30 ASP.NET Core Interview Questions That Actually Get Asked in 2026
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A deep-dive into 30 ASP.NET Core internals interview questions covering the topics that actually come up in technical rounds: middleware pipeline ordering, DI lifetimes and captive dependencies, hosting and startup phases, configuration provider precedence, the Options pattern, filters vs middleware, model binding rules, HttpContext lifetime, BackgroundService patterns, and .NET 10-specific changes like built-in Minimal API validation and the cookie-auth 401-vs-redirect behavior change. Each question includes a model answer, a red-flag answer to avoid, and a follow-up the interviewer typically chains next.
Table of contents
What Makes a Good ASP.NET Core Internals Answer?Drill ASP.NET Core in the free mock interviewHosting, Startup, and the HostIHostedService vs BackgroundService in .NET 10The Middleware PipelineASP.NET Core Middleware in .NET 10Global Exception Handling in ASP.NET Core (.NET 10)Dependency Injection InternalsTransient vs Scoped vs Singleton in .NETDependency Injection in ASP.NET Core - The Complete .NET 10 GuideConfiguration and OptionsOptions Pattern in ASP.NET Core - IOptions vs Snapshot vs MonitorASP.NET Core Configuration - appsettings, Env Vars & User SecretsFilters and Model BindingASP.NET Core Filters in .NET 10 - All 6 Types & Execution OrderMinimal APIs in ASP.NET Core .NET 10 - Routing, Binding & ValidationFluentValidation in ASP.NET Core .NET 10 - Beyond Data AnnotationsRequest Lifecycle and Background WorkASP.NET Core Middleware in .NET 10JWT Authentication in ASP.NET Core - A Complete .NET 10 GuideIHostedService vs BackgroundService in .NET 10: Which to Use5 ASP.NET Core Interview Mistakes That Get Developers RejectedKey Takeaways.NET Interview Questions5.8K Impressions2 Comments