dotnet-source-gen-options-validation Skill

Convert options validation to use the compile-time source generator, enabling AOT-compatible, reflection-free validation at startup.

Find options classes with data annotations:
- Search for classes using [Required], [Range], [RegularExpression], [MaxLength], [MinLength], [Length]
- These are typically in files matching *Options.cs or *Settings.cs
Check existing validation setup:
- If class already has a corresponding [OptionsValidator] partial class, skip it
- Note any existing ValidateDataAnnotations() calls for removal later
For each options class, create a partial validator class:
```
[OptionsValidator]
public partial class Validate{OptionsClassName} : IValidateOptions<{OptionsClassName}>
{
}
```
- Place the validator in the same namespace as the options class
- The source generator will implement the validation logic at compile time
Register the validator in DI:
```
services.AddSingleton<IValidateOptions<MyOptions>, ValidateMyOptions>();
```
- Replace any existing ValidateDataAnnotations() calls
- Ensure Microsoft.Extensions.Options using directive is present
Verify with build:
```
dotnet build
```
If build fails, check for:
- Missing partial keyword on validator class
- Unsupported validation attributes
- Missing package reference to Microsoft.Extensions.Options
Report results:
- List all validator classes created
- List all DI registrations added
- Confirm build status

Agent Skills: dotnet-source-gen-options-validation