Upgrade .NET 8 to .NET 10 Without Breaking API Contracts
EDITOR BRIEF
The article treats a .NET 8 to .NET 10 upgrade as an API contract migration, since code can still compile and tests can pass while external behavior changes. It recommends inventorying projects, SDK pins, base images, and package references, then splitting the work into SDK/target framework, NuGet dependencies, and runtime infrastructure. Before switching to net10.0, it adds contract tests for observable behavior like status codes, JSON field names, and auth boundaries.
INSIGHTS
For learners, this shows that upgrading frameworks is also about protecting how your app behaves for users. A good next step is to write one contract test for a key endpoint before changing the target framework.
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