Tech
Upgrade .NET 8 to .NET 10 Without Breaking Your API Contract
If I need to upgrade .NET 8 to .NET 10 , I treat the work as an API contract migration, not a project-file edit. A service can compile, pass unit tests, and still surprise consumers with a changed JSON shape, status code, authentication response, or OpenAPI document.
That risk matters now because Microsoft has confirmed that .NET 8 and .NET 9 reach end of support on November 10, 2026 . .NET 10 and C# 14 are the current stable releases, and .NET 10 is the supported LTS destination.
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