[release/10.0] Fix minimal API validation for record structs #64517
+370
−4
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Backport of #64514 to release/10.0
/cc @captainsafia @copilot
Description
This backport updates the minimal API runtime validation logic to correctly treat user-defined value types—including
record structparameters and nested properties—as complex types. Previously, the validation pipeline only considered classes complex, causing record structs without top-level validation attributes to be skipped entirely.Fixes #64513
Customer Impact
Minimal API users defining request DTOs as
record structwere unable to rely on validation attributes inside those types. This led to missing validation errors and inconsistent behavior between classes and record structs. The fix brings record struct behavior in line with classes and improves model consistency without requiring user code changes.Regression?
Risk
The change expands the definition of “complex type” to include non-primitive value types. This aligns with user expectations and matches typical model binding behavior. Existing special-cased primitive and framework types remain excluded, and new automated tests cover the updated behavior.
Verification
Packaging changes reviewed?