Updating an existing .NET Framework project into a .NET Core one

[Ramoon_Bandeira]

Now that Revit 2025 is out, Naturally, most developers will need to upgrade their existent .Net Framework Projects into .NET Core 8.0 project.

Is there a step by step guide to update an existing .NET Framework 4.8 project into a .NET core 8.0 ?
I`ve been attempting to use microsoft upgrade feature but all attempts of my part have failed miserably so far.

Thanks.

[nice3point]

This is a NuGet restore issue: https://github.com/dotnet/project-system/issues/3164

If you are using Nuke, please clean obj folder before compilation

https://github.com/jeremytammik/RevitLookup/blob/dev/build/Build.Clean.cs#L14

And if you're using a different batch build, write more details

[Extraneous]

@nice3point I use the standard Visual studio's Batch build:

[retug_austin]

I am about to go through the upgrade process myself, thank you to everyone in this thread, the information is very valuable. Do people have a preference on one vs two cs.proj's solution as @kevinaugustino mentioned (pre 2025 and  2025 and beyond)?

@kevinaugustino , Do you like your setup? I would assume that you have to maintain two code basis now, if you make an update to one cs.proj you have to do the same for the other?

[eN27]

A separate folder is mandatory, there is no backward compatibility, net 8.0 (revit 2025) dlls can not be used with net 4.8 (revit  2024).

[SwainStrain]

Thank you. I resolved the issue by inserting these two property groups in the project file::

    <PropertyGroup Condition="'$(Configuration)' == '2024Debug'">
        <RevitVersion>2024</RevitVersion>
        <TargetFramework>net48</TargetFramework>
    </PropertyGroup>
    <PropertyGroup Condition="'$(Configuration)' == '2025Debug'">
        <RevitVersion>2025</RevitVersion>
        <TargetFramework>net8.0-windows</TargetFramework>
    </PropertyGroup>

[SerhanB]

Batch build is broken so I use a batch file containing follows:

msbuild .\revitadd-in.sln -p:Configuration=R2025 -p:Platform=x64 -t:rebuild -restore -p:RestorePackagesConfig=true -v:m
msbuild .\revitadd-in.sln -p:Configuration=R2024 -p:Platform=x64 -t:rebuild -restore -p:RestorePackagesConfig=true -v:m
msbuild .\revitadd-in.sln -p:Configuration=Debug -p:Platform=x64 -t:rebuild -restore -p:RestorePackagesConfig=true -v:m
msbuild .\revitadd-in.sln -p:Configuration=Release -p:Platform=x64 -t:rebuild -restore -p:RestorePackagesConfig=true -v:m