ASP.NET Core Interview Question #44

What are configuration providers in ASP.NET Core?

Application Structure & Configuration Junior Beginner

Quick Interview Answer

Configuration providers are components that supply configuration key-value pairs to the ASP.NET Core configuration system.

Detailed Explanation

Configuration providers are components that supply configuration key-value pairs to the ASP.NET Core configuration system.

Built-in providers include JSON files, environment variables, command-line arguments, in-memory collections, user secrets, and other sources. Additional providers can be added for external systems.

Provider ordering matters. When multiple providers contain the same key, a provider added later normally has higher priority and overrides the earlier value. This makes it possible to define defaults in JSON and override them at deployment time.

Code Example

var builder = WebApplication.CreateBuilder(args);

builder.Configuration
    .AddJsonFile("customsettings.json", optional: true)
    .AddEnvironmentVariables(prefix: "MYAPP_");