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HomeSoftware DevelopmentUpgrading a 20 yr outdated College Challenge to .NET 6 with dotnet-upgrade-assistant

Upgrading a 20 yr outdated College Challenge to .NET 6 with dotnet-upgrade-assistant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 school 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 At this level it was 15 years outdated, so it was cool to see this challenge operating on Home windows, Linux, in Docker, and on a Raspberry Pi…a machine that did not exist when the challenge was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 evening. It will definitely took 11 years to finish my BS in Software program Engineering.

This night, as the youngsters slept, I wished to see if I might run the .NET Improve Assistant on this now 20 yr outdated app and get it operating on .NET 6.

Let’s begin:

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

We're interested by your suggestions! Please use the next hyperlink to open a survey:

[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 challenge in resolution: C:UsersscottTinyOSsrcTinyOSCoreTinyOSCore.csproj
[22:58:07 INF] Recommending executable TFM net6.0 as a result of the challenge builds to an executable
[22:58:07 INF] Initializing improve step Choose challenge to improve
[22:58:07 INF] Recommending executable TFM net6.0 as a result of the challenge builds to an executable
[22:58:07 INF] Recommending executable TFM net6.0 as a result of the challenge builds to an executable
[22:58:07 INF] Initializing improve step Again up challenge

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

Updating .NET project with the upgrade assistant

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

After 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 mistaken, 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 notice a commented-out reference to ILLink.Duties which was a preview characteristic in Mono’s Linker to scale 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 through the construct and packaging course of later. The reference is just not wanted at the moment.

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I might do that by simply altering the numbers and seeing if it restores and builds, however I may also attempt dotnet outdated which stays a beautiful instrument within the upgrader’s toolkit.


This “outdated” instrument 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 trendy 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 might 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, appears to be like good. My challenge 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, guide, father, diabetic, and Microsoft worker. He’s a failed stand-up comedian, a cornrower, and a e-book creator.

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