microsoft-extensions-configuration

Validate appsettings.json at startup in .NET by binding configuration sections to strongly-typed classes and applying data annotations or custom IValidateOptions logic to fail-fast if settings are invalid.

IOptions provides singleton configuration values, IOptionsSnapshot retrieves scoped settings per request, and IOptionsMonitor detects configuration changes dynamically at runtime for real-time updates.

Bind strongly-typed settings from appsettings.json by mapping configuration sections to C# classes using the Microsoft.Extensions.Options pattern, ensuring reliable and typed access to application settings.

Implement custom validation logic for .NET configuration by creating an IValidateOptions<T> implementation, allowing complex rules beyond standard data annotations to ensure configuration integrity.

Fail-fast validation for .NET configuration management catches missing or malformed settings like database connection strings at startup, preventing unexpected runtime failures in production environments.

Dependency injection integrates with the options pattern in .NET by registering strongly-typed configuration classes in the service container, allowing IOptions, IOptionsSnapshot, or IOptionsMonitor to be injected directly.