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by flamtap 2054 days ago
>I expect our migration from 3.1=>5.0 will be a total non-event, but we don't want to risk any regressions during our current crunch phase

FWIW, I just did a find/replace across 66 projects for `netcoreapp3.1` => `net5.0` and it build and passed tests first try. There were a fair few new nullable reference type warnings though!
1 comments
dazbradbury 2054 days ago
"Our migration from 4.7=>2.0 was the most difficult"

Would love to see a write up of your challenges / approach. Seems to be a big lack of write ups on this process that I'm sure lots of devs would appreciate!

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bob1029 2054 days ago
I can give you a 500 word abstract here.

The core challenge was dealing with 3rd party dependencies (Nugets) relative to each project. We ultimately found that attempting to mix Framework/Core/Standard projects together was an excellent substitute for nightmare fuel. So, the happy path for us turned out to be to do it all at once and only use .NET Core project types throughout (DLL/EXE). Trying to convert your overall solution 1 project at a time hoping for some sort of incremental outcome is probably going to be more frustration than it's worth.

Assuming you bite the bullet on all or nothing, the next challenge will be: Is your code is even supported anymore? This is obviously going to vary wildly depending on your use cases. For us, the Microsoft.Windows.Compatibility shim was enough to restore 100% of the functionality (we rely on System.Drawing and DirectoryServices). But, there was also a lot of other rewrite to support new AspNetCore primitives, and we also moved over to Blazor for web UI (which is more of a rewrite than migration).

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dazbradbury 2053 days ago
Thanks!
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mjsabby 2054 days ago
My team did this when we moved Bing.com over to .NET Core, but it's internal. I will see if we can make it public. The problem is there are some skeletons in the closest that are irrelevant now (some since NS2.0, more since netcoreapp3.1), so I wonder how informative it will be.
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dazbradbury 2053 days ago
Would love to read about that, even if some parts are now already outdated or no longer as big am obstacle.

A site as large / complex as I assume bing is would possibly allay lots of our concerns and give us some concrete steps to move forward with.

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