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Friday, January 12, 2024

Upgrading a 20 yr previous College Challenge to .NET 6 with dotnet-upgrade-assistant

I wrote a Tiny Digital Working System for a 300-level OS class in C# for faculty again in 2001 (?) and later moved it to VB.NET in 2002. That is all pre-.NET Core, and on early .NET 1.1 or 2.0 on Home windows. I moved it to GitHub 5 years in the past and ported it to .NET Core 2.0 on the time. At this level it was 15 years previous, so it was cool to see this undertaking working on Home windows, Linux, in Docker, and on a Raspberry Pi…a machine that did not exist when the undertaking was initially written.

NOTE: If the timeline is complicated, I had already been working in business for years at this level however was nonetheless plugging away at my 4 yr diploma at night time. It will definitely took 11 years to finish my BS in Software program Engineering.

This night, as the kids slept, I wished to see if I may run the .NET Improve Assistant on this now 20 yr previous app and get it working on .NET 6.

Let’s begin:

$ upgrade-assistant improve .TinyOS.sln
Microsoft .NET Improve Assistant v0.3.256001+3c4e05c787f588e940fe73bfa78d7eedfe0190bd

We're all for your suggestions! Please use the next hyperlink to open a survey: https://aka.ms/DotNetUASurvey

[22:58:01 INF] Loaded 5 extensions
[22:58:02 INF] Utilizing MSBuild from C:Program Filesdotnetsdk6.0.100
[22:58:02 INF] Utilizing Visible Studio set up from C:Program FilesMicrosoft Visible Studio2022Preview [v17]
[22:58:06 INF] Initializing improve step Choose an entrypoint
[22:58:07 INF] Setting entrypoint to solely undertaking in resolution: C:UsersscottTinyOSsrcTinyOSCoreTinyOSCore.csproj
[22:58:07 INF] Recommending executable TFM net6.0 as a result of the undertaking builds to an executable
[22:58:07 INF] Initializing improve step Choose undertaking to improve
[22:58:07 INF] Recommending executable TFM net6.0 as a result of the undertaking builds to an executable
[22:58:07 INF] Recommending executable TFM net6.0 as a result of the undertaking builds to an executable
[22:58:07 INF] Initializing improve step Again up undertaking

See how the method is interactive on the command line, with coloration prompts and a collection of dynamic multiple-choice questions?

Updating .NET project with the upgrade assistant

Curiously, it builds on the primary attempt, no errors.

Once I manually have a look at the .csproj I can see some bizarre model numbers, seemingly from some not-quite-baked model of .NET Core 2 I used a few years in the past. My spidey sense says that is incorrect, and I am assuming the improve assistant did not perceive it.

    <!-- <PackageReference Embrace="ILLink.Duties" Model="0.1.4-preview-906439" /> -->
<PackageReference Embrace="Microsoft.Extensions.Configuration" Model="2.0.0-preview2-final" />
<PackageReference Embrace="Microsoft.Extensions.Configuration.Json" Model="2.0.0-preview2-final" />
<PackageReference Embrace="Microsoft.Extensions.DependencyInjection" Model="2.0.0-preview2-final" />
<PackageReference Embrace="Microsoft.Extensions.Choices.ConfigurationExtensions" Model="2.0.0-preview2-final" />

I additionally be aware a commented-out reference to ILLink.Duties which was a preview function in Mono’s Linker to cut back the ultimate dimension of apps and tree-trim them. A few of that performance is constructed into .NET 6 now so I will use that throughout the construct and packaging course of later. The reference is just not wanted immediately.

I am gonna blindly improve them to .NET 6 and see what occurs. I may do that by simply altering the numbers and seeing if it restores and builds, however I may attempt dotnet outdated which stays a beautiful device within the upgrader’s toolkit.


This “outdated” device is sweet because it talks to NuGet and confirms that there are newer variations of sure packages.

In my assessments – which have been simply batch recordsdata at this early time – I used to be calling my dotnet app like this:

dotnet netcoreapp2.0/TinyOSCore.dll 512 scott13.txt  

This may change to the fashionable kind with simply TinyOSCore.exe 512 scott13.txt with an exe and args and no ceremony.

Publishing and trimming my TinyOS turns into only a 15 meg EXE. Good contemplating that the .NET I would like is in there with no separate set up. I may flip this little artificial OS right into a microservice if I wished to be completely additional.

dotnet publish -r win-x64 --self-contained -p:PublishSingleFile=true -p:SuppressTrimAnalysisWarnings=true

If I add


Then it is even smaller. No code adjustments. Run all my assessments, seems to be good. My undertaking from college from .NET 1.1 is now .NET 6.0, cross platform, self-contained in 11 megs in a single EXE. Candy.

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About Scott

Scott Hanselman is a former professor, former Chief Architect in finance, now speaker, marketing consultant, father, diabetic, and Microsoft worker. He’s a failed stand-up comedian, a cornrower, and a guide writer.

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