Pimp Your Parameters: The Magic of Validation Classes
summary
Creates reusable classes that derive from ValidateArgumentsAttribute and implement a Validate(object arguments, EngineIntrinsics) method that throws on invalid and returns void, so bad input is rejected before function body runs. Demos include a ValidateIsNotFriday rule, a Jira ticket regex, a semver checker that strips leading v, enforces three parts, disallows components >999, a path validator that blocks UNC and “..” traversal and can restrict to a root, and a port validator that blocks well‑known ports by default. Note order matters — only first failure is reported and these work in PowerShell 5 where semver types are absent.
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chapters (10)
- 0:00Validation classes intro
- 1:15Built-in validation recap
- 2:18Why custom validation matters
- 4:47Custom validation class
- 7:13Custom validation examples
- 10:46Constructors for validation
- 14:55Advanced validation scenarios
- 18:29Port and path validation
- 20:15Key takeaways
- 24:53Q&A
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