microsoft-extensions-configuration

SKILL.md

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.

Key Point: .ValidateOnStart() is critical. Without it, validation only runs when the options are first accessed, which could be minutes or hours into application runtime.

Microsoft.Extensions.Options 模式包括 IValidateOptions、強類型設置、啟動時驗證以及用於乾淨配置管理的選項模式。 來源：aaronontheweb/dotnet-skills。

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