Web Reference: Jan 16, 2026 · Custom method parameter attributes empower developers to define reusable, domain-specific validation logic. In this blog, we’ll walk through creating, applying, and validating custom parameter attributes in C#, with practical examples and advanced scenarios. For scenarios that the built-in validation attributes don't handle, you can create custom validation attributes. Create a class that inherits from ValidationAttribute, and override the IsValid method. I want to customize this error with my model. I need error message and details from return output and passed it to my model. How can I do that? I had try to debug my code and found that breakpoint on API method is not calling. So I can't handle my custom method.
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