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

Mid .NET Core
Quick Answer WebApplication.CreateBuilder() sets up the Generic Host. Builder.Services adds DI registrations. builder.Build() creates the WebApplication. Then middleware is added (app.UseAuthentication(), app.MapControllers(), etc.). app.Run() starts Kestrel listening. In .NET 6+ this is all in Program.cs — no Startup.cs required.

Answer

The hosting model uses a unified Host that configures DI, logging, configuration, server startup, environment settings, and middleware pipeline creation. It initializes Kestrel, loads configuration, builds services, and finally runs the HTTP pipeline.

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