASP.NET Core shared framework in a class library project - add FrameworkReference element for Microsoft.AspNetCore.App:

<ItemGroup>
    <FrameworkReference Include="Microsoft.AspNetCore.App" />
</ItemGroup>

edited Jul 18, 2022 at 11:45

answered Jun 23, 2022 at 20:59

Guru Stron

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7 Comments

Ivan-Mark Debono Over a year ago

This works only if the project is the main one. I have SignalR in a separate project in which I define my hubs and is reference in the main ASP.NET project and other projects within the solution.

Guru Stron Over a year ago

@Ivan-MarkDebono "This works only if the project is the main one" - can you please elaborate? You can't change the separate project to target web sdk?

Ivan-Mark Debono Over a year ago

Doing so requires that the project has a static 'Main' method.

Guru Stron Over a year ago

@Ivan-MarkDebono see the update.

rism Over a year ago

@Ivan-MarkDebono Can also just change the output type in the project file: <OutputType>Library</OutputType>. The reason it requires a Main method is because by default it will be <OutputType>Exe</OutputType>

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