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Explain the ASP.NET Core hosting model (Host Builder + Kestrel + Startup flow).

Senior .NET Core
Quick Answer The Generic Host handles all .NET app types — web, worker, console, Windows service. Builder.Services registers dependencies; builder.Configuration reads config sources; builder.Logging adds log providers. Build() creates the host; Run() starts it. WebApplication (minimal API) wraps this in .NET 6+ with an even simpler API.

Answer

ASP.NET Core uses a unified Host that manages configuration, logging, DI, environment, and pipeline. The flow:

  • Host initializes runtime and services
  • Kestrel web server starts
  • Configuration sources load
  • Services added to DI
  • Middleware pipeline built
  • The app starts listening for HTTP requests

The unified model gives fine-grained control of every system layer.

S
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This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.

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