dotnet-csharp-configuration

Configuration patterns for .NET applications using Microsoft.Extensions.Configuration and Microsoft.Extensions.Options. Covers the Options pattern (IOptions<T>, IOptionsMonitor<T>, IOptionsSnapshot<T>), validation, user secrets, environment-based configuration, and feature flags with Microsoft.FeatureManagement.

Cross-references: [skill:dotnet-csharp-dependency-injection] for service registration patterns, [skill:dotnet-csharp-coding-standards] for naming conventions.

Configuration Sources and Precedence

Default configuration sources in WebApplication.CreateBuilder (last wins):

1. appsettings.json
2. appsettings.{Environment}.json
3. User secrets (Development only)
4. Environment variables
5. Command-line arguments