dotnet-source-gen-options-validation

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

When to Use

• Preparing application for Native AOT compilation
• Eliminating reflection-based validation overhead
• Ensuring validation errors surface at compile time rather than runtime
• Migrating from ValidateDataAnnotations() to source-generated validation

Steps

1. 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

2. Check existing validation setup:

   • If class already has a corresponding [OptionsValidator] partial class, skip it
   • Note any existing ValidateDataAnnotations() calls for removal later