ASP.NET Core Null Responses and Model Binding: Build a Testable API Contract
Explain how ASP.NET Core handles raw null, empty arrays, JsonResult, and unknown JSON members, with a reproducible .NET 9 sandbox test.
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ASP.NET Core DI Container Pitfalls: Avoid BuildServiceProvider and Lifetime Mismatches
Learn why BuildServiceProvider creates a second ASP.NET Core DI container, how scoped and singleton lifetimes fail, and how to verify fixes on .NET 9.