microsoft-extensions-configuration
Microsoft.Extensions Configuration Patterns
When to Use This Skill
Use this skill when:
- Binding configuration from appsettings.json to strongly-typed classes
- Validating configuration at application startup (fail fast)
- Implementing complex validation logic for settings
- Designing configuration classes that are testable and maintainable
- Understanding IOptions, IOptionsSnapshot, and IOptionsMonitor
Why Configuration Validation Matters
The Problem: Applications often fail at runtime due to misconfiguration - missing connection strings, invalid URLs, out-of-range values. These failures happen deep in business logic, far from where configuration is loaded, making debugging difficult.
The Solution: Validate configuration at startup. If configuration is invalid, the application fails immediately with a clear error message. This is the "fail fast" principle.
// BAD: Fails at runtime when someone tries to use the service
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