microsoft-extensions-configuration

Bind .NET configuration sections to POCOs with startup validation.

1.1k|101|Updated Nov 12, 2025

Search Tags:#validation #configuration #startup #IValidateOptions #named-options #IOptions #options-binding

Ready to run

npx skills add https://github.com/Aaronontheweb/dotnet-skills --skill microsoft-extensions-configuration

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: microsoft-extensions-configuration
Source: https://github.com/Aaronontheweb/dotnet-skills/tree/main/skills/microsoft-extensions-configuration
Command: npx skills add https://github.com/Aaronontheweb/dotnet-skills --skill microsoft-extensions-configuration

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This skill solves the problem of misconfigured .NET applications by enabling strongly-typed options and startup validation.

Core Features & Use Cases

Basic Options Binding: Bind configuration sections to POCOs for type-safe access.
Validation at Startup: Use Data Annotations and IValidateOptions for fail-fast validation.
Complex Rules & Cross-Property Validation: Implement advanced validators that consider multiple settings together.
Named Options & Post-Configuration: Support multiple named configurations and post-bind adjustments.

Quick Start

Define a settings POCO with a SectionName constant, register options in DI, bind configuration, and enable validation. Then inject IOptions<T> (or IOptionsSnapshot<T>) into your services to consume the validated settings.

Frequently Asked Questions about microsoft-extensions-configuration

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I validate .NET configuration at startup to prevent misconfigured applications?▼

You validate .NET configuration at startup by implementing IValidateOptions or applying Data Annotations to your settings POCO, registering validation in DI, and triggering a fail-fast check during host initialization.

How do I bind configuration sections to a POCO for strongly typed settings access?▼

Strongly typed configuration binding maps configuration sections to POCO settings classes. You register options in dependency injection and inject IOptions<T> or IOptionsSnapshot<T> into your services to consume the validated, type-safe settings.

Can I implement cross-property validation rules for complex .NET configuration scenarios?▼

Yes, you can implement complex cross-property validation by writing a custom IValidateOptions<T> class. This validator inspects multiple properties together, allowing you to enforce advanced rules that standard Data Annotations cannot handle individually.

How do named options work for handling multiple configurations in .NET?▼

Named options support multiple distinct configurations within a single application by keying settings during DI registration. You resolve specific configurations at runtime using IOptionsSnapshot<T> with the corresponding name.

Do I need Microsoft.Extensions.Options to use strongly typed configuration binding?▼

Yes, Microsoft.Extensions.Options is required for strongly typed configuration binding. You need a POCO settings class with a SectionName constant and a SKILL.md frontmatter-driven load sequence to operate the validation flow at startup.